Enter any address in Dimmit County, Texas to see its FEMA flood zone
Flash flooding from thunderstorms dominates the flood character of Dimmit County. Over the last 30 years, NOAA Storm Events data shows 43 flash flood events, compared to 10 general flood events and 1 tropical storm. Recent events include flash flooding on September 3, 2024, caused by slow-moving, heavy rain-producing thunderstorms. Earlier, on May 11, 2021, thunderstorms along a stationary front also produced heavy rainfall.
National Flood Insurance Program (NFIP) claims data indicates that properties in Zone X and Zone X_Unshaded have experienced significant payouts, with average claim amounts exceeding $150,000 and $99,000 respectively, and average water depths of 3.0 ft and 1.0 ft. Properties in Zone A have also filed claims, though with lower average payouts and water depths. Residents in areas designated as Zone A, or those without a Base Flood Elevation (BFE), should pay particular attention to flood risk.
Summary generated from NOAA storm narratives and NFIP claim data for this county. Not predictive.
3 NOAA storm reports from this county describe what happened, in the words of the meteorologists who were there.
Dimmit County, Texas has recorded 54 flood-related events since 1996 according to NOAA's Storm Events Database, including 43 flash floods and 10 river or area floods. The county has received 17 federal disaster declarations, 2 of which involved flooding or coastal storms. Enter any address above to check its FEMA flood zone designation.
FEMA Disaster Declarations (1983–2021)
Source: OpenFEMA Disaster Declarations Summaries.
| Declaration | Type | Date |
|---|---|---|
| Severe Winter Storm | Severe Ice Storm | Feb 11, 2021 |
| Severe Winter Storms | Severe Ice Storm | Feb 11, 2021 |
| Hurricane Hanna | Hurricane | Jul 25, 2020 |
| Covid-19 | Biological | Jan 20, 2020 |
| Covid-19 Pandemic | Biological | Jan 20, 2020 |
| Severe Storms And Flooding | Flood | Sep 10, 2018 |
| 322 Fire | Fire | Mar 15, 2008 |
| Wildfires | Fire | Mar 14, 2008 |
| Extreme Wildfire Threat | Fire | Nov 27, 2005 |
| Hurricane Rita | Hurricane | Sep 23, 2005 |
NOAA Storm Events Database (1996–2025)
Source: NOAA National Weather Service Storm Events Database.
| Type | Date | Damage |
|---|---|---|
| Flash Flood | Sep 3, 2024 | 0.00K |
| Flood | May 11, 2021 | 0.00K |
| Flood | Sep 27, 2017 | 0.00K |
| Flash Flood | Sep 26, 2017 | 0.00K |
| Flash Flood | May 21, 2015 | 0.00K |
| Flash Flood | May 15, 2015 | 0.00K |
| Flash Flood | Oct 9, 2015 | 0.00K |
| Flash Flood | Jun 14, 2013 | 0.00K |
| Flash Flood | Oct 13, 2013 | 0.00K |
| Flash Flood | Apr 15, 2010 | 0.00K |
Flash Flood — Sep 3, 2024
Convection formed in the vicinity of a stationary front over South-Central Texas. Thunderstorms developed in an anomalously moist airmass with weak steering flow. This led to slow moving, heavy rain producing cells and flash flooding.
Flood — May 11, 2021
Thunderstorms developed along a stationary front over South Central Texas for a third straight day. Some of these storms produced large hail.
Flood — Sep 27, 2017
The remnants of Pacific Tropical Storm Pilar moved across Mexico adding mid-level moisture to an already moist boundary layer. Precipitable water values were around 2.5 inches when a series of upper level shortwave troughs initiated thunderstorms. Some of these storms produced heavy rainfall that led to flash flooding.
Flash Flood — Sep 26, 2017
The remnants of Pacific Tropical Storm Pilar moved across Mexico adding mid-level moisture to an already moist boundary layer. Precipitable water values were around 2.5 inches when a series of upper level shortwave troughs initiated thunderstorms. Some of these storms produced heavy rainfall that led to flash flooding.
Flash Flood — May 21, 2015
Scattered thunderstorms producing heavy rainfall resulted in flash flooding in the Hill Country and Edwards Plateau as well as the southern Rio Grande Valley during the early morning hours.
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 Dimmit County, Texas:
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 Dimmit County, Texas 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.