Alcorn County, MS
FEMA National Risk Index scores, disaster declarations & hazard data
Alcorn County has experienced 18 federally declared disasters since 1973, most recently Severe Winter Storm in 2026. Its overall natural hazard risk is rated Relatively Low — lower risk than most US counties.
Alcorn County's highest-rated hazards are earthquake, tornado, and cold wave, with its top risk rated "Relatively Low" by FEMA's National Risk Index. Recorded storm events have increased 381% over the past five years compared to the prior five-year period. Community vulnerability is elevated (89th percentile nationally), suggesting residents may face greater difficulty recovering from major disasters.
Past disasters & FEMA designations
A federal disaster declaration officially designates a county for FEMA disaster assistance. Alcorn County has been designated in 18 declarations since 1973, covering 5 disaster types including severe storm (9), hurricane (4), winter storm (2).
| Year | Type | Event name |
|---|---|---|
| 2026 | Winter Storm | Severe Winter Storm |
| 2026 | Winter Storm | Severe Winter Storm |
| 2022 | Hurricane | Hurricane Ida |
| 2021 | Hurricane | Hurricane Ida |
| 2020 | Severe Storm | Severe Storm, Straight-Line Winds, And Flooding |
| 2020 | Biological | Covid-19 Pandemic |
| 2020 | Biological | Covid-19 |
| 2019 | Severe Storm | Severe Storms, Straight-Line Winds, Tornadoes, And Flooding |
| 2011 | Severe Storm | Severe Storms, Tornadoes, Straight-Line Winds, And Associated Flooding |
| 2010 | Severe Storm | Severe Storms, Tornadoes, And Flooding |
Showing the 10 most recent of 18 total declarations since 1973.
Source: FEMA OpenFEMA Disaster Declarations Summaries. A single disaster can produce more than one record per county. Data current through September 2026.
Risk by hazard type
| Hazard | Risk rating | Risk score | Recorded events | Deaths | Prop. damage |
|---|---|---|---|---|---|
| Wildfire | Very Low | 44.3 | 0 | 0 | — |
| Inland Flooding | Relatively Low | 51.6 | 7 | 0 | $21K |
| Coastal Flooding | Not Applicable | — | 0 | 0 | — |
| Earthquake | Relatively Low | 89.8 | — | — | — |
| Heat Wave | Relatively Low | 74.9 | 69 | 0 | — |
| Tornado | Relatively Moderate | 87.5 | 6 | 0 | $1.3M |
| Hurricane | Very Low | 57.6 | 0 | 0 | — |
| Hail | Very Low | 31.3 | 12 | 0 | $1K |
| Strong Wind | Relatively Low | 43.3 | 0 | 0 | — |
| Winter Weather | Very Low | 16.7 | 0 | 0 | — |
| Ice Storm | Relatively Low | 37.4 | — | — | — |
| Cold Wave | Relatively Moderate | 81.2 | — | — | — |
| Lightning | Relatively Moderate | 62 | 1 | 0 | $10K |
| Drought | Relatively Low | 45.2 | 0 | 0 | — |
| Landslide | Relatively Low | 64.8 | 0 | 0 | — |
| Avalanche | Not Applicable | — | — | — | — |
| Tsunami | Not Applicable | — | — | — | — |
| Volcanic Activity | Not Applicable | — | — | — | — |
Scores are 0–100 percentiles relative to all US counties — higher means more exposed, not that a disaster is likely this year. Event counts: NOAA Storm Events 2016–2026; earthquake counts from USGS ComCat (M3.0+, 1996–2026). See the methodology page for details.
Community vulnerability
Alcorn County ranks in the 89th percentile (High) for community vulnerability — a measure of how hard disaster impacts tend to hit residents. Higher vulnerability means more displacement, worse health outcomes, and slower recovery after a disaster.
| SVI theme | Percentile | Vulnerability level |
|---|---|---|
| Overall | 89th | High |
| Socioeconomic status | 95th | High |
| Household characteristics | 68th | Moderate |
| Racial & ethnic minority status | 52nd | Moderate |
| Housing type & transportation | 88th | High |
Source: CDC/ATSDR Social Vulnerability Index 2022. Percentiles compare counties nationally — higher means more vulnerable relative to other counties. See CDC SVI for full methodology.
Future risk outlook
| Wildfire metric | National percentile | Level |
|---|---|---|
| Burn probability | 65th | Relatively High |
| Risk to homes | 61st | Relatively High |
| Buildings in direct exposure zone | 85.0% | — |
NOAA tracked 93 weather events in this county over 2016–2025: 16 in 2016–20 vs 77 in 2021–25 (+381% — frequency increasing).
Wildfire: USDA Forest Service Wildfire Risk to Communities (RDS-2020-0016-2) — modeled values, not annual forecasts. See wildfirerisk.org. Inland flood and heat projections pending data availability; coastal sea-level projections are available for select coastal counties below — see the data page.
Nearby counties
Frequently asked questions
What natural hazards pose the greatest risk in Alcorn County?
According to the FEMA National Risk Index, the highest-risk hazards in Alcorn County, Mississippi are earthquake, tornado, and cold wave. The county's overall natural hazard risk is rated Relatively Low — lower risk than most US counties.
Has Alcorn County received federal disaster declarations?
Yes. Alcorn County has received 18 federal disaster declarations since 1973, including declarations in 2026. The most common disaster type on record is severe storm (9 declarations).
Has Alcorn County had any FEMA disaster declarations in 2024, 2025, or 2026?
Yes. Recent federal disaster declarations for Alcorn County include Severe Winter Storm (2026), Severe Winter Storm (2026). See the declarations table above for the full history since 1973.
How does Alcorn County's natural hazard risk compare to nearby counties?
Among neighboring counties, Hardin County, TN has the highest overall natural hazard risk (Relatively Low) and Tishomingo County, MS has the lowest (Very Low). Alcorn County is rated Relatively Low overall.
How is Alcorn County's composite disaster risk index calculated?
Alcorn County's composite disaster risk index — officially FEMA's National Risk Index (NRI) — scores every US county on a 0–100 percentile scale across 18 natural hazard types, factoring in expected annual loss, social vulnerability, and community resilience. Alcorn County's composite score of 65 means its overall natural hazard risk is higher than 65% of US counties.