Hazard Plain Automated baseline

St. Croix Island, VI

Risk-assessment baseline packet

County FIPS:
78010
Release:
2026-10
Data as of:
2026-09-30
Storm Events data through:
2026-06-30

Hazard Plain is an independent product built from public federal data. It is not a FEMA document and is not reviewed or endorsed by FEMA or any state agency.

Hazard Plain release 2026-10, as of 2026-09-30.

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: 17 records (data through 2026-06-30).

Highest expected annual loss (FEMA National Risk Index, modeled total; see B1-a): Hurricane ($42,187,678 a year), Tsunami ($11,952,749) and Earthquake ($7,258,293).

Repetitive-loss flood properties now: FMA RL 1, SRL 24 (44 CFR 77.2); any definition: 189.

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:
17 records (data through 2026-06-30)
Repetitive loss now:
FMA RL 1, SRL 24 (44 CFR 77.2); any definition: 189
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

JurisdictionTypeStatusPlanApprovedExpiresDays to expirynegative = days since expiryUpdate underwayNotes
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 EALHazardNRI risk ratingEAL ratingEAL buildingsmodeled dollars per yearEAL agriculturemodeled dollars per yearCost of expected deaths and injuriesFEMA's dollar value per year, not property damageEAL total (see note)modeled dollars per yearStorm Events records, 1996 to 2026-06-30countStorm Events coverage note
1HurricaneInsufficient DataRelatively High$40,589,267$17,619$1,580,792$42,187,67814Includes 1 Tropical Depression record (outside NRI's Hurricane definition).
2TsunamiInsufficient DataRelatively Moderate$346,949n/a$11,605,800$11,952,7490No recorded events in Storm Events since 1996 (data through 2026-06-30).
3EarthquakeInsufficient DataRelatively Moderate$4,809,299n/a$2,448,994$7,258,293Storm Events does not record earthquakes.
4Inland FloodingInsufficient DataVery Low$3,656,249$2,983$181,481$3,840,71358
5Coastal FloodingInsufficient DataRelatively Low$33,676n/a$801$34,4779
6TornadoInsufficient DataVery Low$2,795under $1$1,835$4,6301
7Volcanic ActivityInsufficient DataVery Low$4n/a$979$98311
8HailInsufficient DataVery Low$321$1$36$3572
9Strong WindInsufficient DataVery Low$80under $1$35$11516Includes 3 High Wind and 3 Strong Wind records (NOAA non-thunderstorm wind types, outside NRI's Strong Wind definition).
10Cold WaveInsufficient DataNo Expected Annual Losses$0$0$0$01
11DroughtInsufficient DataNo Expected Annual Lossesn/a$0n/a$013
12Heat WaveInsufficient DataNo Expected Annual Losses$0$0$0$014
13Winter WeatherInsufficient DataNo Expected Annual Losses$0$0$0$00No recorded events in Storm Events since 1996 (data through 2026-06-30).
LandslideInsufficient DataInsufficient Datan/an/an/an/a1
LightningInsufficient DataInsufficient Datan/an/an/an/a4
WildfireInsufficient DataInsufficient Datan/an/an/an/a19

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 and winter weather 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

HazardHighest-rated census tractsNRI risk rating, score 0 to 100
Earthquakeno tract has a National Risk Index rating for this hazard
Hurricaneno tract has a National Risk Index rating for this hazard
Landslideno tract has a National Risk Index rating for this hazard
Tornadono tract has a National Risk Index rating for this hazard
Tsunamino tract has a National Risk Index rating for this hazard
Volcanic Activityno tract has a National Risk Index rating for this hazard
Wildfireno 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

HazardScaleRecordscount and yearsObserved rangeWorst recorded eventMost damaging (when different)How it applies to jurisdictionsNote
Coastal Flood, Storm Surge/Tidenone in data (flood depth: FIRM)9 records, 2010 to 2024 (9 zone-level)Coastal Flood, 2022-12-09, $400 property; $0 crops (2022 dollars); NWS zone VIZ002Countywide (zone-level records).Flood depth: see the FEMA Flood Insurance Rate Map.
Cold/Wind Chill, Extreme Cold/Wind Chillwind chill1 record, 2000 (1 zone-level)5 days; 1 with a recorded value5 consecutive days, 2000-01-16 to 2000-01-20, zone-levelCountywide (zone-level records).Wind chill: in event narratives only (local data needed).
Frost/Freeze (outside NRI's Cold Wave definition)crop damage0Temperature: in event narratives only (local data needed).
DroughtU.S. Drought Monitor scale (D0 to D4)13 records, 1997 to 2023 (13 zone-level)31 days to 112 days (median 56.5 days); 6 with a recorded value112 days (about 3.7 months), 2022-06-01 to 2022-09-20, a run of 4 consecutive Storm Events drought records, zone-levelDrought, 2002-12-01, property not reported; $200,000 crops, reported for the zone (2002 dollars)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.
EarthquakeModified Mercalli (local data)0Storm Events does not record earthquakes; the USGS earthquake catalog is the source.
Hailhail size (inches)2 records, 2000 to 2023 (1 zone-level)0.25 in to 0.75 in (median 0.5 in); 2 with a recorded value0.75 in hail, 2000-10-19; NWS zone VIZ002Hail, 2023-04-06, $1,000 property; $0 crops (2023 dollars)No event record names a jurisdiction in the plan. Zone-level records (1) apply countywide.
Excessive Heat, Heatheat index (in event narratives)14 records, 2023 to 2024 (14 zone-level)1 day to 30 days (median 1 day); 11 with a recorded valueSeptember 2023 (1 monthly summary record), zone-levelCountywide (zone-level records).Heat index: in event narratives only (local data needed).
Hurricane, Tropical Storm, Tropical DepressionSaffir-Simpson14 records, 1997 to 2021 (14 zone-level)Strongest recorded: Hurricane (Typhoon) record (NOAA's event type name), 1999-11-16 to 1999-11-18, $20,000,000 property; crops not reported (1999 dollars); Storm Events area ST. CROIX (legacy zone code VIZ010)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 Flooddamage and flood days (flood depth: FIRM)58 records, 1997 to 2025 (10 zone-level)Flash Flood, 2010-11-10, $1,400,000 property; $0 crops (2010 dollars)No event record names a jurisdiction in the plan. Zone-level records (10) 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 Flownone (count and damage only)1 record, 2025Debris Flow, 2025-09-18, $1,100 property; $0 crops (2025 dollars)No event record names a jurisdiction in the plan.Physical measure: in event narratives only (local data needed).
Lightningannualized frequency (the measure FEMA's Local Mitigation Planning Handbook names)4 records, 2003 to 2010 (3 zone-level)Lightning, 2003-09-21, damage not reported, 1 direct death, 1 direct injury (reported for the zone); NWS zone VIZ002Lightning, 2005-05-23, $60,000 property; crops not reported, reported for the zone (2005 dollars)No event record names a jurisdiction in the plan. Zone-level records (3) apply countywide.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)6 records, 1997 to 2006 (5 zone-level)49 kt (56 mph) to 62 kt (71 mph) (median 50 kt (58 mph)); 3 with a recorded value62 kt (71 mph) measured gust, High Wind, 2003-10-09; NWS zone VIZ002High Wind, 1997-10-13, $500,000 property; crops not reported (1997 dollars)No event record names a jurisdiction in the plan. Zone-level records (5) apply countywide.
Thunderstorm Windwind speed (kt and mph)10 records, 1997 to 2013 (3 zone-level)40 kt (46 mph) to 56 kt (64 mph) (median 46 kt (53 mph)); 7 with a recorded value56 kt (64 mph), measurement type not recorded, Thunderstorm Wind, 1998-08-24Thunderstorm Wind, 1998-06-21, $20,000 property; crops not reported (1998 dollars)No event record names a jurisdiction in the plan. Zone-level records (3) apply countywide.
TornadoEnhanced Fujita (Fujita before Feb 2007)1 record, 2019F/EF0; 1 with a recorded valueEF0 tornado, 2019-07-25, 0.5 mi within this county, 5 yd wide, $0 property; $0 crops (2019 dollars)No event record names a jurisdiction in the plan.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).
Tsunaminone (count and damage only)0Physical measure: in event narratives only (local data needed).
Volcanic Ash, Volcanic AshfallVolcanic Explosivity Index (local data)11 records, 1997 to 2008 (9 zone-level)Volcanic Ash, 2001-07-29, $100,000 property; crops not reported (2001 dollars); NWS zone VIZ002No event record names a jurisdiction in the plan. Zone-level records (9) apply countywide.Physical measure: in event narratives only (local data needed).
Wildfireacres burned (local data)19 records, 2000 to 2010 (18 zone-level)Wildfire, 2003-03-13, $100,000 property; crops not reported (2003 dollars); NWS zone VIZ002No event record names a jurisdiction in the plan. Zone-level records (18) apply countywide.Acres burned: in event narratives only (local data needed).
Winter Storm, Heavy Snow, Blizzard, Lake-Effect Snow, Winter Weather, Sleetnone in data (snowfall: local data)0Snow 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: 29 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

DeclaredIncident beganFEMA numberTypeTitleMapped hazardCounty Public Assistancefederal share obligated, nominal dollarsFlagsNotes
2024-10-252024-08-13DR-4841-VIMajor disasterTropical Storm ErnestoHurricaneno Public Assistance recordednew since last plan; within last 5 years
2024-08-182024-08-13EM-3611-VIEmergencyTropical Storm ErnestoHurricane (primary); also designated: Landslideno Public Assistance recordednew since last plan; within last 5 yearssame incident as DR-4841
2023-11-182023-10-25EM-3603-VIEmergencyElevated Levels of Lead and Copper in the Water SupplyNon-natural, not countedno Public Assistance recordedin the 12 months before plan approval; within last 5 years
2022-07-252022-07-15EM-3581-VIEmergencyWater Shortage and Health Impact from Unprecedented Sargassum Seagrass InfluxOther, not an NRI hazard; not countedno Public Assistance recordedwithin last 5 years
2020-07-292020-07-27EM-3531-VIEmergencyPotential Tropical Cyclone NineHurricaneno Public Assistance recorded
2020-04-022020-01-20DR-4513-VIMajor disasterCOVID-19 PandemicNon-natural, not countedno Public Assistance recorded
2020-03-132020-01-20EM-3433-VIEmergencyCOVID-19Non-natural, not countedno Public Assistance recordedsame incident as DR-4513
2019-08-282019-08-26EM-3418-VIEmergencyHurricane DorianHurricaneno Public Assistance recorded
2017-09-202017-09-16DR-4340-VIMajor disasterHurricane MariaHurricane$28,518,396.45
2017-09-182017-09-16EM-3390-VIEmergencyHurricane MariaHurricaneno Public Assistance recordedsame incident as DR-4340
2017-09-072017-09-05DR-4335-VIMajor disasterHurricane IrmaHurricane$41,502.49
2017-09-052017-09-05EM-3383-VIEmergencyHurricane IrmaHurricaneno Public Assistance recordedsame incident as DR-4335
2010-11-242010-11-08DR-1949-VIMajor disasterSevere Storms, Flooding, Rockslides, and Mudslides Assoc. with Ts TomasHurricane; Inland Flooding; Landslide$9,249.99
2010-11-052010-10-01DR-1948-VIMajor disasterSevere Storms, Flooding, Mudslides, and LandslidesInland Flooding; Landslideno Public Assistance recorded
2010-09-282010-08-29DR-1939-VIMajor disasterHurricane EarlHurricaneno Public Assistance recorded
2008-10-292008-10-14DR-1807-VIMajor disasterHurricane OmarHurricane$19,449.27
2004-10-072004-09-14DR-1567-VIMajor disasterTropical Storm JeanneHurricaneno Public Assistance recorded
2003-12-092003-11-10DR-1503-VIMajor disasterSevere Storms, Flooding, Landslides, and MudslidesInland Flooding; Landslide$0
1999-11-231999-11-17DR-1309-VIMajor disasterHurricane Lenny Major DeclarationHurricane$311,077.41
1999-11-171999-11-17EM-3152-VIEmergencyHurricane LennyHurricaneno Public Assistance recordedsame incident as DR-1309
1998-09-241998-09-19DR-1248-VIMajor disasterHurricane Georges - 18 Sep 98Hurricaneno Public Assistance recorded
1996-07-111996-07-08DR-1126-VIMajor disasterHurricane BerthaHurricaneno Public Assistance recorded
1995-09-161995-09-15DR-1067-VIMajor disasterHurricane MarilynHurricaneno Public Assistance recorded
1989-09-201989-09-17DR-841-VIMajor disasterHurricane HugoHurricaneno Public Assistance recorded
1984-12-101984-11-05DR-729-VIMajor disasterTropical Storm KlausHurricaneno Public Assistance recorded
1979-09-161979-09-16DR-602-VIMajor disasterHurricane David, Tropical Storm FredericHurricaneno Public Assistance recorded
1977-06-141977-06-14EM-3042-VIEmergencyDroughtDroughtno Public Assistance recorded
1974-11-141974-11-14DR-451-VIMajor disasterSevere Storms, Landslides & FloodingInland Flooding (primary); also designated: Landslideno Public Assistance recorded
1974-07-221974-07-22EM-3001-VIEmergencyDrought, Livestock LossesDroughtno 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

DeclaredIncident beganFEMA numberTypeTitleMapped hazard
1998-09-211998-09-21EM-3129-VIEmergencyHurricane Georges (Direct Federal Assist First 72 Hrs)Hurricane
1964-06-081964-06-08DR-171-VIMajor disasterExtreme Drought ConditionsDrought

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

HazardStorm Events records, all years on file(years in the Period column)Since plan approvalrecordsIn the 12 months before plan approvalrecordsLast 5 yearsrecordsDeclared incidents, all yearsseparate disastersDeclared since approvalseparate disastersPeriodStatement
Coastal Flooding9427001996 to 2026-06-30
Cold Wave1000001996 to 2026-06-30
Drought130410201996 to 2026-06-30
Earthquake000000Storm Events does not record earthquakes; the USGS earthquake catalog is the source.
Hail2001001955 to 2026-06-30
Heat Wave149514001996 to 2026-06-30
Hurricane140001611996 to 2026-06-30Includes 1 Tropical Depression record.
Inland Flooding58326401996 to 2026-06-30
Landslide1101511996 to 2026-06-30
Lightning4000001996 to 2026-06-30
Strong Wind16000001955 to 2026-06-30Includes 3 High Wind and 3 Strong Wind records.
Tornado1000001950 to 2026-06-30
Tsunami0000001996 to 2026-06-30No recorded events, 1996 to 2026-06-30, NOAA NCEI Storm Events
Volcanic Activity11000001996 to 2026-06-30
Wildfire19000001996 to 2026-06-30
Winter Weather0000001996 to 2026-06-30No recorded events, 1996 to 2026-06-30, NOAA NCEI Storm Events

Notable Storm Events records

Sources: 1, 6, 7

DateEvent typeMagnitude or extentDamagenominal dollarsDeaths, injuriesdirect onlyLocationFlagsWhy listed
2023-09-01Excessive Heat$0 property; $0 crops, reported for the zone (2023 dollars)0, 0NWS zone VIZ002 (ST. CROIX), zone-levelin the 12 months before plan approval; within last 5 yearsB1-c worst recorded: Excessive Heat, Heat
2022-12-09Coastal Flood$400 property; $0 crops, reported for the zone (2022 dollars)0, 0NWS zone VIZ002 (ST. CROIX), zone-levelwithin last 5 yearsB1-c worst recorded: Coastal Flood, Storm Surge/Tide
2022-06-01Drought$0 property; $0 crops, reported for the zone (2022 dollars)0, 0NWS zone VIZ002 (ST. CROIX), zone-levelwithin last 5 yearsB1-c worst recorded: Drought
2019-07-25TornadoEF0, 0.5 mi within this county, 5 yd wide$0 property; $0 crops (2019 dollars)0, 0ST CROIXB1-c worst recorded: Tornado
2010-11-10Flash Flood$1,400,000 property; $0 crops (2010 dollars)0, 0ST CROIXB1-c worst recorded: Flash Flood, Flood, Lakeshore Flood
2003-10-09High Wind62 kt (71 mph) measured gustdamage not reported0, 0NWS zone VIZ002 (ST. CROIX), zone-levelB1-c worst recorded: High Wind and Strong Wind
2003-09-21Lightningdamage not reported1, 1NWS zone VIZ002 (ST. CROIX), zone-leveldeaths or injuries recorded
2001-07-29Volcanic Ash$100,000 property; crops not reported, reported for the zone (2001 dollars)0, 0NWS zone VIZ002 (ST. CROIX), zone-levelB1-c worst recorded: Volcanic Ash, Volcanic Ashfall
2000-10-19Hail0.75 indamage not reported0, 0NWS zone VIZ002 (ST. CROIX), zone-levelB1-c worst recorded: Hail
2000-01-16Extreme Cold/Wind Chilldamage not reported0, 0Storm Events area ST. CROIX (legacy zone code VIZ010), zone-levelB1-c worst recorded: Cold/Wind Chill, Extreme Cold/Wind Chill
1999-11-16Hurricane (Typhoon), NOAA's event type name$20,000,000 property; crops not reported, reported for the zone (1999 dollars)0, 0Storm Events area ST. CROIX (legacy zone code VIZ010), zone-levelB1-c worst recorded: Hurricane, Tropical Storm, Tropical Depression
1998-08-24Thunderstorm Wind56 kt (64 mph), measurement type not recordeddamage not reported0, 0ST. CROIXB1-c worst recorded: Thunderstorm Wind

The full list is in the Excel file, sheet "B1-d Storm Events history" (163 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

HazardFEMA annualized frequency (modeled)unit per rowUnitIn plain termsDescriptorDescriptor basisNRI events or days in its record period (hail, wind and tornado are area-weighted, so can be fractional)NRI periodLocationNote
Coastal Flooding0.252events per year at a location (modeled)about 0.25 per year at a given location in the countyLikely (from Storm Events: 4 of 30 years)Storm Events records in 4 of 30 years, 1996 to 2025 (13.3%)not shownmodeledsee B1-fDescriptor from Storm Events, not NRI.
Cold Wave0event-days per yearnone modeledPossible (from Storm Events: 1 of 30 years)event-days in 1 of 30 years, 1996 to 2025 (3.33%)02005-11-12 to 2024-11-12 (19 years)countywideNRI models no cold wave event-days here (2005-11-12 to 2024-11-12, 19 years); Storm Events has a record in 1 of 30 years. The descriptor comes from Storm Events, which records events NRI's definition leaves out.
Drought0event-days per yearnone modeledLikely (from Storm Events: 5 of 30 years)event-days in 5 of 30 years, 1996 to 2025 (16.7%)02000 to 2025 (25.25 years; D3 and D4 only)countywideNRI models no drought event-days here (2000 to 2025, 25.25 years; D3 and D4 only); Storm Events has a record in 5 of 30 years. The descriptor comes from Storm Events, which counts D2 drought that NRI leaves out.
Earthquake0.065annual probability at a locationchance a given location in the county has at least minor-damage shaking in a year: 6.5%not shownmodeledsee B1-fNo descriptor (Storm Events does not record earthquakes).
Hail0.00166events per yearabout 1 in 602 yearsUnlikelyFEMA annualized frequency (modeled)0.1 (modeled)1986 to 2023 (38 years)countywide
Heat Wave0event-days per yearnone modeledPossible (from Storm Events: 2 of 30 years)event-days in 2 of 30 years, 1996 to 2025 (6.67%)02005-11-12 to 2024-11-12 (19 years)countywideNRI 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.
Hurricane0.258events per yearabout 1 in 4 yearsLikelyFEMA annualized frequency (modeled)661851 to 2024 (Atlantic)see B1-fNRI counts hurricane and tropical storm tracks passing within storm-force wind range; federal declarations are in B1-d.
Inland Flooding1.39event-days per yearabout 1.39 days per yearLikely (from Storm Events: 18 of 30 years)event-days in 18 of 30 years, 1996 to 2025 (60%)391996 to 2023 (28 years)see B1-f
Landslideevents per year (modeled)not shownmodeledsee B1-fNRI publishes no annualized frequency for this hazard in this county.
Lightningdays per year with a strikenot shown1995 to 2023 (29 years; CONUS)countywideDescriptor not assigned: NRI publishes no lightning frequency for this county.
Strong Wind0.00161events per yearabout 1 in 622 yearsUnlikelyFEMA annualized frequency (modeled)11986 to 2023 (38 years)countywide
Tornado0.00166events per yearabout 1 in 602 yearsUnlikelyFEMA annualized frequency (modeled)not shown1950 to 2023 (EF2+); 1986 to 2023 (EF0-1)see B1-f
Tsunami0.0419annual 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 shownmodeledsee B1-fNo descriptor: no Storm Events record 1996 to 2025
Volcanic Activity0.0101annual probabilityabout 1 in 99 yearsPossibleFEMA annualized frequency (modeled)not shownmodeledsee B1-f
Wildfireannual probability at a locationLikely (from Storm Events: 7 of 30 years)Storm Events records in 7 of 30 years, 1996 to 2025 (23.3%)not shownmodeledsee B1-fDescriptor from Storm Events, not NRI.
Winter Weather0event-days per yearnone modeledevent-days in 0 of 30 years, 1996 to 2025 (0%)02005-11-12 to 2024-11-12 (19 years)countywideNo 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

UnitDescriptorDefinition
events per yearHighly likely1 or more per year
events per yearLikelyabout once in 1 to 10 years
events per yearPossibleabout once in 10 to 100 years
events per yearUnlikelyless than once in 100 years
annual probabilityLikely10% to under 100% chance in a given year
annual probabilityPossible1% to under 10% chance in a given year
annual probabilityUnlikelyunder 1% chance in a given year
event-days (share of years)Highly likelyevent-days recorded in 90% or more of years
event-days (share of years)Likelyevent-days recorded in 10% to under 90% of years
event-days (share of years)Possibleevent-days recorded in some years but under 10% of years
lightning strike-daysHighly likelycloud-to-ground strikes on 1 or more days per year

Intensity bands: historical frequency (Storm Events)

Source: 6

HazardBandYearsEventscounty-coded recordsYears in periodEvents per yearevents / years
Hail1.00-1.99 in1996 to 20250300
Hail2.00 in+1996 to 20250300
Thunderstorm Wind (counted as NRI Strong Wind)50-64 kt1996 to 20253300.1
Thunderstorm Wind (counted as NRI Strong Wind)65 kt+1996 to 20250300
Thunderstorm Wind (counted as NRI Strong Wind)unmeasured or below 50 kt1996 to 20254300.133
TornadoEF0-11996 to 20251300.0333
TornadoEF2-31996 to 20250300
TornadoEF4-51996 to 20250300
Tornadounrated (EFU)1996 to 20250300

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

HazardTractsrated of allNRI risk score, 0 to 100Tracts by rating
MinMedianMax
Coastal Flooding0 of 15Insufficient Data 15
Cold Wave0 of 15Insufficient Data 15
Drought0 of 15Insufficient Data 15
Earthquake0 of 15Insufficient Data 15
Hail0 of 15Insufficient Data 15
Heat Wave0 of 15Insufficient Data 15
Hurricane0 of 15Insufficient Data 15
Inland Flooding0 of 15Insufficient Data 15
Landslide0 of 15Insufficient Data 15
Lightning0 of 15Insufficient Data 15
Strong Wind0 of 15Insufficient Data 15
Tornado0 of 15Insufficient Data 15
Tsunami0 of 15Not Applicable 4, Insufficient Data 11
Volcanic Activity0 of 15Insufficient Data 15
Wildfire0 of 15Insufficient Data 15
Winter Weather0 of 15Insufficient Data 15

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.

Each jurisdiction (starting figures from federal data)

Sources: 1, 3, 4, 6

JurisdictionTypePlan statusRepetitive lossFMA RL and SRL (44 CFR 77.2); repeat-flood, any definitionPublic Assistance to this jurisdictionFEMA records matched by applicant name; federal share obligated, nominal dollarsEvent records naming this placeall years; since its planNotes
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

HazardBuilding exposuremodeled dollarsAgriculture exposuremodeled dollarsPopulation exposedpeopleEAL buildingsmodeled dollars per yearEAL agriculturemodeled dollars per yearCost of expected deaths and injuriesFEMA's dollar value per year, not property damageEAL as % of exposurebuildings; agriculture where notedStorm Events damage since 2024-07-01county-coded records, property plus crops, nominal dollarsZone-level damage since planproperty plus crops, reported for the zonePublic Assistance since plannominal dollars; see noteNote
Coastal Flooding$1,707,946,266n/a6,162$33,676n/a$8010.00197%$0
Cold Wave$0$00$0$0$0building exposure is 0 in NRI
Droughtn/a$0n/an/a$0n/aagriculture exposure is 0 in NRI
Earthquake$19,217,446,953n/a40,919$4,809,299n/a$2,448,9940.025%
Hail$10,932,360,002$1,512,38540,913$321$1$36under 0.0001%
Heat Wave$0$00$0$0$0$0building exposure is 0 in NRI
Hurricane$10,932,162,296$1,512,38540,913$40,589,267$17,619$1,580,7920.371%no Public Assistance recorded (2 declarations)
Inland Flooding$10,907,279,784$293,1875,973$3,656,249$2,983$181,481n/a (see note)$7,600NRI 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.
Landsliden/an/an/an/an/an/a$1,100no Public Assistance recorded (1 declaration)NRI publishes no building exposure for this county
Lightningn/an/an/an/an/an/aNRI publishes no building exposure for this county
Strong Wind$10,932,360,002$1,512,38540,913$80under $1$35under 0.0001%
Tornado$10,932,360,002$1,512,38540,913$2,795under $1$1,835under 0.0001%
Tsunami$2,396,508,307n/a769$346,949n/a$11,605,8000.0145%
Volcanic Activity$10,932,360,002n/a40,913$4n/a$979under 0.0001%
Wildfiren/an/an/an/an/an/aNRI publishes no building exposure for this county
Winter Weather$0$00$0$0$0building exposure is 0 in NRI

Totals since 2024-07-01 (Storm Events through 2026-06-30): 4 county-coded records, 4 with a damage value recorded (including $0), $8,700; 13 zone-level records, 13 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

MeasureValue
Population40,913
Building value (total, not at risk)$10,932,360,002
Agriculture value (total, not at risk)$1,512,385
NRI risk rating (all hazards)Insufficient Data
Expected annual loss, buildings and agriculture, all hazards$49,459,243
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)$15,820,754
Social vulnerability ratingData Unavailable
Community resilience ratingData Unavailable
NRI versionDecember 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

DefinitionPropertiesSevere repetitive lossProperties
Repetitive loss, FMA definition (44 CFR 77.2)1Severe repetitive loss, FMA definition (44 CFR 77.2)24
Repetitive loss, NFIP insurance definition189Severe repetitive loss, NFIP insurance definition25

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

ScopeRL, FMApropertiesSRL, FMApropertiesRL, NFIPpropertiesSRL, NFIPpropertiesAny categorypropertiesMitigatedpropertiesCurrently insuredproperties
County total12418925189010
of which: Territory of Virgin Islands (community ID not in plan data)12418925189010
Statewide, no county in FEMA's file011011000

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 groupRL, FMApropertiesSRL, FMApropertiesRL, NFIPpropertiesSRL, NFIPpropertiesAny categorypropertiesMitigatedpropertiesCurrently insuredproperties
single-family residential074074005
2 to 4 unit residential022022001
other residential011221202
non-residential1141171411702
not reported0000000

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 188 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):

  1. FEMA, OpenFEMA HazardMitigationPlanStatuses v1, version 2026-09-29T134039Z, pulled 2026-09-30, https://www.fema.gov/api/open/v1/HazardMitigationPlanStatuses (API)
  2. FEMA, OpenFEMA DisasterDeclarationsSummaries v2, version 2026-09-29T162832Z, pulled 2026-09-30, https://www.fema.gov/api/open/v2/DisasterDeclarationsSummaries (API)
  3. FEMA, OpenFEMA PublicAssistanceFundedProjectsSummaries v1, version 2026-09-29T150754Z, pulled 2026-09-30, https://www.fema.gov/api/open/v1/PublicAssistanceFundedProjectsSummaries (API)
  4. FEMA, OpenFEMA NfipMultipleLossProperties v1, version 2026-08-04T164045Z, pulled 2026-09-30, https://www.fema.gov/api/open/v1/NfipMultipleLossProperties (API)
  5. 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)
  6. 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/
  7. 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
  8. 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. Croix Island, VI: risk-assessment baseline packet, release 2026-10 (data as of 2026-09-30; County FIPS 78010). Automated baseline. https://hazardplain.org/vi/78010/ 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.