Summary
Plan status as of 2026-09-30: Approved, expires 2029-06-30. Plan: U.S. Virgin Islands state-level plan (plan 109955), approved 2024-07-01.
Since the plan was approved on 2024-07-01: 2 new hazard declarations (1 incident): EM-3611-VI (Tropical Storm Ernesto), DR-4841-VI (Tropical Storm Ernesto).
NOAA Storm Events records since that date: 1 record (data through 2026-06-30).
Highest expected annual loss (FEMA National Risk Index, modeled total; see B1-a): Hurricane ($5,423,596 a year), Earthquake ($825,116) and Inland Flooding ($385,830).
Repetitive-loss flood properties now: FMA RL 0, SRL 0 (44 CFR 77.2); any definition: 2.
The tables that follow are organized by the items of FEMA's Local Mitigation Plan Review Tool, Element B (B1-a to B2-c); each heading says which item its tables support.
Plan clock
- Status:
- Approved, expires 2029-06-30
- Plan:
- U.S. Virgin Islands state-level plan (plan 109955)
- Approved:
- 2024-07-01
- Days to expiry:
- 1,004
Plan clock from the U.S. Virgin Islands state-level plan; FEMA plan data has no county-level or local plan row for this area.
What changed since your last plan (approved 2024-07-01)
- New federal declarations:
- 2 new hazard declarations (1 incident): EM-3611-VI (Tropical Storm Ernesto), DR-4841-VI (Tropical Storm Ernesto)
- Storm Events records since approval:
- 1 record (data through 2026-06-30)
- Repetitive loss now:
- FMA RL 0, SRL 0 (44 CFR 77.2); any definition: 2
- Repeat-flood change:
- this release sets the baseline count.
Sources: 1, 2, 4, 6 (numbered list at the end)
Plan status for every jurisdiction listed in this county
Source: 1
| Jurisdiction | Type | Status | Plan | Approved | Expires | Days to expirynegative = days since expiry | Update underway | Notes |
|---|---|---|---|---|---|---|---|---|
| No rows for this unit. | ||||||||
No jurisdictions listed in FEMA plan data for this unit.
Plan 109955 covers 1 other participant: Virgin Islands.
State plan status and tribal plans in this state: see the state page.
Supports FEMA checklist item B1-a: hazard identification
Hazards NRI does not cover (local data needed)
- dam failure (incl. upstream dams)
- levee failure
- flash flood as its own subtype
- ice jams
- debris flows
- erosion (riverine and coastal)
- land subsidence and sinkholes
- expansive soils
The 18 National Risk Index hazards, ranked by expected annual loss (EAL)
Sources: 5, 6
| Rank by EAL | Hazard | NRI risk rating | EAL rating | EAL buildingsmodeled dollars per year | EAL agriculturemodeled dollars per year | Cost of expected deaths and injuriesFEMA's dollar value per year, not property damage | EAL total (see note)modeled dollars per year | Storm Events records, 1996 to 2026-06-30count | Storm Events coverage note |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Hurricane | Insufficient Data | Relatively Moderate | $5,270,219 | $0 | $153,377 | $5,423,596 | 15 | Includes 1 Tropical Depression record (outside NRI's Hurricane definition). |
| 2 | Earthquake | Insufficient Data | Relatively Low | $703,745 | n/a | $121,371 | $825,116 | Storm Events does not record earthquakes. | |
| 3 | Inland Flooding | Insufficient Data | Very Low | $384,438 | $0 | $1,392 | $385,830 | 11 | |
| 4 | Tsunami | Insufficient Data | Very Low | $70,188 | n/a | $0 | $70,188 | 0 | No recorded events in Storm Events since 1996 (data through 2026-06-30). |
| 5 | Coastal Flooding | Insufficient Data | Very Low | $12,302 | n/a | $204 | $12,506 | 2 | |
| 6 | Tornado | Insufficient Data | Very Low | $359 | $0 | $175 | $534 | 0 | No recorded events in Storm Events since 1996 (data through 2026-06-30). |
| 7 | Volcanic Activity | Insufficient Data | Very Low | $1 | n/a | $93 | $93 | 5 | |
| 8 | Hail | Insufficient Data | Very Low | $41 | $0 | $3 | $44 | 0 | No recorded events in Storm Events since 1996 (data through 2026-06-30). |
| 9 | Strong Wind | Insufficient Data | Very Low | $10 | $0 | $3 | $13 | 5 | Includes 2 Strong Wind records (a NOAA non-thunderstorm wind type, outside NRI's Strong Wind definition). |
| 10 | Cold Wave | Insufficient Data | No Expected Annual Losses | $0 | $0 | $0 | $0 | 0 | No recorded events in Storm Events since 1996 (data through 2026-06-30). |
| 11 | Drought | Insufficient Data | No Expected Annual Losses | n/a | $0 | n/a | $0 | 13 | |
| 12 | Heat Wave | Insufficient Data | No Expected Annual Losses | $0 | $0 | $0 | $0 | 2 | |
| 13 | Winter Weather | Insufficient Data | No Expected Annual Losses | $0 | $0 | $0 | $0 | 0 | No recorded events in Storm Events since 1996 (data through 2026-06-30). |
| Landslide | Insufficient Data | Insufficient Data | n/a | n/a | n/a | n/a | 0 | Declared 5 times; no Storm Events record of this type. | |
| Lightning | Insufficient Data | Insufficient Data | n/a | n/a | n/a | n/a | 0 | No recorded events in Storm Events since 1996 (data through 2026-06-30). | |
| Wildfire | Insufficient Data | Insufficient Data | n/a | n/a | n/a | n/a | 0 | No recorded events in Storm Events since 1996 (data through 2026-06-30). |
Total = buildings + agriculture + population equivalence; FEMA values each expected death (or 10 injuries) at $13.7 million (2024 dollars).
NRI risk rating combines expected annual loss with social vulnerability and community resilience; EAL rating rates expected annual loss alone. Both compare this county with all U.S. counties.
Local data needed: state and local tsunami, tornado, hail, cold wave, winter weather, landslide, lightning and wildfire records (Storm Events records these hazards only in part).
Not applicable to this county per NRI, with no federal declaration and no Storm Events record since 1996: avalanche and ice storm. That is the evidence for leaving them out of the plan.
The state hazard mitigation plan also lists hazards for this county; FEMA asks the plan to explain any hazard it leaves out.
Supports FEMA checklist item B1-b: hazard location
Affects the whole county (national data give no location within it): Cold Wave, Drought, Hail, Heat Wave, Lightning, Strong Wind and Winter Weather.
Coastal Flooding and Inland Flooding: The FEMA Flood Insurance Rate Map (FIRM) is the required location source for flooding. See the FEMA Flood Map Service Center (https://msc.fema.gov) for this county.
Hazards that vary within the county: highest-rated census tracts
Source: 5
| Hazard | Highest-rated census tractsNRI risk rating, score 0 to 100 |
|---|---|
| Earthquake | no tract has a National Risk Index rating for this hazard |
| Hurricane | no tract has a National Risk Index rating for this hazard |
| Landslide | no tract has a National Risk Index rating for this hazard |
| Tornado | no tract has a National Risk Index rating for this hazard |
| Tsunami | no tract has a National Risk Index rating for this hazard |
| Volcanic Activity | no tract has a National Risk Index rating for this hazard |
| Wildfire | no tract has a National Risk Index rating for this hazard |
Up to 3 census tracts per hazard, highest National Risk Index rating first, then highest score; a tract number is the Census tract number. FEMA's Resilience Analysis and Planning Tool maps the National Risk Index for every tract: https://www.fema.gov/emergency-managers/practitioners/resilience-analysis-and-planning-tool
Supports FEMA checklist item B1-c: hazard extent
Extent: scale, observed range and worst recorded event per hazard
Sources: 6, 7
| Hazard | Scale | Recordscount and years | Observed range | Worst recorded event | Most damaging (when different) | How it applies to jurisdictions | Note |
|---|---|---|---|---|---|---|---|
| Coastal Flood, Storm Surge/Tide | none in data (flood depth: FIRM) | 2 records, 2022 to 2024 (2 zone-level) | No damage reported in 2 records. | Countywide (zone-level records). | Flood depth: see the FEMA Flood Insurance Rate Map. | ||
| Cold/Wind Chill, Extreme Cold/Wind Chill | wind chill | 0 | Wind chill: in event narratives only (local data needed). | ||||
| Frost/Freeze (outside NRI's Cold Wave definition) | crop damage | 0 | Temperature: in event narratives only (local data needed). | ||||
| Drought | U.S. Drought Monitor scale (D0 to D4) | 13 records, 1997 to 2024 (13 zone-level) | 31 days to 166 days (median 87 days); 4 with a recorded value | 166 days (about 5.5 months), 2023-09-01 to 2024-02-13, a run of 6 consecutive Storm Events drought records, zone-level | Countywide (zone-level records). | Storm Events enters a drought at D2 or worse east of the Rockies and D3 or worse from the Rockies west (NWS Instruction 10-1605); NRI drought counts D3 and D4 only. | |
| Earthquake | Modified Mercalli (local data) | 0 | Storm Events does not record earthquakes; the USGS earthquake catalog is the source. | ||||
| Hail | hail size (inches) | 0 | |||||
| Excessive Heat, Heat | heat index (in event narratives) | 2 records, 2023 to 2024 (2 zone-level) | 1 day to 30 days (median 15.5 days); 2 with a recorded value | September 2023 (1 monthly summary record), zone-level | Countywide (zone-level records). | Heat index: in event narratives only (local data needed). | |
| Hurricane, Tropical Storm, Tropical Depression | Saffir-Simpson | 15 records, 1997 to 2021 (15 zone-level) | Strongest recorded: Hurricane (Typhoon) record (NOAA's event type name), 2000-08-22, $100,000 property; crops not reported (2000 dollars); NWS zone VIZ001 | Most damaging recorded: Tropical Storm, 2004-09-14, $2,400,000 property; crops not reported, reported for the zone (2004 dollars) | Countywide (zone-level records). | Storm Events files every zone of a storm's episode under the storm's type; flooding from the storm is filed as Flood or Flash Flood records. | |
| Flash Flood, Flood, Lakeshore Flood | damage and flood days (flood depth: FIRM) | 11 records, 1999 to 2018 (2 zone-level) | Flood, 2003-11-11, $500,000 property; crops not reported (2003 dollars); NWS zone VIZ001 | No event record names a jurisdiction in the plan. Zone-level records (2) apply countywide. | Flood depth: see the FEMA Flood Insurance Rate Map. Storm Events damage is often $0 or blank for floods, major ones included; FEMA Public Assistance by declaration (B1-d) shows which floods cost the most. | ||
| Debris Flow | none (count and damage only) | 0 | Physical measure: in event narratives only (local data needed). | ||||
| Lightning | annualized frequency (the measure FEMA's Local Mitigation Planning Handbook names) | 0 | Storm Events lists lightning with damage or casualties; physical measure in event narratives only (local data needed). | ||||
| High Wind and Strong Wind (outside NRI's Strong Wind definition) | wind speed (kt and mph) | 2 records, 2007 to 2010 (2 zone-level) | 42 kt (48 mph) to 46 kt (53 mph) (median 44 kt (51 mph)); 2 with a recorded value | 46 kt (53 mph) measured gust, Strong Wind, 2010-08-30; NWS zone VIZ001 | Countywide (zone-level records). | ||
| Thunderstorm Wind | wind speed (kt and mph) | 3 records, 1998 to 2011 (1 zone-level) | 41 kt (47 mph); 1 with a recorded value | 41 kt (47 mph) measured gust, Thunderstorm Wind, 2011-07-01 | Thunderstorm Wind, 2002-09-16, $10,000 property; crops not reported, reported for the zone (2002 dollars) | No event record names a jurisdiction in the plan. Zone-level records (1) apply countywide. | |
| Tornado | Enhanced Fujita (Fujita before Feb 2007) | 0 | Before 1996 a tornado is listed once, under the county where it began, with its whole path's rating and length; from 1996 on, each county lists its own segment. Length is not used to rank tornadoes (see Methods). | ||||
| Tsunami | none (count and damage only) | 0 | Physical measure: in event narratives only (local data needed). | ||||
| Volcanic Ash, Volcanic Ashfall | Volcanic Explosivity Index (local data) | 5 records, 2001 to 2008 (5 zone-level) | Volcanic Ash, 2001-07-29, $100,000 property; crops not reported (2001 dollars); NWS zone VIZ001 | Countywide (zone-level records). | Physical measure: in event narratives only (local data needed). | ||
| Wildfire | acres burned (local data) | 0 | Acres burned: in event narratives only (local data needed). | ||||
| Winter Storm, Heavy Snow, Blizzard, Lake-Effect Snow, Winter Weather, Sleet | none in data (snowfall: local data) | 0 | Snow depth: in event narratives only (local data needed). |
Storm Events records are more complete after 1996; before 1996 only Tornado (from 1950), Hail and Thunderstorm Wind (from 1955) exist. Zone-level records whose zone no NWS zone-county file places in this county (mostly before 2020) are not counted here (the Methods page explains the zone matching).
Dollars are nominal (as reported), labeled with the year; not adjusted for inflation.
A monthly summary record covers most or all of a month; it does not count days at wave conditions.
Supports FEMA checklist item B1-d: previous occurrences
Federal declarations for this county: 27 declarations covering 21 separate hazard incidents counted in this packet (declarations for the same incident count once; non-natural and evacuation-only declarations are not counted).
Federal disaster declarations for this county
Sources: 1, 2, 3
| Declared | Incident began | FEMA number | Type | Title | Mapped hazard | County Public Assistancefederal share obligated, nominal dollars | Flags | Notes |
|---|---|---|---|---|---|---|---|---|
| 2024-10-25 | 2024-08-13 | DR-4841-VI | Major disaster | Tropical Storm Ernesto | Hurricane | no Public Assistance recorded | new since last plan; within last 5 years | |
| 2024-08-18 | 2024-08-13 | EM-3611-VI | Emergency | Tropical Storm Ernesto | Hurricane (primary); also designated: Landslide | no Public Assistance recorded | new since last plan; within last 5 years | same incident as DR-4841 |
| 2020-07-29 | 2020-07-27 | EM-3531-VI | Emergency | Potential Tropical Cyclone Nine | Hurricane | no Public Assistance recorded | ||
| 2020-04-02 | 2020-01-20 | DR-4513-VI | Major disaster | COVID-19 Pandemic | Non-natural, not counted | no Public Assistance recorded | ||
| 2020-03-13 | 2020-01-20 | EM-3433-VI | Emergency | COVID-19 | Non-natural, not counted | no Public Assistance recorded | same incident as DR-4513 | |
| 2019-08-28 | 2019-08-26 | EM-3418-VI | Emergency | Hurricane Dorian | Hurricane | no Public Assistance recorded | ||
| 2017-09-20 | 2017-09-16 | DR-4340-VI | Major disaster | Hurricane Maria | Hurricane | $21,726.87 | ||
| 2017-09-18 | 2017-09-16 | EM-3390-VI | Emergency | Hurricane Maria | Hurricane | no Public Assistance recorded | same incident as DR-4340 | |
| 2017-09-07 | 2017-09-05 | DR-4335-VI | Major disaster | Hurricane Irma | Hurricane | $8,885.08 | ||
| 2017-09-05 | 2017-09-05 | EM-3383-VI | Emergency | Hurricane Irma | Hurricane | no Public Assistance recorded | same incident as DR-4335 | |
| 2010-11-05 | 2010-10-01 | DR-1948-VI | Major disaster | Severe Storms, Flooding, Mudslides, and Landslides | Inland Flooding; Landslide | no Public Assistance recorded | ||
| 2010-09-28 | 2010-08-29 | DR-1939-VI | Major disaster | Hurricane Earl | Hurricane | no Public Assistance recorded | ||
| 2008-10-29 | 2008-10-14 | DR-1807-VI | Major disaster | Hurricane Omar | Hurricane | no Public Assistance recorded | ||
| 2004-10-07 | 2004-09-14 | DR-1567-VI | Major disaster | Tropical Storm Jeanne | Hurricane | no Public Assistance recorded | ||
| 2003-12-09 | 2003-11-10 | DR-1503-VI | Major disaster | Severe Storms, Flooding, Landslides, and Mudslides | Inland Flooding; Landslide | no Public Assistance recorded | ||
| 1999-11-23 | 1999-11-17 | DR-1309-VI | Major disaster | Hurricane Lenny Major Declaration | Hurricane | no Public Assistance recorded | ||
| 1999-11-17 | 1999-11-17 | EM-3152-VI | Emergency | Hurricane Lenny | Hurricane | no Public Assistance recorded | same incident as DR-1309 | |
| 1998-09-24 | 1998-09-19 | DR-1248-VI | Major disaster | Hurricane Georges - 18 Sep 98 | Hurricane | no Public Assistance recorded | ||
| 1996-07-11 | 1996-07-08 | DR-1126-VI | Major disaster | Hurricane Bertha | Hurricane | no Public Assistance recorded | ||
| 1995-09-16 | 1995-09-15 | DR-1067-VI | Major disaster | Hurricane Marilyn | Hurricane | no Public Assistance recorded | ||
| 1989-09-20 | 1989-09-17 | DR-841-VI | Major disaster | Hurricane Hugo | Hurricane | no Public Assistance recorded | ||
| 1984-12-10 | 1984-11-05 | DR-729-VI | Major disaster | Tropical Storm Klaus | Hurricane | no Public Assistance recorded | ||
| 1983-04-30 | 1983-04-30 | DR-681-VI | Major disaster | Severe Storms, Flooding & Mudslides | Inland Flooding (primary); also designated: Landslide | no Public Assistance recorded | ||
| 1979-09-16 | 1979-09-16 | DR-602-VI | Major disaster | Hurricane David, Tropical Storm Frederic | Hurricane | no Public Assistance recorded | ||
| 1977-06-14 | 1977-06-14 | EM-3042-VI | Emergency | Drought | Drought | no Public Assistance recorded | ||
| 1974-11-14 | 1974-11-14 | DR-451-VI | Major disaster | Severe Storms, Landslides & Flooding | Inland Flooding (primary); also designated: Landslide | no Public Assistance recorded | ||
| 1970-10-17 | 1970-10-17 | DR-298-VI | Major disaster | Heavy Rains & Flooding | Inland Flooding | no Public Assistance recorded |
County Public Assistance: applicants the FEMA record places in this county, including any state agencies FEMA files there; statewide rows are listed on the state page; federal share obligated, nominal dollars.
Statewide declarations
Source: 2
| Declared | Incident began | FEMA number | Type | Title | Mapped hazard |
|---|---|---|---|---|---|
| 1998-09-21 | 1998-09-21 | EM-3129-VI | Emergency | Hurricane Georges (Direct Federal Assist First 72 Hrs) | Hurricane |
| 1964-06-08 | 1964-06-08 | DR-171-VI | Major disaster | Extreme Drought Conditions | Drought |
FEMA recorded these with designated area Statewide and no county, so they are listed on every county page in the state and not counted with county rows. Local data needed: whether each one affected this county.
Previous occurrences by hazard, with explicit no-event rows
Sources: 2, 6, 7
| Hazard | Storm Events records, all years on file(years in the Period column) | Since plan approvalrecords | In the 12 months before plan approvalrecords | Last 5 yearsrecords | Declared incidents, all yearsseparate disasters | Declared since approvalseparate disasters | Period | Statement |
|---|---|---|---|---|---|---|---|---|
| Coastal Flooding | 2 | 0 | 1 | 2 | 0 | 0 | 1996 to 2026-06-30 | |
| Cold Wave | 0 | 0 | 0 | 0 | 0 | 0 | 1996 to 2026-06-30 | No recorded events, 1996 to 2026-06-30, NOAA NCEI Storm Events |
| Drought | 13 | 0 | 7 | 12 | 1 | 0 | 1996 to 2026-06-30 | |
| Earthquake | 0 | 0 | 0 | 0 | 0 | 0 | Storm Events does not record earthquakes; the USGS earthquake catalog is the source. | |
| Hail | 0 | 0 | 0 | 0 | 0 | 0 | 1955 to 2026-06-30 | No recorded events, 1955 to 2026-06-30, NOAA NCEI Storm Events |
| Heat Wave | 2 | 1 | 1 | 2 | 0 | 0 | 1996 to 2026-06-30 | |
| Hurricane | 15 | 0 | 0 | 0 | 15 | 1 | 1996 to 2026-06-30 | Includes 1 Tropical Depression record. |
| Inland Flooding | 11 | 0 | 0 | 0 | 5 | 0 | 1996 to 2026-06-30 | |
| Landslide | 0 | 0 | 0 | 0 | 5 | 1 | 1996 to 2026-06-30 | No Storm Events records of this type; 5 federal declared incidents (see declarations table) |
| Lightning | 0 | 0 | 0 | 0 | 0 | 0 | 1996 to 2026-06-30 | No recorded events, 1996 to 2026-06-30, NOAA NCEI Storm Events |
| Strong Wind | 5 | 0 | 0 | 0 | 0 | 0 | 1955 to 2026-06-30 | Includes 2 Strong Wind records. |
| Tornado | 0 | 0 | 0 | 0 | 0 | 0 | 1950 to 2026-06-30 | No recorded events, 1950 to 2026-06-30, NOAA NCEI Storm Events |
| Tsunami | 0 | 0 | 0 | 0 | 0 | 0 | 1996 to 2026-06-30 | No recorded events, 1996 to 2026-06-30, NOAA NCEI Storm Events |
| Volcanic Activity | 5 | 0 | 0 | 0 | 0 | 0 | 1996 to 2026-06-30 | |
| Wildfire | 0 | 0 | 0 | 0 | 0 | 0 | 1996 to 2026-06-30 | No recorded events, 1996 to 2026-06-30, NOAA NCEI Storm Events |
| Winter Weather | 0 | 0 | 0 | 0 | 0 | 0 | 1996 to 2026-06-30 | No recorded events, 1996 to 2026-06-30, NOAA NCEI Storm Events |
Notable Storm Events records
Sources: 1, 6, 7
| Date | Event type | Magnitude or extent | Damagenominal dollars | Deaths, injuriesdirect only | Location | Flags | Why listed |
|---|---|---|---|---|---|---|---|
| 2023-09-01 | Drought | $0 property; $0 crops, reported for the zone (2023 dollars) | 0, 0 | NWS zone VIZ001 (ST. THOMAS / ST. JOHN AND ADJACENT ISLANDS), zone-level | in the 12 months before plan approval; within last 5 years | B1-c worst recorded: Drought | |
| 2023-09-01 | Excessive Heat | $0 property; $0 crops, reported for the zone (2023 dollars) | 0, 0 | NWS zone VIZ001 (ST. THOMAS / ST. JOHN AND ADJACENT ISLANDS), zone-level | in the 12 months before plan approval; within last 5 years | B1-c worst recorded: Excessive Heat, Heat | |
| 2011-07-01 | Thunderstorm Wind | 41 kt (47 mph) measured gust | $100 property; $0 crops (2011 dollars) | 0, 0 | ST JOHN | B1-c worst recorded: Thunderstorm Wind | |
| 2010-08-30 | Strong Wind | 46 kt (53 mph) measured gust | $30,000 property; $0 crops, reported for the zone (2010 dollars) | 0, 0 | NWS zone VIZ001 (ST. THOMAS / ST. JOHN AND ADJACENT ISLANDS), zone-level | B1-c worst recorded: High Wind and Strong Wind | |
| 2004-09-14 | Tropical Storm | $2,400,000 property; crops not reported, reported for the zone (2004 dollars) | 0, 0 | NWS zone VIZ001 (ST. THOMAS / ST. JOHN AND ADJACENT ISLANDS), zone-level | B1-c most damaging: Hurricane, Tropical Storm, Tropical Depression | ||
| 2003-11-11 | Flood | $500,000 property; crops not reported, reported for the zone (2003 dollars) | 0, 0 | NWS zone VIZ001 (ST. THOMAS / ST. JOHN AND ADJACENT ISLANDS), zone-level | B1-c worst recorded: Flash Flood, Flood, Lakeshore Flood | ||
| 2002-09-16 | Thunderstorm Wind | speed not recorded | $10,000 property; crops not reported, reported for the zone (2002 dollars) | 0, 0 | Storm Events area ST. THOMAS/ST. JOHN & ISLANDS (legacy zone code VIZ001), zone-level | B1-c most damaging: Thunderstorm Wind | |
| 2001-07-29 | Volcanic Ash | $100,000 property; crops not reported, reported for the zone (2001 dollars) | 0, 0 | NWS zone VIZ001 (ST. THOMAS / ST. JOHN AND ADJACENT ISLANDS), zone-level | B1-c worst recorded: Volcanic Ash, Volcanic Ashfall | ||
| 2000-08-22 | Hurricane (Typhoon), NOAA's event type name | $100,000 property; crops not reported, reported for the zone (2000 dollars) | 0, 0 | NWS zone VIZ001 (ST. THOMAS / ST. JOHN AND ADJACENT ISLANDS), zone-level | B1-c worst recorded: Hurricane, Tropical Storm, Tropical Depression | ||
| 1998-06-21 | Thunderstorm Wind | speed not recorded | $5,000 property; crops not reported (1998 dollars) | 0, 0 | COUNTYWIDE | large reported damage |
The full list is in the Excel file, sheet "B1-d Storm Events history" (53 rows).
Location is the place NOAA recorded, as written in its data; it need not be a jurisdiction in this plan.
Local data needed: state-declared emergencies, from your state emergency management agency (federal data do not include them).
FEMA's declaration data list no tribal or special-area declarations for this state.
Supports FEMA checklist item B1-e: probability of future events
Probability: FEMA annualized frequency and descriptor per hazard
Sources: 5, 6
| Hazard | FEMA annualized frequency (modeled)unit per row | Unit | In plain terms | Descriptor | Descriptor basis | NRI events or days in its record period (hail, wind and tornado are area-weighted, so can be fractional) | NRI period | Location | Note |
|---|---|---|---|---|---|---|---|---|---|
| Coastal Flooding | 0.21 | events per year at a location (modeled) | about 0.21 per year at a given location in the county | Possible (from Storm Events: 2 of 30 years) | Storm Events records in 2 of 30 years, 1996 to 2025 (6.67%) | not shown | modeled | see B1-f | Descriptor from Storm Events, not NRI. |
| Cold Wave | 0 | event-days per year | none modeled | event-days in 0 of 30 years, 1996 to 2025 (0%) | 0 | 2005-11-12 to 2024-11-12 (19 years) | countywide | No Storm Events cold wave record, 1996 to 2025. | |
| Drought | 0 | event-days per year | none modeled | Likely (from Storm Events: 4 of 30 years) | event-days in 4 of 30 years, 1996 to 2025 (13.3%) | 0 | 2000 to 2025 (25.25 years; D3 and D4 only) | countywide | NRI models no drought event-days here (2000 to 2025, 25.25 years; D3 and D4 only); Storm Events has a record in 4 of 30 years. The descriptor comes from Storm Events, which counts D2 drought that NRI leaves out. |
| Earthquake | 0.127 | annual probability at a location | chance a given location in the county has at least minor-damage shaking in a year: 12.7% | not shown | modeled | see B1-f | No descriptor (Storm Events does not record earthquakes). | ||
| Hail | 0.00166 | events per year | about 1 in 602 years | Unlikely | FEMA annualized frequency (modeled) | 0.1 (modeled) | 1986 to 2023 (38 years) | countywide | |
| Heat Wave | 0 | event-days per year | none modeled | Possible (from Storm Events: 2 of 30 years) | event-days in 2 of 30 years, 1996 to 2025 (6.67%) | 0 | 2005-11-12 to 2024-11-12 (19 years) | countywide | NRI models no heat wave event-days here (2005-11-12 to 2024-11-12, 19 years); Storm Events has a record in 2 of 30 years. The descriptor comes from Storm Events, which records events NRI's definition leaves out. |
| Hurricane | 0.265 | events per year | about 1 in 4 years | Likely | FEMA annualized frequency (modeled) | 61 | 1851 to 2024 (Atlantic) | see B1-f | NRI counts hurricane and tropical storm tracks passing within storm-force wind range; federal declarations are in B1-d. |
| Inland Flooding | 0.321 | event-days per year | about 0.321 days per year | Likely (from Storm Events: 8 of 30 years) | event-days in 8 of 30 years, 1996 to 2025 (26.7%) | 9 | 1996 to 2023 (28 years) | see B1-f | |
| Landslide | events per year (modeled) | not shown | modeled | see B1-f | NRI publishes no annualized frequency for this hazard in this county. | ||||
| Lightning | days per year with a strike | not shown | 1995 to 2023 (29 years; CONUS) | countywide | Descriptor not assigned: NRI publishes no lightning frequency for this county. | ||||
| Strong Wind | 0.00166 | events per year | about 1 in 602 years | Unlikely | FEMA annualized frequency (modeled) | 1 | 1986 to 2023 (38 years) | countywide | |
| Tornado | 0.000484 | events per year | about 1 in 2,067 years | Unlikely | FEMA annualized frequency (modeled) | not shown | 1950 to 2023 (EF2+); 1986 to 2023 (EF0-1) | see B1-f | |
| Tsunami | 0.0419 | annual probability at the most exposed location (used in place of a county value) | chance at the county's most exposed location in a year: 4.19% | Storm Events records in 0 of 30 years, 1996 to 2025 (0%) | not shown | modeled | see B1-f | No descriptor: no Storm Events record 1996 to 2025 | |
| Volcanic Activity | 0.0101 | annual probability | about 1 in 99 years | Possible | FEMA annualized frequency (modeled) | not shown | modeled | see B1-f | |
| Wildfire | annual probability at a location | Storm Events records in 0 of 30 years, 1996 to 2025 (0%) | not shown | modeled | see B1-f | No descriptor: no Storm Events record 1996 to 2025 | |||
| Winter Weather | 0 | event-days per year | none modeled | event-days in 0 of 30 years, 1996 to 2025 (0%) | 0 | 2005-11-12 to 2024-11-12 (19 years) | countywide | No Storm Events winter weather record, 1996 to 2025 |
FEMA annualized frequency (modeled) is the National Risk Index v1.20 (December 2025) estimate of how often a hazard affects this county in a year; it is not recorded events divided by years, and its unit differs by hazard (events, event-days, or days with a lightning strike per year). For earthquake, wildfire, coastal flooding and tsunami the value is the chance (or number of events) at a location in the county, not across the county, so no "1 in N years" is given and the descriptor comes from Storm Events where it has a record (none for earthquake). The Methods page gives each hazard's method, from FEMA's National Risk Index Technical Documentation v1.20.
Descriptor scale used in this packet (defined per unit)
Sources: 5, 6
| Unit | Descriptor | Definition |
|---|---|---|
| events per year | Highly likely | 1 or more per year |
| events per year | Likely | about once in 1 to 10 years |
| events per year | Possible | about once in 10 to 100 years |
| events per year | Unlikely | less than once in 100 years |
| annual probability | Likely | 10% to under 100% chance in a given year |
| annual probability | Possible | 1% to under 10% chance in a given year |
| annual probability | Unlikely | under 1% chance in a given year |
| event-days (share of years) | Highly likely | event-days recorded in 90% or more of years |
| event-days (share of years) | Likely | event-days recorded in 10% to under 90% of years |
| event-days (share of years) | Possible | event-days recorded in some years but under 10% of years |
| lightning strike-days | Highly likely | cloud-to-ground strikes on 1 or more days per year |
Intensity bands: historical frequency (Storm Events)
Source: 6
| Hazard | Band | Years | Eventscounty-coded records | Years in period | Events per yearevents / years |
|---|---|---|---|---|---|
| Hail | 1.00-1.99 in | 1996 to 2025 | 0 | 30 | 0 |
| Hail | 2.00 in+ | 1996 to 2025 | 0 | 30 | 0 |
| Thunderstorm Wind (counted as NRI Strong Wind) | 50-64 kt | 1996 to 2025 | 0 | 30 | 0 |
| Thunderstorm Wind (counted as NRI Strong Wind) | 65 kt+ | 1996 to 2025 | 0 | 30 | 0 |
| Thunderstorm Wind (counted as NRI Strong Wind) | unmeasured or below 50 kt | 1996 to 2025 | 2 | 30 | 0.0667 |
| Tornado | EF0-1 | 1996 to 2025 | 0 | 30 | 0 |
| Tornado | EF2-3 | 1996 to 2025 | 0 | 30 | 0 |
| Tornado | EF4-5 | 1996 to 2025 | 0 | 30 | 0 |
| Tornado | unrated (EFU) | 1996 to 2025 | 0 | 30 | 0 |
The bands show how often events of each severity were recorded in this county, to profile how severe events have been (FEMA's probability item asks for the range of intensities).
Hail smaller than 1 inch is not counted: on 2010-01-05 the National Weather Service raised its severe-hail threshold from 3/4 inch to 1 inch, so smaller reports became less common after 2009 (NWS Service Change Notice 09-52). NRI hail frequency uses a 0.75 inch threshold.
Optional: future conditions. Not a required item in the 2025 FEMA Local Mitigation Planning Policy Guide; some states ask for it. The federal Climate Mapping for Resilience and Adaptation (CMRA) site gives county exposure to future climate conditions (https://resilience.climate.gov/).
Supports FEMA checklist item B1-f: hazards that vary across jurisdictions
Range of census tract risk within the county
Source: 5
| Hazard | Tractsrated of all | NRI risk score, 0 to 100 | Tracts by rating | ||
|---|---|---|---|---|---|
| Min | Median | Max | |||
| Coastal Flooding | 0 of 2 | Insufficient Data 2 | |||
| Cold Wave | 0 of 2 | Insufficient Data 2 | |||
| Drought | 0 of 2 | Insufficient Data 2 | |||
| Earthquake | 0 of 2 | Insufficient Data 2 | |||
| Hail | 0 of 2 | Insufficient Data 2 | |||
| Heat Wave | 0 of 2 | Insufficient Data 2 | |||
| Hurricane | 0 of 2 | Insufficient Data 2 | |||
| Inland Flooding | 0 of 2 | Insufficient Data 2 | |||
| Landslide | 0 of 2 | Insufficient Data 2 | |||
| Lightning | 0 of 2 | Insufficient Data 2 | |||
| Strong Wind | 0 of 2 | Insufficient Data 2 | |||
| Tornado | 0 of 2 | Insufficient Data 2 | |||
| Tsunami | 0 of 2 | Insufficient Data 2 | |||
| Volcanic Activity | 0 of 2 | Insufficient Data 2 | |||
| Wildfire | 0 of 2 | Insufficient Data 2 | |||
| Winter Weather | 0 of 2 | Insufficient Data 2 | |||
Rated tracts only: No Rating (score 0.0), Not Applicable and Insufficient Data tracts are counted but not used for the minimum, median and maximum.
The score ranks a tract against all U.S. tracts (100 = highest). The rating is FEMA's category for the tract's risk value, computed differently, so the two can disagree.
This county has 2 census tracts; the minimum, median and maximum come from those 2.
Each jurisdiction (starting figures from federal data)
Sources: 1, 3, 4, 6
| Jurisdiction | Type | Plan status | Repetitive lossFMA RL and SRL (44 CFR 77.2); repeat-flood, any definition | Public Assistance to this jurisdictionFEMA records matched by applicant name; federal share obligated, nominal dollars | Event records naming this placeall years; since its plan | Notes |
|---|---|---|---|---|---|---|
| No rows for this unit. | ||||||
No city, town, township or county rows in FEMA plan data for this unit; same as county.
Supports FEMA checklist items B2-a and B2-b: vulnerability and potential impacts
Local data needed
The table below gives county-level starting figures; the plan describes impacts for each jurisdiction and its own assets.
- Critical facilities and lifelines per hazard
- A problem statement per jurisdiction per hazard
- Changes in development in hazard-prone areas since the last approval, or a statement of none (E1-a)
- Future assets
County-level starter: exposure, expected annual loss and damage since the plan
Sources: 1, 2, 3, 5, 6, 7
| Hazard | Building exposuremodeled dollars | Agriculture exposuremodeled dollars | Population exposedpeople | EAL buildingsmodeled dollars per year | EAL agriculturemodeled dollars per year | Cost of expected deaths and injuriesFEMA's dollar value per year, not property damage | EAL as % of exposurebuildings; agriculture where noted | Storm Events damage since 2024-07-01county-coded records, property plus crops, nominal dollars | Zone-level damage since planproperty plus crops, reported for the zone | Public Assistance since plannominal dollars; see note | Note |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Coastal Flooding | $144,990,986 | n/a | 202 | $12,302 | n/a | $204 | 0.00848% | ||||
| Cold Wave | $0 | $0 | 0 | $0 | $0 | $0 | building exposure is 0 in NRI | ||||
| Drought | n/a | $0 | n/a | n/a | $0 | n/a | agriculture exposure is 0 in NRI | ||||
| Earthquake | $2,218,408,546 | n/a | 3,882 | $703,745 | n/a | $121,371 | 0.0317% | ||||
| Hail | $1,386,875,198 | $0 | 3,882 | $41 | $0 | $3 | under 0.0001% | ||||
| Heat Wave | $0 | $0 | 0 | $0 | $0 | $0 | $0 | building exposure is 0 in NRI | |||
| Hurricane | $1,386,875,198 | $0 | 3,882 | $5,270,219 | $0 | $153,377 | 0.38% | no Public Assistance recorded (2 declarations) | |||
| Inland Flooding | $1,375,018,640 | $0 | 199 | $384,438 | $0 | $1,392 | n/a (see note) | NRI counts the full building value of any census block with some flood loss; this is not the value of buildings in the floodplain. Use local FIRM overlays for B2-a/B2-b. | |||
| Landslide | n/a | n/a | n/a | n/a | n/a | n/a | no Public Assistance recorded (1 declaration) | NRI publishes no building exposure for this county | |||
| Lightning | n/a | n/a | n/a | n/a | n/a | n/a | NRI publishes no building exposure for this county | ||||
| Strong Wind | $1,386,875,198 | $0 | 3,882 | $10 | $0 | $3 | under 0.0001% | ||||
| Tornado | $1,386,875,198 | $0 | 3,882 | $359 | $0 | $175 | under 0.0001% | ||||
| Tsunami | $1,179,399,465 | n/a | 342 | $70,188 | n/a | $0 | 0.00595% | ||||
| Volcanic Activity | $1,386,875,198 | n/a | 3,882 | $1 | n/a | $93 | under 0.0001% | ||||
| Wildfire | n/a | n/a | n/a | n/a | n/a | n/a | NRI publishes no building exposure for this county | ||||
| Winter Weather | $0 | $0 | 0 | $0 | $0 | $0 | building exposure is 0 in NRI |
Totals since 2024-07-01 (Storm Events through 2026-06-30): 0 county-coded records, 0 with a damage value recorded (including $0), $0; 1 zone-level records, 1 with a damage value recorded (including $0), $0 reported for the zone; Public Assistance: none recorded on the 2 counted declarations.
FEMA does not split Public Assistance by hazard. A declaration mapped to several hazards is listed under each of them with its full amount, so the per-hazard column does not add up to the total; the unit total counts each declaration once.
NRI computes earthquake exposure on its own basis, so it exceeds the county building value in B2-a.
Supports FEMA checklist item B2-a: vulnerability (county context)
County context
Source: 5
| Measure | Value |
|---|---|
| Population | 3,882 |
| Building value (total, not at risk) | $1,386,875,198 |
| Agriculture value (total, not at risk) | $0 |
| NRI risk rating (all hazards) | Insufficient Data |
| Expected annual loss, buildings and agriculture, all hazards | $6,441,301 |
| Expected annual loss, population equivalence, all hazards (NRI values each statistical life at $13.7M; a modeled value of expected deaths and injuries, not property damage) | $276,619 |
| Social vulnerability rating | Data Unavailable |
| Community resilience rating | Data Unavailable |
| NRI version | December 2025 |
FEMA's all-hazard expected annual loss adds buildings, agriculture and population equivalence; this table gives the property part and the population-equivalence part as separate rows.
Social vulnerability: higher means people are more likely to be harmed and slower to recover. Community resilience: lower means the community is less able to recover. High social vulnerability and low resilience both raise the NRI risk rating.
Supports FEMA checklist item B2-c: repetitive loss properties
Repetitive loss in this county, both definitions
Sources: 1, 4
| Definition | Properties | Severe repetitive loss | Properties |
|---|---|---|---|
| Repetitive loss, FMA definition (44 CFR 77.2) | 0 | Severe repetitive loss, FMA definition (44 CFR 77.2) | 0 |
| Repetitive loss, NFIP insurance definition | 2 | Severe repetitive loss, NFIP insurance definition | 0 |
The state NFIP coordinator's list, the source FEMA's Handbook names, often uses the NFIP insurance definition (second row).
Repeat-flood properties: county and state-level rows
Sources: 1, 4
| Scope | RL, FMAproperties | SRL, FMAproperties | RL, NFIPproperties | SRL, NFIPproperties | Any categoryproperties | Mitigatedproperties | Currently insuredproperties |
|---|---|---|---|---|---|---|---|
| County total | 0 | 0 | 2 | 0 | 2 | 0 | 0 |
| of which: Territory of Virgin Islands (community ID not in plan data) | 0 | 0 | 2 | 0 | 2 | 0 | 0 |
| Statewide, no county in FEMA's file | 0 | 1 | 10 | 1 | 10 | 0 | 0 |
The statewide row counts properties FEMA's file gives with no county in this state; they are listed for reference and are not in this county's counts.
County repeat-flood properties by occupancy group
Sources: 1, 4
| Occupancy group | RL, FMAproperties | SRL, FMAproperties | RL, NFIPproperties | SRL, NFIPproperties | Any categoryproperties | Mitigatedproperties | Currently insuredproperties |
|---|---|---|---|---|---|---|---|
| single-family residential | 0 | 0 | 2 | 0 | 2 | 0 | 0 |
| 2 to 4 unit residential | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| other residential | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| non-residential | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| not reported | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
FEMA's occupancy groups have no institutional class; institutional properties are counted in non-residential or other residential in the table by occupancy group.
FMA RL and FMA SRL are the Flood Mitigation Assistance definitions (44 CFR 77.2), the ones the FEMA Local Mitigation Planning Policy Guide cites. NFIP repetitive loss (the FEMA insurance definition) is 2 or more claims over $1,000 in 10 years, and a property can leave that group once it is mitigated. Also shown: NFIP severe repetitive loss, any category, mitigated and currently insured. The Methods page gives the OpenFEMA field details.
Counts are aggregates of FEMA's public NFIP Multiple Loss Properties file (FEMA's data date 2026-08-02; file version 2026-08-04). No property is identified. County assignment is FEMA's geocode.
In this county 0 properties are FMA repetitive loss but not NFIP repetitive loss, and 2 properties are NFIP repetitive loss but not FMA repetitive loss.
Exact counts; no count suppression.
Sources
Tables cite these sources by number. The full list, for the plan's bibliography (FEMA review item A4-a):
- FEMA, OpenFEMA HazardMitigationPlanStatuses v1, version 2026-09-29T134039Z, pulled 2026-09-30, https://www.fema.gov/api/open/v1/HazardMitigationPlanStatuses (API)
- FEMA, OpenFEMA DisasterDeclarationsSummaries v2, version 2026-09-29T162832Z, pulled 2026-09-30, https://www.fema.gov/api/open/v2/DisasterDeclarationsSummaries (API)
- FEMA, OpenFEMA PublicAssistanceFundedProjectsSummaries v1, version 2026-09-29T150754Z, pulled 2026-09-30, https://www.fema.gov/api/open/v1/PublicAssistanceFundedProjectsSummaries (API)
- FEMA, OpenFEMA NfipMultipleLossProperties v1, version 2026-08-04T164045Z, pulled 2026-09-30, https://www.fema.gov/api/open/v1/NfipMultipleLossProperties (API)
- FEMA, FEMA National Risk Index 1.20.0 (December 2025), county and census tract tables, version 1.20.0, pulled 2026-09-30, https://www.fema.gov/about/reports-and-data/openfema/nri/v120/NRI_Table_Counties.zip (download, 25 MB), https://www.fema.gov/about/reports-and-data/openfema/nri/v120/NRI_Table_CensusTracts.zip (download, 635 MB)
- NOAA NCEI, NOAA NCEI Storm Events Database, details files (csvfiles v1.0), version c20260918, pulled 2026-09-30, https://www.ncei.noaa.gov/pub/data/swdi/stormevents/csvfiles/
- NOAA National Weather Service, NWS county-public forecast zones correlation file, version bp03mr20 to bp16ap26 (11 files; newest bp16ap26), pulled 2026-09-30, https://www.weather.gov/gis/ZoneCounty
- U.S. Census Bureau, Census 2024 Gazetteer, 2020 place by county, CT county-to-cousub crosswalk, version 2024-gazetteer, pulled 2026-09-30, https://www2.census.gov/geo/docs/maps-data/data/gazetteer/2024_Gazetteer/2024_Gaz_counties_national.zip, https://www2.census.gov/geo/docs/maps-data/data/gazetteer/2024_Gazetteer/2024_Gaz_cousubs_national.zip, https://www2.census.gov/geo/docs/maps-data/data/gazetteer/2024_Gazetteer/2024_Gaz_place_national.zip, https://www2.census.gov/geo/docs/maps-data/data/gazetteer/2024_Gazetteer/2024_Gaz_unsd_national.zip, https://www2.census.gov/geo/docs/maps-data/data/gazetteer/2024_Gazetteer/2024_Gaz_elsd_national.zip, https://www2.census.gov/geo/docs/maps-data/data/gazetteer/2024_Gazetteer/2024_Gaz_scsd_national.zip, https://www2.census.gov/geo/docs/reference/codes2020/national_place_by_county2020.txt, https://www2.census.gov/geo/docs/reference/ct_change/ct_cou_to_cousub_crosswalk.xlsx (used to match place names and codes; no table prints its values)
What this packet is and what the plan adds
This packet is the federal data for the plan's risk assessment, organized by the items of FEMA's Local Mitigation Plan Review Tool, Element B. Each section heading names the item its tables support; the plan and FEMA's review decide whether the item is met.
The plan adds what only the community has: local data on assets, critical facilities, development and each jurisdiction's impacts; local hazard history, including state-declared emergencies; the mitigation strategy; and adoption.
How the federal data are built: National Risk Index values are FEMA's model, not counts of events. Storm Events is more complete from 1996; zone-level records are placed by forecast zone, not by location in the county. Public Assistance for a jurisdiction is matched by applicant name. The Methods page gives every rule and the known edge cases.
OpenFEMA disclaimer
This product uses the Federal Emergency Management Agency's OpenFEMA API, but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).
Reuse, citation and corrections
Reuse and citation: Hazard Plain text and tables are licensed under Creative Commons Attribution 4.0 International (CC BY 4.0, https://creativecommons.org/licenses/by/4.0/); credit Hazard Plain and the release. The underlying federal data are public domain; OpenFEMA data are also subject to the OpenFEMA terms and conditions.
Cite this: Hazard Plain (2026). St. John Island, VI: risk-assessment baseline packet, release 2026-10 (data as of 2026-09-30; County FIPS 78020). Automated baseline. https://hazardplain.org/vi/78020/ Built from FEMA OpenFEMA, the FEMA National Risk Index and NOAA NCEI Storm Events; source versions in the packet's Sources list.
Corrections: to report an error, name the packet, the table and what your records show. Contact: contact@hazardplain.org
Hazard Plain release 2026-10. As of 2026-09-30; Storm Events data through 2026-06-30. Automated baseline.