Hazard Plain Automated baseline

Jefferson Davis County, MS

Risk-assessment baseline packet

County FIPS:
28065
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 2030-04-30. Plan: MEMA District 8 Regional (FEMA plan 110507), approved 2025-05-01.

Since the plan was approved on 2025-05-01: 3 new hazard declarations (2 incidents) and 23 NOAA Storm Events records; details under "What changed since your last plan".

Highest expected annual loss (FEMA National Risk Index, modeled total; see B1-a): Inland Flooding ($1,635,053 a year), Hurricane ($903,641) and Tornado ($826,165).

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 2030-04-30
Plan:
MEMA District 8 Regional (FEMA plan 110507)
Approved:
2025-05-01
Days to expiry:
1,308

What changed since your last plan (approved 2025-05-01)

New federal declarations:
3 new hazard declarations (2 incidents): DR-4874-MS (Severe Storms, Straight-Line Winds, Tornadoes, and Flooding), EM-3640-MS (Severe Winter Storm), DR-4899-MS (Severe Winter Storm)
Storm Events records since approval:
23 records (data through 2026-06-30)
Repetitive loss now:
FMA RL 0, SRL 0 (44 CFR 77.2); any definition: 0
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 expiryNotes
Jefferson Davis County (unincorporated area)UnincorporatedApproved, expires 2030-04-30MEMA District 8 Regional (FEMA plan 110507)2025-05-012030-04-301,308this jurisdiction approved 2025-06-11
Bassfield townTownApproved, expires 2030-04-30MEMA District 8 Regional (FEMA plan 110507)2025-05-012030-04-301,308this jurisdiction approved 2025-06-11
Prentiss townTownApproved, expires 2030-04-30MEMA District 8 Regional (FEMA plan 110507)2025-05-012030-04-301,308this jurisdiction approved 2025-06-11

Plan 110507 covers 24 other participants, named in the Excel file.

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
1Inland FloodingVery LowVery Low$1,591,140$42,790$1,123$1,635,05343
2HurricaneRelatively LowRelatively Low$633,924$249,709$20,008$903,6418
3TornadoRelatively LowRelatively Low$460,036$6,743$359,385$826,16549
4Heat WaveRelatively LowRelatively Low$9$93$289,305$289,4075
5Strong WindRelatively LowRelatively Low$116,262$5,760$140,158$262,181211Includes 1 High Wind and 5 Strong Wind records (NOAA non-thunderstorm wind types, outside NRI's Strong Wind definition).
6HailRelatively LowRelatively Low$249,833$1,421$1,369$252,62382
7DroughtRelatively LowRelatively Lown/a$148,782n/a$148,78211
8Cold WaveVery LowVery Low$10,404$35,323$62,062$107,7902
9LightningRelatively LowRelatively Low$20,602n/a$66,340$86,9425
10EarthquakeVery LowVery Low$56,808n/a$23,222$80,029Storm Events does not record earthquakes.
11WildfireVery LowVery Low$31,204$185$9,118$40,5070No recorded events in Storm Events since 1996 (data through 2026-06-30).
12Ice StormRelatively LowRelatively Low$30,238n/a$5,502$35,7403
13Winter WeatherVery LowRelatively Low$2,045$3$10,299$12,34611Includes 1 Sleet record (outside NRI's Winter Weather definition).
14LandslideVery LowVery Low$419n/a$50$4690No 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 wildfire and landslide 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, coastal flooding, tsunami and volcanic activity. 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, Ice Storm, Lightning, Strong Wind and Winter Weather.

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
Earthquaketract 9501.02 (Relatively Low, 56.2); tract 9502.02 (Relatively Low, 54.8); tract 9502.01 (Relatively Low, 50.8)
Hurricanetract 9502.02 (Relatively Moderate, 89.4); tract 9502.01 (Relatively Moderate, 88.3); tract 9501.02 (Relatively Moderate, 88.1)
Landslidetract 9502.02 (Relatively Low, 89.1); tract 9501.02 (Relatively Low, 82.0); tract 9501.01 (Very Low, 80.7)
Tornadotract 9502.02 (Relatively High, 91.5); tract 9501.02 (Relatively High, 91.5); tract 9502.01 (Relatively High, 83.5)
Wildfiretract 9502.02 (Relatively Moderate, 89.3); tract 9502.01 (Relatively Low, 87.1); tract 9501.02 (Relatively Low, 83.6)

Up to 3 census tracts per hazard, highest National Risk Index rating first, then highest score; a tract number is the Census tract number (for example 9501.02 is Census Tract 9501.02). 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
Cold/Wind Chill, Extreme Cold/Wind Chillwind chill2 records, 2010 to 2026 (2 zone-level)1 day to 14 days (median 7.5 days); 2 with a recorded value14 consecutive days, 2010-01-01 to 2010-01-14, zone-levelCountywide (zone-level records).
Frost/Freeze (outside NRI's Cold Wave definition)crop damage0
DroughtU.S. Drought Monitor scale (D0 to D4)11 records, 2006 to 2026 (11 zone-level)16 days to 71 days (median 26.5 days); 6 with a recorded value71 days (about 2.3 months), 2007-04-25 to 2007-07-04, a run of 4 consecutive Storm Events drought records, zone-levelDrought, 2007-06-01, $0 property; $900,000 crops (zone total, 2007 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)93 records, 1972 to 20260.75 in to 2.5 in (median 1 in); 93 with a recorded value2.5 in hail, 2023-03-26Hail, 1996-03-18, $200,000 property; crops not reported (1996 dollars)Event records naming jurisdictions in the plan: Bassfield town (22 records), Prentiss town (19 records).
Excessive Heat, Heatheat index (in event narratives)5 records, 2005 to 2010 (5 zone-level)4 days to 12 days (median 5 days); 5 with a recorded value12 consecutive days, 2007-08-05 to 2007-08-16, zone-levelCountywide (zone-level records).
Hurricane, Tropical Storm, Tropical DepressionSaffir-Simpson8 records, 2003 to 2024 (8 zone-level)Strongest recorded: Hurricane record (NOAA event type 'Hurricane (Typhoon)'), 2005-08-29, $115,000,000 property; $50,000,000 crops (2005 dollars); NWS zone MSZ064Countywide (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.
Ice StormSperry-Piltz ice scale (local data)3 records, 2011 to 2021 (3 zone-level)Ice Storm, 2011-02-03, $400,000 property; $0 crops (2011 dollars); NWS zone MSZ064Countywide (zone-level records).
Flash Flood, Flood, Lakeshore Flooddamage and flood days (flood depth: FIRM)43 records, 1997 to 2026Flash Flood, 2010-08-13, $200,000 property; $0 crops (2010 dollars)Event records naming jurisdictions in the plan: Prentiss town (12 records), Bassfield town (10 records).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)0
Lightningannualized frequency (the measure FEMA's Local Mitigation Planning Handbook names)5 records, 2005 to 2017Lightning, 2005-08-12, $300,000 property; crops not reported (2005 dollars)Event records naming jurisdictions in the plan: Prentiss town (2 records), Bassfield town (1 record).Storm Events lists lightning with damage or casualties.
High Wind and Strong Wind (outside NRI's Strong Wind definition)wind speed (kt and mph)6 records, 1998 to 2025 (6 zone-level)39 kt (45 mph) to 43 kt (49 mph) (median 40 kt (46 mph)); 5 with a recorded value43 kt (49 mph) estimated gust, Strong Wind, 2009-07-28; NWS zone MSZ064Strong Wind, 2011-09-04, $25,000 property; $0 crops (zone total, 2011 dollars)Countywide (zone-level records).
Thunderstorm Windwind speed (kt and mph)230 records, 1970 to 202635 kt (40 mph) to 96 kt (110 mph) (median 52 kt (60 mph)); 179 with a recorded value96 kt (110 mph) estimated gust, Thunderstorm Wind, 2024-05-13Event records naming jurisdictions in the plan: Prentiss town (60 records), Bassfield town (48 records).
TornadoEnhanced Fujita (Fujita before Feb 2007)57 records, 1961 to 2026F/EF0 to F/EF4 (median F/EF1); 57 with a recorded valueEF4 tornado, 2020-04-12, 9.99 mi within this county, 2,640 yd wide, $18,000,000 property; $2,500,000 crops (2020 dollars), 4 direct deaths, 4 direct injuriesEvent records naming jurisdictions in the plan: Bassfield town (15 records), Prentiss town (6 records).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).
Wildfireacres burned (local data)0
Winter Storm, Heavy Snow, Blizzard, Lake-Effect Snow, Winter Weather, Sleetnone in data (snowfall: local data)11 records, 2008 to 2025 (11 zone-level)Heavy Snow, 2010-02-11, $600,000 property; $0 crops (2010 dollars); NWS zone MSZ064Countywide (zone-level records).

In event narratives only (local data needed): wind chill, temperature, heat index, ice thickness, acres burned and snow depth; any physical measure of debris flow and lightning.

Storm Events records are more complete after 1996; before 1996 only Tornado (from 1950), Hail and Thunderstorm Wind (from 1955) exist. Zone-level records from zones that 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.

Supports FEMA checklist item B1-d: previous occurrences

Federal declarations for this county: 33 declarations covering 25 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
2026-02-062026-01-23DR-4899-MSMajor disasterSevere Winter StormWinter Weathernone placed in this county by FEMA's record; $103,887.07 for this declaration is not placed in any county (see the state page)new since last plan; within last 5 years
2026-01-242026-01-23EM-3640-MSEmergencySevere Winter StormWinter Weatherno Public Assistance recordednew since last plan; within last 5 yearssame incident as DR-4899
2025-05-212025-03-14DR-4874-MSMajor disasterSevere Storms, Straight-Line Winds, Tornadoes, and FloodingInland Flooding; Strong Wind; Tornado$1,441,588.31new since last plan; within last 5 years
2023-08-122023-06-14DR-4727-MSMajor disasterSevere Storms, Straight-Line Winds, and Tornadoes.Strong Wind; Tornado$11,499.74within last 5 years
2021-10-222021-08-28DR-4626-MSMajor disasterHurricane IdaHurricaneno Public Assistance recordedwithin last 5 years
2021-08-282021-08-28EM-3569-MSEmergencyHurricane IdaHurricaneno Public Assistance recordedsame incident as DR-4626
2021-05-042021-02-11DR-4598-MSMajor disasterSevere Winter StormsIce Storm$9,384.61
2020-10-082020-10-07EM-3548-MSEmergencyHurricane DeltaHurricaneno Public Assistance recorded
2020-09-142020-09-14EM-3544-MSEmergencyHurricane SallyHurricaneno Public Assistance recorded
2020-08-232020-08-23EM-3539-MSEmergencyHurricane Marco and Tropical Storm LauraHurricaneno Public Assistance recorded
2020-07-092020-04-22DR-4551-MSMajor disasterSevere Storms, Tornadoes, Straight-Line Winds, and FloodingInland Flooding; Strong Wind; Tornado$1,686,887.49
2020-04-162020-04-12DR-4536-MSMajor disasterSevere Storms, Tornadoes, Straight-Line Winds, and FloodingInland Flooding; Strong Wind; Tornado$3,369,311.52
2020-04-052020-01-20DR-4528-MSMajor disasterCOVID-19 PandemicNon-natural, not counted$110,657.10
2020-03-132020-01-20EM-3474-MSEmergencyCOVID-19Non-natural, not countedno Public Assistance recordedsame incident as DR-4528
2019-12-062019-10-26DR-4470-MSMajor disasterSevere Storm, Straight-Line Winds, and FloodingInland Flooding; Strong Wind$51,542.83
2016-03-252016-03-09DR-4268-MSMajor disasterSevere Storms and FloodingInland Flooding$43,125.77
2013-02-132013-02-10DR-4101-MSMajor disasterSevere Storms, Tornadoes, and FloodingInland Flooding; TornadoPA not declared for this county
2012-08-292012-08-26DR-4081-MSMajor disasterHurricane IsaacHurricane$9,370.42
2012-08-282012-08-26EM-3348-MSEmergencyTropical Storm IsaacHurricaneno Public Assistance recordedsame incident as DR-4081
2009-05-122009-03-25DR-1837-MSMajor disasterSevere Storms, Flooding, and TornadoesInland Flooding; Tornado$89,472.58
2008-09-222008-08-28DR-1794-MSMajor disasterHurricane GustavHurricaneno Public Assistance recorded
2008-08-302008-08-28EM-3291-MSEmergencyHurricane GustavHurricaneno Public Assistance recordedsame incident as DR-1794
2005-08-292005-08-29DR-1604-MSMajor disasterHurricane KatrinaHurricane$4,357,879.17
2005-08-282005-08-27EM-3213-MSEmergencyHurricane KatrinaHurricaneno Public Assistance recordedsame incident as DR-1604
2005-07-102005-07-10DR-1594-MSMajor disasterHurricane DennisHurricaneno Public Assistance recorded
2004-09-152004-09-13DR-1550-MSMajor disasterHurricane IvanHurricane$5,038.55
2003-04-242003-04-06DR-1459-MSMajor disasterSevere Storms, Tornadoes, FloodsInland Flooding; TornadoPA not declared for this county
1998-10-011998-09-25DR-1251-MSMajor disasterHurricane GeorgesHurricanePA not declared for this county
1998-09-281998-09-28EM-3132-MSEmergencyHurricane GeorgesHurricaneno Public Assistance recordedsame incident as DR-1251
1992-11-251992-11-21DR-968-MSMajor disasterSevere Storms, High Winds & TornadoesTornado (primary); also designated: Strong Windno Public Assistance recorded
1977-02-221977-02-22EM-3032-MSEmergencyDrought & FreezingWinter Weather (primary); also designated: Droughtno Public Assistance recorded
1974-04-181974-04-18DR-430-MSMajor disasterHeavy Rains & FloodingInland Floodingno Public Assistance recorded
1969-08-181969-08-18DR-271-MSMajor disasterHurricane CamilleHurricane (primary); also designated: Inland Floodingno 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
1962-10-101962-10-10DR-135-MSMajor disasterChlorine Barge AccidentNon-natural, not counted
1961-02-271961-02-27DR-108-MSMajor disasterFloodsInland Flooding
1953-12-061953-12-06DR-14-MSMajor disasterTornadoTornado

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.

Public Assistance not placed in any Mississippi county: 3 rows, $3,519,904.13; listed on the Mississippi state page.

Source: 3

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
Cold Wave2101001996 to 2026-06-30
Drought11104101996 to 2026-06-30
Earthquake000000Storm Events does not record earthquakes; the USGS earthquake catalog is the source.
Hail93209001955 to 2026-06-30
Heat Wave5000001996 to 2026-06-30
Hurricane80111101996 to 2026-06-30
Ice Storm3000101996 to 2026-06-30
Inland Flooding431051011996 to 2026-06-30
Landslide0000001996 to 2026-06-30No recorded events, 1996 to 2026-06-30, NOAA NCEI Storm Events
Lightning5000001996 to 2026-06-30
Strong Wind23691841611955 to 2026-06-30Includes 1 High Wind and 5 Strong Wind records.
Tornado579824811950 to 2026-06-30
Wildfire0000001996 to 2026-06-30No recorded events, 1996 to 2026-06-30, NOAA NCEI Storm Events
Winter Weather11011211996 to 2026-06-30Includes 1 Sleet record.

Notable Storm Events records

Sources: 1, 6, 7

DateEvent typeMagnitude or extentDamagenominal dollarsDeaths, injuriesdirect onlyLocationFlagsWhy listed
2025-03-15TornadoEF3, 18.82 mi within this county, 1,400 yd wide$0 property; $0 crops (2025 dollars)2, 2HATHORN to TERRELLin the 12 months before plan approval; within last 5 yearsdeaths or injuries recorded
2024-05-13Thunderstorm Wind96 kt (110 mph) estimated gust$250,000 property; $0 crops (2024 dollars)0, 0OAK VALE to HATHORNin the 12 months before plan approval; within last 5 yearsB1-c worst recorded: Thunderstorm Wind
2023-03-26Hail2.5 in$150,000 property; $0 crops (2023 dollars)0, 0PRENTISSwithin last 5 yearsB1-c worst recorded: Hail
2020-04-12TornadoEF4, 9.99 mi within this county, 2,640 yd wide$18,000,000 property; $2,500,000 crops (2020 dollars)4, 4BASSFIELD to TERRELLdeaths or injuries recorded
2010-08-13Flash Flood$200,000 property; $0 crops (2010 dollars)0, 0PRENTISSB1-c worst recorded: Flash Flood, Flood, Lakeshore Flood
2010-01-01Cold/Wind Chill$200,000 property; $0 crops (zone total, 2010 dollars)0, 0NWS zone MSZ064 (JEFFERSON DAVIS), zone-levelB1-c worst recorded: Cold/Wind Chill, Extreme Cold/Wind Chill
2009-07-28Strong Wind43 kt (49 mph) estimated gust$1,500 property; $0 crops (zone total, 2009 dollars)0, 0NWS zone MSZ064 (JEFFERSON DAVIS), zone-levelB1-c worst recorded: High Wind and Strong Wind
2007-08-05Heat$0 property; $0 crops (zone total, 2007 dollars)0, 0NWS zone MSZ064 (JEFFERSON DAVIS), zone-levelB1-c worst recorded: Excessive Heat, Heat
2007-04-25Drought$0 property; $0 crops (zone total, 2007 dollars)0, 0NWS zone MSZ064 (JEFFERSON DAVIS), zone-levelB1-c worst recorded: Drought
2005-08-29Hurricane (NOAA event type 'Hurricane (Typhoon)')$115,000,000 property; $50,000,000 crops (zone total, 2005 dollars)0, 0NWS zone MSZ064 (JEFFERSON DAVIS), zone-levelB1-c worst recorded: Hurricane, Tropical Storm, Tropical Depression
2005-08-12Lightning$300,000 property; crops not reported (2005 dollars)0, 0BASSFIELDB1-c worst recorded: Lightning
1992-11-21TornadoF3, 15 mi path length (whole path, pre-1996), 880 yd wide$2,500,000 property; crops not recorded (1992 dollars)0, 5location not recordeddeaths or injuries recorded

The full list is in the Excel file, sheet "B1-d Storm Events history" (474 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).

Tribal and special-area declarations in this state are listed on the state page.

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
Cold Wave0.737event-days per yearabout 0.737 days per yearPossibleStorm Events event-days in 1 of 30 years, 1996 to 2025 (3.33%)142005-11-12 to 2024-11-12 (19 years)countywide
Drought10.4event-days per yearabout 10.4 days per yearLikelyStorm Events event-days in 5 of 30 years, 1996 to 2025 (16.7%)3432000 to 2025 (25.25 years; D3 and D4 only)countywide
Earthquake0.00116annual probability at a locationchance a given location in the county has at least minor-damage shaking in a year: 0.116%not shownmodeledsee B1-fNo descriptor (Storm Events does not record earthquakes).
Hail4.16events per yearabout 4.16 per yearHighly likelyFEMA annualized frequency (modeled)157.9 (modeled)1986 to 2023 (38 years)countywide
Heat Wave12.8event-days per yearabout 12.8 days per yearLikelyStorm Events event-days in 4 of 30 years, 1996 to 2025 (13.3%)1982005-11-12 to 2024-11-12 (19 years)countywide
Hurricane0.128events per yearabout 1 in 8 yearsLikelyFEMA annualized frequency (modeled)391851 to 2024 (Atlantic)see B1-fNRI counts hurricane and tropical storm tracks passing within storm-force wind range; federal declarations are in B1-d.
Ice Storm0.957event-days per yearabout 0.957 days per yearPossibleStorm Events event-days in 2 of 30 years, 1996 to 2025 (6.67%)651946-12-31 to 2014-02-12 (67 years)countywide
Inland Flooding1event-day per yearabout 1 day per yearLikelyStorm Events event-days in 18 of 30 years, 1996 to 2025 (60%)281996 to 2023 (28 years)see B1-f
Landslide0.265events per year (modeled)about 1 in 4 yearsLikelyFEMA annualized frequency (modeled)not shownmodeledsee B1-f
Lightning76.6days per year with a strikeabout 76.6 days per yearHighly likelyFEMA annualized frequency (modeled)not shown1995 to 2023 (29 years; CONUS)countywide
Strong Wind3.28events per yearabout 3.28 per yearHighly likelyFEMA annualized frequency (modeled)1251986 to 2023 (38 years)countywide
Tornado0.57events per yearabout 0.57 per yearLikelyFEMA annualized frequency (modeled)not shown1950 to 2023 (EF2+); 1986 to 2023 (EF0-1)see B1-f
Wildfire0.00228annual probability at a locationchance a given location in the county burns in a year: 0.228%Storm Events records in 0 of 30 years, 1996 to 2025 (0%)not shownmodeledsee B1-fNo descriptor: no Storm Events record 1996 to 2025
Winter Weather1.68event-days per yearabout 1.68 days per yearLikelyStorm Events event-days in 9 of 30 years, 1996 to 2025 (30%)322005-11-12 to 2024-11-12 (19 years)countywide

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.

Where NRI gives event-days, the descriptor comes from the share of years with a Storm Events record; NRI's source records more events, so the two differ.

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 202542301.4
Hail2.00 in+1996 to 20251300.0333
Thunderstorm Wind (counted as NRI Strong Wind)50-64 kt1996 to 2025152305.07
Thunderstorm Wind (counted as NRI Strong Wind)65 kt+1996 to 202511300.367
Thunderstorm Wind (counted as NRI Strong Wind)unmeasured or below 50 kt1996 to 202533301.1
TornadoEF0-11996 to 202533301.1
TornadoEF2-31996 to 20256300.2
TornadoEF4-51996 to 20251300.0333
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
Cold Wave4 of 434.546.250.9Relatively Moderate 1, Relatively Low 3
Drought3 of 490.092.997.0Relatively Moderate 2, Relatively Low 1, No Rating 1
Earthquake4 of 435.852.856.2Relatively Low 3, Very Low 1
Hail4 of 482.991.093.1Relatively High 3, Relatively Moderate 1
Heat Wave4 of 466.883.385.4Relatively High 1, Relatively Moderate 3
Hurricane4 of 482.488.289.4Relatively Moderate 4
Ice Storm4 of 462.875.983.0Relatively Moderate 3, Relatively Low 1
Inland Flooding4 of 420.855.969.0Relatively Moderate 2, Relatively Low 2
Landslide4 of 480.181.389.1Relatively Low 2, Very Low 2
Lightning4 of 465.385.388.4Relatively High 3, Relatively Moderate 1
Strong Wind4 of 481.491.793.5Relatively High 3, Relatively Moderate 1
Tornado4 of 471.587.591.5Relatively High 3, Relatively Moderate 1
Wildfire4 of 483.585.389.3Relatively Moderate 1, Relatively Low 3
Winter Weather4 of 450.966.869.9Relatively Moderate 4

Drought: Agriculture is all of NRI's expected annual loss for this hazard in the county, so the tract range mostly reflects where crop and livestock value is.

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.

Frequency data for cold wave, drought, hail, heat wave, ice storm, lightning, strong wind and winter weather are county-wide or coarse (49 km grid or NWS zone), the same for every jurisdiction; the tract range mostly reflects where buildings and people are (crop and livestock value where a line above names agriculture).

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
Jefferson Davis County (unincorporated area)UnincorporatedApproved, expires 2030-04-30FMA RL 0, SRL 0; any 0$10,827,741.290 total; 0 since its planIncludes $110,657.10 for declarations not counted as hazard incidents (DR-4528-MS).
Bassfield townTownApproved, expires 2030-04-30FMA RL 0, SRL 0; any 0$67,473.5296 total; 6 since its plan
Prentiss townTownApproved, expires 2030-04-30FMA RL 0, SRL 0; any 0$75,947.9799 total; 3 since its plan

Repetitive-loss counts are for whole NFIP communities, which can extend beyond this county (see the note in B2-c).

County Public Assistance in B1-d also includes applicants filed under the county that are not jurisdictions in this plan (for example state agencies, special districts and nonprofits), so the jurisdiction rows add up to less.

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 2025-05-01county-coded records, property plus crops, nominal dollarsZone-level damage since planproperty plus crops, reported for the zonePublic Assistance since plannominal dollars; see noteNote
Cold Wave$2,171,707,464$61,593,58311,298$10,404$35,323$62,0620.000479%$0
Droughtn/a$1,932,930n/an/a$148,782n/a7.7% (agriculture)$0NRI has no building exposure for this hazard; agriculture shown
Earthquake$3,770,248,753n/a11,321$56,808n/a$23,2220.00151%
Hail$2,171,707,464$61,593,58311,298$249,833$1,421$1,3690.0115%$0
Heat Wave$2,171,707,464$61,593,58311,298$9$93$289,305under 0.0001%
Hurricane$2,171,707,464$61,593,58311,298$633,924$249,709$20,0080.0292%
Ice Storm$2,171,707,464n/a11,298$30,238n/a$5,5020.00139%
Inland Flooding$2,170,654,189$5,710,949163$1,591,140$42,790$1,123n/a (see note)$5,000$1,441,588.31NRI 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$28,904,920n/a167$419n/a$500.00145%
Lightning$2,171,707,464n/a11,298$20,602n/a$66,3400.000949%
Strong Wind$2,171,707,464$61,593,58311,298$116,262$5,760$140,1580.00535%$24,000$1,441,588.31
Tornado$2,171,707,464$61,593,58311,298$460,036$6,743$359,3850.0212%$320,000$1,441,588.31
Wildfire$139,280,911$11,315,1352,604$31,204$185$9,1180.0224%
Winter Weather$2,171,707,464$61,593,58311,298$2,045$3$10,299under 0.0001%no Public Assistance recorded (2 declarations)

Totals since 2025-05-01 (Storm Events through 2026-06-30): 21 county-coded records, 21 with a damage value recorded (including $0), $349,000; 2 zone-level records, 2 with a damage value recorded (including $0), $0 reported for the zone; Public Assistance: $1,441,588.31 on 3 counted declarations, 1 of them with Public Assistance.

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
Population11,298
Building value (total, not at risk)$2,171,707,464
Agriculture value (total, not at risk)$61,593,583
NRI risk rating (all hazards)Very Low
Expected annual loss, buildings and agriculture, all hazards$3,693,732
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)$987,943
Social vulnerability ratingVery High
Community resilience ratingRelatively Low
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)0Severe repetitive loss, FMA definition (44 CFR 77.2)0
Repetitive loss, NFIP insurance definition0Severe repetitive loss, NFIP insurance definition0

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 total0000000
Statewide, no county in FEMA's file1141403

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.

Repeat-flood properties by jurisdiction in the plan (NFIP community)

Sources: 1, 4

JurisdictionNFIP community IDRL, FMApropertiesSRL, FMApropertiesRL, NFIPpropertiesSRL, NFIPpropertiesAny categorypropertiesMitigatedpropertiesCurrently insuredproperties
Jefferson Davis County (unincorporated area)2803030000000
Bassfield town2800890000000
Prentiss town2800900000000

Counts by occupancy group for each jurisdiction are in the Excel file, sheet "B2-c Jurisdictions".

Jurisdiction rows are whole NFIP communities and need not add up to the county total: a community that extends into another county is counted in full on each jurisdiction row, while the county table counts only its part in this county.

County repeat-flood properties by occupancy group: 0 in every occupancy group.

Sources: 1, 4

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 0 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 (the summary on page 1 says how it is organized); the plan and FEMA's review decide whether each 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). Jefferson Davis County, MS: risk-assessment baseline packet, release 2026-10 (data as of 2026-09-30; County FIPS 28065). Automated baseline. https://hazardplain.org/ms/28065/ 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