Natural disaster risk in Harrison County, Mississippi
Mississippi · population 208,275 · FIPS 28047
Overall: relatively high risk
Harrison County has a composite risk score of 95.6 out of 100 — higher than 95% of US counties. It ranks 1 of 82 in Mississippi (1 = highest risk). Its highest-rated hazards are hurricane, lightning, tornado.
Drought now: No: no drought or dryness
No. On the U.S. Drought Monitor map valid 13 October 2026, no part of Harrison County is in drought or abnormally dry (none of D0 to D4). That has been so for 1 week so far.
Drought in Harrison County: the last 52 weeks · droughtmonitor.unl.edu
The U.S. Drought Monitor is jointly produced by the National Drought Mitigation Center at the University of Nebraska-Lincoln, the United States Department of Agriculture, the National Oceanic and Atmospheric Administration and the National Aeronautics and Space Administration. Map courtesy of NDMC.
Risk, loss, vulnerability and resilience
| Measure | Rating and score |
|---|---|
| Overall risk Expected annual loss, adjusted for social vulnerability and community resilience. |
Relatively high 95.6 |
| Expected annual loss About $154.6 million a year, on average, across all 18 hazards. |
Relatively moderate 94.3 |
| Social vulnerability Higher means people may find it harder to prepare and recover. |
Relatively high 68.9 |
| Community resilience Higher means a stronger ability to prepare, adapt and recover. |
Relatively high 66.2 |
Risk by hazard
FEMA's risk rating for each of 18 natural hazards in Harrison County, highest first. "Not applicable" means the hazard is not modelled here.
| Hazard | Risk rating and score |
|---|---|
| Hurricane | Very high 98 |
| Lightning | Very high 97 |
| Tornado | Relatively high 95 |
| Coastal flooding | Relatively high 91 |
| Strong wind | Relatively high 85 |
| Heat wave | Relatively moderate 94 |
| Wildfire | Relatively moderate 94 |
| Inland (riverine) flooding | Relatively moderate 90 |
| Cold wave | Relatively moderate 87 |
| Hail | Relatively moderate 87 |
| Ice storm | Relatively moderate 74 |
| Winter weather | Relatively moderate 74 |
| Earthquake | Relatively low 70 |
| Drought | Relatively low 58 |
| Landslide | Very low 33 |
| Avalanche | Not applicable |
| Tsunami | Insufficient data |
| Volcanic activity | Not applicable |
FEMA disaster declarations for Harrison County
Federal declarations that designated Harrison County, since 1 Jan 2024 (the period this site keeps from OpenFEMA). Older declarations are in FEMA's own dataset.
Yes. Harrison County has been named in 3 FEMA declarations since 1 Jan 2024. The latest is DR-4930-MS (Tropical Storm Arthur), declared 3 Aug 2026.
| Declaration | Kind | Incident | Declared | Individual assistance here |
|---|---|---|---|---|
| DR-4930-MS | Major disaster | Tropical Storm Arthur | 3 Aug 2026 | Yes |
| DR-4899-MS | Major disaster | Severe Winter Storm | 6 Feb 2026 | No |
| EM-3640-MS | Emergency | Severe Winter Storm | 24 Jan 2026 | No |
All FEMA declarations in Mississippi, with estimated apply-by dates · Open FEMA deadlines
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). Dataset: Disaster Declarations Summaries - v2.
How to read these ratings
- Ratings run in five steps: very low, relatively low, relatively moderate, relatively high and very high. They compare a county with every other US county; they are not a measure of danger on their own.
- Scores run from 0 to 100 and are national percentiles. The bar shows the score: a score of 80 means a higher value than 80% of US counties.
- Overall risk combines the expected annual loss with social vulnerability and community resilience.
- Expected annual loss is the average yearly loss to buildings, people and agriculture the model expects from all 18 hazards.
- Social vulnerability describes how hard it may be for people to prepare for and recover from a disaster. Higher is worse.
- Community resilience describes a community's ability to prepare, adapt and recover. Higher is better.
- "Not applicable" means FEMA does not model that hazard there (for example, hurricanes far inland).
About this data
Source: FEMA National Risk Index, version 1.20, released December 2025, published by the Federal Emergency Management Agency (US public domain). About the National Risk Index. The index is a model of relative risk built from historical hazard records, what is exposed and community factors. It is not a forecast, it does not describe any single property, and it is not insurance or financial advice. For decisions about a specific address, check FEMA's flood maps and your local emergency management office.
Questions
What is the natural disaster risk in Harrison County, Mississippi?
FEMA's National Risk Index rates the overall risk in Harrison County as relatively high, with a score of 95.6 out of 100 (higher than 95% of US counties). That is a comparison with other US counties, not a forecast.
What are the biggest natural hazards in Harrison County?
The hazards rated highest for Harrison County are hurricane (very high), lightning (very high), tornado (relatively high).
What is the flood risk in Harrison County?
FEMA rates inland (river and rain) flooding risk in Harrison County as relatively moderate, and coastal flooding risk as relatively high. For a specific property, check the FEMA flood map and your local floodplain office.
Has Harrison County had a FEMA disaster declaration?
Yes. Harrison County has been named in 3 FEMA declarations since 1 Jan 2024. The latest is DR-4930-MS (Tropical Storm Arthur), declared 3 Aug 2026.
Is Harrison County in a drought?
No. On the U.S. Drought Monitor map valid 13 October 2026, no part of Harrison County is in drought or abnormally dry (none of D0 to D4). That has been so for 1 week so far.
Every county in Mississippi, ranked · All states · Disasters near me