Enter any address in Harrison County, Mississippi to see its FEMA flood zone
Flash flooding from thunderstorms is the most frequent flood event in Harrison County, MS, with 61 occurrences recorded in the last 30 years. Heavy rainfall has led to flooded apartment units and roads, as seen in incidents in July 2025.
National Flood Insurance Program (NFIP) data shows a significant number of claims across various flood zones. Zone A, with 8,791 claims, experienced an average water depth of 19.3 feet. Zone X_SHADED and Zone V also show high average water depths of 20.6 and 23.1 feet respectively, with Zone V having an average payout of $97,040.
Residents in coastal areas, particularly those in Zone V and Zone A, should be aware of potential flood risks. Properties in Zone X_SHADED and Zone X_UNSHADED also have a history of claims and significant water depths, indicating a need for attention regardless of proximity to the coast.
Summary generated from NOAA storm narratives and NFIP claim data for this county. Not predictive.
38 NOAA storm reports from this county describe what happened, in the words of the meteorologists who were there.
Harrison County, Mississippi has recorded 80 flood-related events since 1996 according to NOAA's Storm Events Database, including 61 flash floods and 14 river or area floods. The county has received 36 federal disaster declarations, 1 of which involved flooding or coastal storms. Enter any address above to check its FEMA flood zone designation.
FEMA Disaster Declarations (1965–2026)
Source: OpenFEMA Disaster Declarations Summaries.
| Declaration | Type | Date |
|---|---|---|
| Severe Winter Storm | Winter Storm | Jan 23, 2026 |
| Hurricane Ida | Hurricane | Aug 28, 2021 |
| Hurricane Zeta | Hurricane | Oct 28, 2020 |
| Hurricane Delta | Hurricane | Oct 7, 2020 |
| Hurricane Sally | Hurricane | Sep 14, 2020 |
| Hurricane Marco And Tropical Storm Laura | Hurricane | Aug 23, 2020 |
| Covid-19 | Biological | Jan 20, 2020 |
| Covid-19 Pandemic | Biological | Jan 20, 2020 |
| Hurricane Nate | Hurricane | Oct 6, 2017 |
| Hurricane Isaac | Hurricane | Aug 26, 2012 |
NOAA Storm Events Database (1996–2025)
Source: NOAA National Weather Service Storm Events Database.
| Type | Date | Damage |
|---|---|---|
| Flash Flood | Jun 9, 2025 | 0.00K |
| Flash Flood | Jul 1, 2025 | 10.00K |
| Flash Flood | Jul 1, 2025 | 0.00K |
| Flash Flood | Jul 1, 2025 | 225.00K |
| Storm Surge/Tide | Jun 16, 2024 | 0.00K |
| Flash Flood | Sep 11, 2024 | 30.00K |
| Tropical Storm | Sep 11, 2024 | 0.00K |
| Storm Surge/Tide | Sep 11, 2024 | 10.00K |
| Flash Flood | Jun 20, 2023 | 10.00K |
| Flood | Jun 20, 2023 | 0.00K |
Flash Flood — Jun 9, 2025
Northwest flow aloft regime continued to be in place on June 9th with an upper level ridge center west of the local forecast area. This pattern carried developing storms from NW to SE across the area late in the afternoon. Sufficient instability aided in thunderstorm enhancement which resulted in severe wind gusts.
Flash Flood — Jul 1, 2025
Strong to severe thunderstorms impacted the Mississippi Gulf Coast and adjacent waters on July 1, 2025, as a cold front moved into a hot and humid airmass. Over land, storms produced damaging wind gusts up to 76 mph at Gulfport-Biloxi International Airport, resulting in downed trees, large branches, and power lines across Harrison County. Heavy rainfall also caused flash flooding in Harrison an...
Storm Surge/Tide — Jun 16, 2024
As a surface ridge nearby shifted off to the northeast during the 3rd weekend of June, light and variable winds became onshore and more steady state. By June 16th, the surface ridge shifted offshore into the Atlantic Ocean and a surface low pressure was developing as it crossed the Yucatan Peninsula. It was at this point that east to southeast winds increased to 15-20 knots across local coastal...
Flash Flood — Sep 11, 2024
Hurricane Francine formed as a tropical storm in the Gulf of Mexico on September 9, 2024, and intensified into a Category 2 hurricane before making landfall near Houma, Louisiana, on the morning of September 11. Coastal counties of Mississippi experienced sustained tropical storm force winds and gusts which caused mostly minor damage to some homes and powerlines. A storm surge of 4-6 feet inun...
Tropical Storm — Sep 11, 2024
Hurricane Francine formed as a tropical storm in the Gulf of Mexico on September 9, 2024, and intensified into a Category 2 hurricane before making landfall near Houma, Louisiana, on the morning of September 11. Coastal counties of Mississippi experienced sustained tropical storm force winds and gusts which caused mostly minor damage to some homes and powerlines. A storm surge of 4-6 feet inun...
Source: NOAA National Weather Service Storm Events Database.
Source: OpenFEMA NFIP Individual Claims (2.25M records analyzed).
FEMA assigns flood zone designations to areas in Harrison County, Mississippi:
AE High Risk — 1% annual chance of flooding. Insurance required.
VE Very High Risk — Coastal flooding with wave action.
X (Shaded) Moderate Risk — 500-year floodplain.
X Low Risk — Outside major floodplains.
Properties in Harrison County, Mississippi that are in FEMA-designated Special Flood Hazard Areas (zones A and V) with federally backed mortgages are required to carry flood insurance.
Even outside high-risk zones, flood insurance is recommended. From 2014 to 2024, nearly one-third of NFIP claims came from outside the high-risk Special Flood Hazard Area.
Visit FloodSmart.gov to find an agent and get a quote.