Enter any address in Atascosa County, Texas to see its FEMA flood zone
Flash flooding from thunderstorms is the primary flood hazard in Atascosa County. Between 1993 and 2023, the NOAA Storm Events Database recorded 76 flash flood events. For example, heavy rain from thunderstorms caused flash flooding on June 12, 2025, and again on May 20, 2023.
National Flood Insurance Program (NFIP) claims data indicates that properties in Zone A have experienced frequent flooding, with an average of 3.3 feet of water depth across 10 claims. While Zone X_UNSHADED properties had fewer claims, the average payout was higher, suggesting significant damage can occur even in areas with lower flood risk designation. Homeowners in Zone A, Zone X_UNSHADED, and Zone X should pay close attention to flood risk.
Summary generated from NOAA storm narratives and NFIP claim data for this county. Not predictive.
11 NOAA storm reports from this county describe what happened, in the words of the meteorologists who were there.
Atascosa County, Texas has recorded 77 flood-related events since 1996 according to NOAA's Storm Events Database, including 76 flash floods. The county has received 20 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 (1967–2025)
Source: OpenFEMA Disaster Declarations Summaries.
| Declaration | Type | Date |
|---|---|---|
| Duke Fire | Fire | Mar 4, 2025 |
| Severe Winter Storm | Severe Ice Storm | Feb 11, 2021 |
| Severe Winter Storms | Severe Ice Storm | Feb 11, 2021 |
| Covid-19 | Biological | Jan 20, 2020 |
| Covid-19 Pandemic | Biological | Jan 20, 2020 |
| Severe Storms, Tornadoes, Straight-line Winds And Flooding | Severe Storm | May 4, 2015 |
| Tropical Storm Alex | Hurricane | Jun 27, 2010 |
| Wildfires | Fire | Mar 14, 2008 |
| Severe Storms, Tornadoes, And Flooding | Severe Storm | Jun 16, 2007 |
| Severe Storms And Tornadoes | Severe Storm | Apr 21, 2007 |
NOAA Storm Events Database (1996–2025)
Source: NOAA National Weather Service Storm Events Database.
| Type | Date | Damage |
|---|---|---|
| Flash Flood | Jun 12, 2025 | 0.00K |
| Flash Flood | May 20, 2023 | 0.00K |
| Flash Flood | Apr 6, 2023 | 0.00K |
| Flash Flood | Aug 21, 2016 | 0.00K |
| Flash Flood | Aug 20, 2016 | 0.00K |
| Flash Flood | Apr 24, 2015 | 0.00K |
| Flash Flood | Jun 25, 2014 | 0.00K |
| Flash Flood | Mar 28, 2012 | 0.00K |
| Flash Flood | May 10, 2012 | 0.00K |
| Flash Flood | Apr 17, 2010 | 0.00K |
Flash Flood — Jun 12, 2025
A mid-level shortwave trough moved over Texas and combined with an abnormally moist airmass to generate thunderstorms. These storms were very efficient rain producers dropping locally heavy rain that led to flash flooding. There were also a few severe thunderstorms.
Flash Flood — May 20, 2023
Thunderstorms developed along a trough ahead of a cold front. One of these storms produced large hail. More storms formed along the cold front some of which produced locally heavy rain that led to flash flooding.
Flash Flood — Apr 6, 2023
Warm air advection above a cooler airmass generated elevated thunderstorms. Training of storms led to locally heavy rainfall and minor flooding.
Flash Flood — Aug 21, 2016
Convection formed over the northern Mexican mountains during the afternoon and evening of August 20 beneath an upper level trough over the southern plains. This convection eventually formed into a mesoscale convective system as a low level jet developed overnight. The MCS produced heavy rain as it moved into a tropical airmass over South Central Texas. The MCS dissipated, and then convection re...
Flash Flood — Aug 20, 2016
Convection formed over the northern Mexican mountains during the afternoon and evening of August 20 beneath an upper level trough over the southern plains. This convection eventually formed into a mesoscale convective system as a low level jet developed overnight. The MCS produced heavy rain as it moved into a tropical airmass over South Central Texas. The MCS dissipated, and then convection re...
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 Atascosa 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 Atascosa 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.