Enter any address in Johnston County, Oklahoma to see its FEMA flood zone
Flash flooding from severe thunderstorms is the dominant flood character in Johnston County, OK. Between 1993 and 2023, NOAA Storm Events data recorded 49 flash flood events, resulting in one fatality. In contrast, there were 7 general flood events with two fatalities during the same period. Recent events include flash flooding on May 25, 2025, and general flooding on May 2, 2025, both associated with severe thunderstorms.
National Flood Insurance Program (NFIP) claims data indicates that properties in Zone X have experienced flood damage, with an average payout of $93,985 and an average water depth of 1.0 foot. One claim was recorded in an unknown zone with no reported payout or water depth. Homeowners in Zone X, and those in areas not mapped or without a Base Flood Elevation (BFE), should pay the most attention to flood risk.
Summary generated from NOAA storm narratives and NFIP claim data for this county. Not predictive.
16 NOAA storm reports from this county describe what happened, in the words of the meteorologists who were there.
Johnston County, Oklahoma has recorded 56 flood-related events since 1996 according to NOAA's Storm Events Database, including 49 flash floods and 7 river or area floods. The county has received 21 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 (1981–2024)
Source: OpenFEMA Disaster Declarations Summaries.
| Declaration | Type | Date |
|---|---|---|
| Severe Storms, Straight-line Winds, Tornadoes, And Flooding | Tornado | Apr 25, 2024 |
| Severe Winter Storm | Severe Ice Storm | Feb 8, 2021 |
| Severe Winter Storms | Severe Ice Storm | Feb 8, 2021 |
| Covid-19 | Biological | Jan 20, 2020 |
| Covid-19 Pandemic | Biological | Jan 20, 2020 |
| Severe Storms, Tornadoes, Straight-line Winds, And Flooding | Tornado | May 16, 2017 |
| Severe Storms, Tornadoes, Straight-line Winds, And Flooding | Severe Storm | May 5, 2015 |
| Severe Winter Storm | Severe Storm | Jan 31, 2011 |
| Severe Winter Storm | Severe Storm | Jan 28, 2010 |
| Severe Storms, Tornadoes, And Flooding | Flood | Apr 9, 2008 |
NOAA Storm Events Database (1996–2025)
Source: NOAA National Weather Service Storm Events Database.
| Type | Date | Damage |
|---|---|---|
| Flood | May 25, 2025 | 0.00K |
| Flash Flood | May 25, 2025 | 25.00K |
| Flash Flood | May 25, 2025 | 50.00K |
| Flash Flood | May 25, 2025 | 75.00K |
| Flash Flood | May 25, 2025 | 0.00K |
| Flash Flood | Jun 8, 2025 | 0.00K |
| Flash Flood | Jun 8, 2025 | 10.00K |
| Flood | May 2, 2025 | 0.00K |
| Flash Flood | Apr 28, 2024 | 0.00K |
| Flash Flood | Mar 14, 2024 | 0.00K |
Flood — May 25, 2025
This episode once again featured widespread severe convection across the central and southern extents of the WFO Norman Forecast Area from the afternoon of the 25th into early morning of the 26th. The background synoptic regime featured generally weak flow, with evidence of multiple weak embedded upper systems from northern Mexico into portions of the south-central United States. A persistent p...
Flash Flood — May 25, 2025
This episode once again featured widespread severe convection across the central and southern extents of the WFO Norman Forecast Area from the afternoon of the 25th into early morning of the 26th. The background synoptic regime featured generally weak flow, with evidence of multiple weak embedded upper systems from northern Mexico into portions of the south-central United States. A persistent p...
Flash Flood — Jun 8, 2025
Another episode of intense severe weather impacted much of the WFO Norman Forecast Area during the afternoon through mid-evening on the 8th. Thunderstorm activity during this episode was focused generally along and just ahead of a southeastward advancing cold front, as a strong upper trough dove across the Plains. Very strong instability and sufficient deep-layer wind shear promoted organized t...
Flood — May 2, 2025
Numerous severe thunderstorms impacted portions of central and southern Oklahoma and western-north Texas early on the morning of the 2nd. Synoptically, this convective episode was driven by the approach of a weak shortwave trough rounding the periphery of a broader upper system across the Central and Northern Plains. Very strong elevated instability and sufficient wind shear promoted organized ...
Flash Flood — Apr 28, 2024
A widespread, long-duration and historic severe weather and tornado outbreak occurred from the late morning through late evening on the 27th. In all, 32 tornadoes affected portions of the WFO Norman Forecast Area, the third most in a single day during the period of reliable record. This included six significant (EF-2+) tornadoes and one violent (EF-4) tornado that struck Marietta (Love County)....
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 Johnston County, Oklahoma:
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 Johnston County, Oklahoma 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.