Hazard Plain Automated baseline

Adams County, MS

Risk-assessment baseline packet

County FIPS:
28001
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 2029-02-12. Plan: MEMA District 7 Regional (FEMA plan 109196), approved 2024-02-13.

Since the plan was approved on 2024-02-13: 2 new hazard declarations (1 incident): EM-3640-MS (Severe Winter Storm), DR-4899-MS (Severe Winter Storm).

NOAA Storm Events records since that date: 36 records (data through 2026-06-30).

Highest expected annual loss (FEMA National Risk Index, modeled total; see B1-a): Inland Flooding ($5,626,931 a year), Tornado ($2,804,328) and Heat Wave ($1,295,079).

Repetitive-loss flood properties now: FMA RL 2, SRL 2 (44 CFR 77.2); any definition: 24.

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 2029-02-12
Plan:
MEMA District 7 Regional (FEMA plan 109196)
Approved:
2024-02-13
Days to expiry:
866

What changed since your last plan (approved 2024-02-13)

New federal declarations:
2 new hazard declarations (1 incident): EM-3640-MS (Severe Winter Storm), DR-4899-MS (Severe Winter Storm)
Storm Events records since approval:
36 records (data through 2026-06-30)
Repetitive loss now:
FMA RL 2, SRL 2 (44 CFR 77.2); any definition: 24
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
Adams CountyCountyApproved, expires 2029-02-12MEMA District 7 Regional (FEMA plan 109196)2024-02-132029-02-12866this jurisdiction approved 2024-04-16
Natchez cityCityApproved, expires 2029-02-12MEMA District 7 Regional (FEMA plan 109196)2024-02-132029-02-12866this jurisdiction approved 2024-04-16

Plan 109196 covers 26 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 FloodingRelatively LowRelatively Low$5,537,164$85,945$3,822$5,626,93145
2TornadoRelatively ModerateRelatively Moderate$757,083$1,274$2,045,971$2,804,32811
3Heat WaveRelatively ModerateRelatively Low$92$44$1,294,943$1,295,0795
4Cold WaveRelatively LowRelatively Low$34,228$5,605$729,966$769,7992
5HurricaneRelatively LowRelatively Low$594,084$31,084$31,711$656,8798
6Strong WindRelatively ModerateRelatively Low$200,637$24,708$263,048$488,393217Includes 4 High Wind and 17 Strong Wind records (NOAA non-thunderstorm wind types, outside NRI's Strong Wind definition).
7HailRelatively LowRelatively Low$375,181$1,574$4,847$381,60254
8EarthquakeVery LowVery Low$119,345n/a$33,314$152,659Storm Events does not record earthquakes.
9LightningRelatively LowRelatively Low$9,380n/a$139,660$149,0402
10Ice StormRelatively ModerateRelatively Low$74,423n/a$29,281$103,7037
11DroughtRelatively LowRelatively Lown/a$81,227n/a$81,2279
12WildfireVery LowVery Low$14,708$5$3,519$18,2310No recorded events in Storm Events since 1996 (data through 2026-06-30).
13Winter WeatherVery LowVery Low$5,976$12$2,178$8,16613Includes 4 Sleet records (outside NRI's Winter Weather definition).
14LandslideRelatively LowVery Low$4,442n/a$256$4,6980Declared 1 time; no Storm Events record of this type.

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 9 (Relatively Low, 58.4); tract 7 (Relatively Low, 55.9); tract 8 (Relatively Low, 55.4)
Hurricanetract 8 (Relatively Moderate, 82.0); tract 9 (Relatively Moderate, 81.6); tract 7 (Relatively Low, 77.9)
Landslidetract 8 (Relatively Low, 94.7); tract 2 (Relatively Low, 93.5); tract 1.01 (Relatively Low, 93.4)
Tornadotract 9 (Very High, 96.2); tract 8 (Very High, 94.6); tract 1.01 (Very High, 94.4)
Wildfiretract 8 (Relatively Low, 79.8); tract 1.02 (Relatively Low, 79.5); tract 1.01 (Relatively Low, 78.0)

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 9 is Census Tract 9). 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)2 days to 14 days (median 8 days); 2 with a recorded value14 consecutive days, 2010-01-01 to 2010-01-14, 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)9 records, 2006 to 2026 (9 zone-level)16 days to 93 days (median 26.5 days); 6 with a recorded value93 days (about 3.1 months), 2023-08-01 to 2023-11-01, a run of 4 consecutive Storm Events drought records, zone-levelDrought, 2023-11-01, $0 property; $2,100,000 crops, reported for the zone (2023 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)75 records, 1961 to 20260.75 in to 2.75 in (median 1 in); 75 with a recorded value2.75 in hail, 1983-04-06Hail, 2024-04-02, $300,000 property; $0 crops (2024 dollars)Event records naming jurisdictions in the plan: Natchez city (18 records).
Excessive Heat, Heatheat index (in event narratives)5 records, 2000 to 2010 (5 zone-level)1 day 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).Heat index: in event narratives only (local data needed).
Hurricane, Tropical Storm, Tropical DepressionSaffir-Simpson8 records, 2002 to 2021 (8 zone-level)Strongest recorded: Hurricane (Typhoon) record (NOAA's event type name), 2005-08-29, $100,000,000 property; $20,000,000 crops (2005 dollars) (as recorded; larger than this county's annual agriculture value in the National Risk Index (the county or state extension service keeps crop loss records)), 2 direct injuries (reported for the zone); NWS zone MSZ060Countywide (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)7 records, 1996 to 2026 (7 zone-level)Ice Storm, 2011-02-03, $400,000 property; $0 crops (2011 dollars); NWS zone MSZ060Countywide (zone-level records).Ice thickness: in event narratives only (local data needed).
Flash Flood, Flood, Lakeshore Flooddamage and flood days (flood depth: FIRM)45 records, 1997 to 2026 (1 zone-level)Flash Flood, 2008-09-02, $2,000,000 property; $4,000,000 crops (2008 dollars)Event records naming jurisdictions in the plan: Natchez city (19 records). Zone-level records (1) 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)0Physical measure: in event narratives only (local data needed).
Lightningannualized frequency (the measure FEMA's Local Mitigation Planning Handbook names)2 records, 2007 to 2010Lightning, 2007-08-27, $150,000 property; $0 crops (2007 dollars)Event records naming jurisdictions in the plan: Natchez city (1 record).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)21 records, 1996 to 2025 (21 zone-level)35 kt (40 mph) to 48 kt (55 mph) (median 42 kt (48 mph)); 19 with a recorded value48 kt (55 mph) estimated gust, Strong Wind, 2019-07-14; NWS zone MSZ060Strong Wind, 2012-02-23, $75,000 property; $0 crops, reported for the zone (2012 dollars)Countywide (zone-level records).
Thunderstorm Windwind speed (kt and mph)241 records, 1957 to 202640 kt (46 mph) to 78 kt (90 mph) (median 51.5 kt (59 mph)); 180 with a recorded value78 kt (90 mph) estimated gust, Thunderstorm Wind, 2009-05-03; same speed and measurement basis also recorded on 2008-12-09Thunderstorm Wind, 1998-02-26, $30,000,000 property; crops not reported (1998 dollars)Event records naming jurisdictions in the plan: Natchez city (92 records).
TornadoEnhanced Fujita (Fujita before Feb 2007)20 records, 1950 to 2022F/EF0 to F/EF2 (median F/EF1); 19 with a recorded valueF2 tornado, 1982-04-03, 33 yd wide, $250 property; crops not recorded (1982 dollars), 40 direct injuriesTornado, 1987-03-17, $2,500,000 property; crops not recorded (1987 dollars)Event records naming jurisdictions in the plan: Natchez city (4 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)0Acres burned: in event narratives only (local data needed).
Winter Storm, Heavy Snow, Blizzard, Lake-Effect Snow, Winter Weather, Sleetnone in data (snowfall: local data)13 records, 2008 to 2026 (13 zone-level)Heavy Snow, 2010-02-11, $600,000 property; $0 crops (2010 dollars); NWS zone MSZ060Countywide (zone-level records).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.

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

DeclaredIncident beganFEMA numberTypeTitleMapped hazardCounty Public Assistancefederal share obligated, nominal dollarsFlagsNotes
2026-02-062026-01-23DR-4899-MSMajor disasterSevere Winter StormWinter Weather$321,074.30new 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
2023-08-122023-06-14DR-4727-MSMajor disasterSevere Storms, Straight-Line Winds, and Tornadoes.Strong Wind; Tornadono Public Assistance recordedin the 12 months before plan approval; within 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$2,586,406.75
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
2020-04-052020-01-20DR-4528-MSMajor disasterCOVID-19 PandemicNon-natural, not counted$36,494.81
2020-03-132020-01-20EM-3474-MSEmergencyCOVID-19Non-natural, not countedno Public Assistance recordedsame incident as DR-4528
2017-05-222017-04-30DR-4314-MSMajor disasterSevere Storms, Tornadoes, Straight-Line Winds, and FloodingInland Flooding; Strong Wind; Tornado$106,367.81
2012-08-292012-08-26DR-4081-MSMajor disasterHurricane IsaacHurricane$112,848.66
2011-05-112011-05-03DR-1983-MSMajor disasterFloodingInland Flooding$377,294.03
2011-05-042011-04-27EM-3320-MSEmergencyFloodingInland Floodingno Public Assistance recordedsame incident as DR-1983
2008-09-222008-08-28DR-1794-MSMajor disasterHurricane GustavHurricane$501,650.73
2008-08-302008-08-28EM-3291-MSEmergencyHurricane GustavHurricaneno Public Assistance recordedsame incident as DR-1794
2005-08-292005-08-29DR-1604-MSMajor disasterHurricane KatrinaHurricane$322,220.91
2004-09-152004-09-13DR-1550-MSMajor disasterHurricane IvanHurricaneno Public Assistance recorded
1991-03-051991-02-17DR-895-MSMajor disasterSevere Storms & FloodingInland Floodingno Public Assistance recorded
1990-02-281990-01-24DR-859-MSMajor disasterSevere Storms, Tornadoes & FloodingInland Flooding; Tornadono Public Assistance recorded
1980-04-191980-04-19DR-618-MSMajor disasterStorms, Flood, Mudslides & TornadoesInland Flooding; Landslide; Tornadono Public Assistance recorded
1979-04-161979-04-16DR-577-MSMajor disasterStorms, Tornadoes, FloodsInland Flooding; Tornadono 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
1973-03-271973-03-27DR-368-MSMajor disasterHeavy Rains, Tornadoes & FloodingInland Flooding; Tornadono Public Assistance recorded
1965-09-251965-09-25DR-210-MSMajor disasterHurricane BetsyHurricane (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
Drought9145101996 to 2026-06-30
Earthquake000000Storm Events does not record earthquakes; the USGS earthquake catalog is the source.
Hail756212001955 to 2026-06-30
Heat Wave5000001996 to 2026-06-30
Hurricane8000901996 to 2026-06-30
Ice Storm7101101996 to 2026-06-30
Inland Flooding45204901996 to 2026-06-30
Landslide0000101996 to 2026-06-30No Storm Events records of this type; 1 federal declared incident (see declarations table)
Lightning2000001996 to 2026-06-30
Strong Wind26223634201955 to 2026-06-30Includes 4 High Wind and 17 Strong Wind records.
Tornado20001601950 to 2026-06-30
Wildfire0000001996 to 2026-06-30No recorded events, 1996 to 2026-06-30, NOAA NCEI Storm Events
Winter Weather13202211996 to 2026-06-30Includes 4 Sleet records.

Notable Storm Events records

Sources: 1, 6, 7

DateEvent typeMagnitude or extentDamagenominal dollarsDeaths, injuriesdirect onlyLocationFlagsWhy listed
2025-10-26Flash Flood$2,000 property; $0 crops (2025 dollars)1, 1NATCHEZnew since last plan; within last 5 yearsdeaths or injuries recorded
2024-12-28Thunderstorm Wind52 kt (60 mph) estimated gust$150,000 property; $0 crops (2024 dollars)1, 1NATCHEZnew since last plan; within last 5 yearsdeaths or injuries recorded
2019-07-14Strong Wind48 kt (55 mph) estimated gust$10,000 property; $0 crops, reported for the zone (2019 dollars)0, 0NWS zone MSZ060 (ADAMS), zone-levelB1-c worst recorded: High Wind and Strong Wind
2010-01-01Cold/Wind Chill$350,000 property; $0 crops, reported for the zone (2010 dollars)0, 0NWS zone MSZ060 (ADAMS), zone-levelB1-c worst recorded: Cold/Wind Chill, Extreme Cold/Wind Chill
2009-05-03Thunderstorm Wind78 kt (90 mph) estimated gust$2,000,000 property; $800,000 crops (2009 dollars)0, 0NATCHEZ to LEESDALEB1-c worst recorded: Thunderstorm Wind
2008-09-02Flash Flood$2,000,000 property; $4,000,000 crops (2008 dollars)0, 0SIBLEY to FOSTERB1-c worst recorded: Flash Flood, Flood, Lakeshore Flood
2007-08-27Lightning$150,000 property; $0 crops (2007 dollars)0, 0NATCHEZB1-c worst recorded: Lightning
2007-08-05Heat$0 property; $0 crops, reported for the zone (2007 dollars)0, 0NWS zone MSZ060 (ADAMS), zone-levelB1-c worst recorded: Excessive Heat, Heat
2005-08-29Hurricane (Typhoon), NOAA's event type name$100,000,000 property; $20,000,000 crops, reported for the zone (2005 dollars) (as recorded; larger than this county's annual agriculture value in the National Risk Index (the county or state extension service keeps crop loss records))0, 2NWS zone MSZ060 (ADAMS), zone-levelB1-c worst recorded: Hurricane, Tropical Storm, Tropical Depression
2000-07-14Heatdamage not reported1, 0NWS zone MSZ060 (ADAMS), zone-leveldeaths or injuries recorded
1983-04-06Hail2.75 indamage not recorded (pre-1996 record)0, 0location not recordedB1-c worst recorded: Hail
1982-04-03TornadoF2, 33 yd wide$250 property; crops not recorded (1982 dollars)0, 40location not recordedB1-c worst recorded: Tornado

The full list is in the Excel file, sheet "B1-d Storm Events history" (448 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 yearPossible (from Storm Events: 1 of 30 years)event-days in 1 of 30 years, 1996 to 2025 (3.33%)142005-11-12 to 2024-11-12 (19 years)countywide
Drought13.7event-days per yearabout 13.7 days per yearLikely (from Storm Events: 5 of 30 years)event-days in 5 of 30 years, 1996 to 2025 (16.7%)4062000 to 2025 (25.25 years; D3 and D4 only)countywide
Earthquake0.00126annual probability at a locationchance a given location in the county has at least minor-damage shaking in a year: 0.126%not shownmodeledsee B1-fNo descriptor (Storm Events does not record earthquakes).
Hail2.5events per yearabout 2.5 per yearHighly likelyFEMA annualized frequency (modeled)94.5 (modeled)1986 to 2023 (38 years)countywide
Heat Wave16.4event-days per yearabout 16.4 days per yearLikely (from Storm Events: 5 of 30 years)event-days in 5 of 30 years, 1996 to 2025 (16.7%)2612005-11-12 to 2024-11-12 (19 years)countywide
Hurricane0.109events per yearabout 1 in 9 yearsLikelyFEMA annualized frequency (modeled)361851 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 Storm0.935event-days per yearabout 0.935 days per yearLikely (from Storm Events: 5 of 30 years)event-days in 5 of 30 years, 1996 to 2025 (16.7%)631946-12-31 to 2014-02-12 (67 years)countywide
Inland Flooding1.36event-days per yearabout 1.36 days per yearLikely (from Storm Events: 20 of 30 years)event-days in 20 of 30 years, 1996 to 2025 (66.7%)381996 to 2023 (28 years)see B1-f
Landslide0.443events per year (modeled)about 1 in 2 yearsLikelyFEMA annualized frequency (modeled)not shownmodeledsee B1-f
Lightning75days per year with a strikeabout 75 days per yearHighly likelyFEMA annualized frequency (modeled)not shown1995 to 2023 (29 years; CONUS)countywide
Strong Wind2.22events per yearabout 2.22 per yearHighly likelyFEMA annualized frequency (modeled)841986 to 2023 (38 years)countywide
Tornado0.432events per yearabout 1 in 2 yearsLikelyFEMA annualized frequency (modeled)not shown1950 to 2023 (EF2+); 1986 to 2023 (EF0-1)see B1-f
Wildfire0.00056annual probability at a locationchance a given location in the county burns in a year: 0.056%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 Weather2.21event-days per yearabout 2.21 days per yearLikely (from Storm Events: 8 of 30 years)event-days in 8 of 30 years, 1996 to 2025 (26.7%)422005-11-12 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 202530301
Hail2.00 in+1996 to 20250300
Thunderstorm Wind (counted as NRI Strong Wind)50-64 kt1996 to 2025153305.1
Thunderstorm Wind (counted as NRI Strong Wind)65 kt+1996 to 20257300.233
Thunderstorm Wind (counted as NRI Strong Wind)unmeasured or below 50 kt1996 to 202531301.03
TornadoEF0-11996 to 20258300.267
TornadoEF2-31996 to 20253300.1
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
Cold Wave10 of 1056.070.576.7Relatively Moderate 10
Drought6 of 1070.783.394.4Relatively Moderate 2, Relatively Low 1, Very Low 3, No Rating 4
Earthquake10 of 1024.236.258.4Relatively Low 3, Very Low 7
Hail10 of 1072.381.890.0Relatively High 2, Relatively Moderate 8
Heat Wave10 of 1079.890.993.4Relatively High 8, Relatively Moderate 2
Hurricane10 of 1066.175.682.0Relatively Moderate 2, Relatively Low 8
Ice Storm10 of 1062.575.686.8Relatively Moderate 9, Relatively Low 1
Inland Flooding10 of 1033.256.694.4Relatively High 1, Relatively Moderate 6, Relatively Low 3
Landslide10 of 1052.668.794.7Relatively Low 4, Very Low 6
Lightning10 of 1052.671.078.0Relatively High 1, Relatively Moderate 9
Strong Wind10 of 1071.783.790.8Relatively High 6, Relatively Moderate 4
Tornado10 of 1078.190.996.2Very High 3, Relatively High 7
Wildfire10 of 1023.074.679.8Relatively Low 7, Very Low 3
Winter Weather10 of 1026.032.443.7Relatively Low 10

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
Adams CountyCountyApproved, expires 2029-02-12FMA RL 1, SRL 1; any 14$2,693,108.840 total; 0 since its planIncludes $14,548.75 for declarations not counted as hazard incidents (DR-4528-MS).
Natchez cityCityApproved, expires 2029-02-12FMA RL 1, SRL 1; any 3$1,496,644.90134 total; 7 since its planIncludes $21,946.06 for declarations not counted as hazard incidents (DR-4528-MS).

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 2024-02-13county-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$5,574,752,502$9,772,74029,474$34,228$5,605$729,9660.000614%$0
Droughtn/a$6,151,268n/an/a$81,227n/a1.32% (agriculture)$0NRI has no building exposure for this hazard; agriculture shown
Earthquake$9,835,298,383n/a29,538$119,345n/a$33,3140.00121%
Hail$5,574,752,502$9,772,74029,474$375,181$1,574$4,8470.00673%$380,000
Heat Wave$5,574,752,502$9,772,74029,474$92$44$1,294,943under 0.0001%
Hurricane$5,574,488,152$9,772,74029,472$594,084$31,084$31,7110.0107%
Ice Storm$5,574,752,502n/a29,474$74,423n/a$29,2810.00133%$0
Inland Flooding$5,573,873,860$6,388,827321$5,537,164$85,945$3,822n/a (see note)$2,000NRI 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$183,433,278n/a1,027$4,442n/a$2560.00242%
Lightning$5,574,752,502n/a29,474$9,380n/a$139,6600.000168%
Strong Wind$5,574,752,502$9,772,74029,474$200,637$24,708$263,0480.0036%$228,000$62,000Storm Events damage since the plan includes 2 zone-level Strong Wind records ($62,000): a NOAA non-thunderstorm wind type, outside NRI's Strong Wind definition.
Tornado$5,574,752,502$9,772,74029,474$757,083$1,274$2,045,9710.0136%
Wildfire$412,066,201$1,319,4404,778$14,708$5$3,5190.00357%
Winter Weather$5,574,752,502$9,772,74029,474$5,976$12$2,1780.000107%$0$321,074.30

Totals since 2024-02-13 (Storm Events through 2026-06-30): 29 county-coded records, 29 with a damage value recorded (including $0), $610,000; 7 zone-level records, 7 with a damage value recorded (including $0), $62,000 reported for the zone; Public Assistance: $321,074.30 on 2 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
Population29,474
Building value (total, not at risk)$5,574,752,502
Agriculture value (total, not at risk)$9,772,740
NRI risk rating (all hazards)Relatively Low
Expected annual loss, buildings and agriculture, all hazards$7,958,218
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)$4,582,517
Social vulnerability ratingVery High
Community resilience ratingRelatively Moderate
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)2Severe repetitive loss, FMA definition (44 CFR 77.2)2
Repetitive loss, NFIP insurance definition24Severe repetitive loss, NFIP insurance definition2

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 total222422402
of which: Natchez city1131301
of which: Adams County (unincorporated area)111411401
of which: Unknown (community ID Unknown in FEMA data)0070700
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
Adams County280209111411401
Natchez city2800011131301

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

Sources: 1, 4

Occupancy groupRL, FMApropertiesSRL, FMApropertiesRL, NFIPpropertiesSRL, NFIPpropertiesAny categorypropertiesMitigatedpropertiesCurrently insuredproperties
single-family residential221221201
2 to 4 unit residential0030301
other residential0000000
non-residential0090900
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 22 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). Adams County, MS: risk-assessment baseline packet, release 2026-10 (data as of 2026-09-30; County FIPS 28001). Automated baseline. https://hazardplain.org/ms/28001/ 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: [email protected]

Hazard Plain release 2026-10. As of 2026-09-30; Storm Events data through 2026-06-30. Automated baseline.