Alert archive / Flash Flood Warnings / 2026
Flash Flood Warnings in the United States, May 2026
408 flash flood warnings in May 2026. Each alert counts once, however many counties it covered. The last few weeks are still filling in as offices finish their follow-ups. The archive of flash flood warnings reaches back to 1986.
Flash Flood Warnings by state
Each state shaded by its count. Tap a state for its own archive.
- Flash Flood Warnings
- 408
- Busiest day
- May 25, 202636 flash flood warnings
Over time
By day
Days in UTC, the clock the archive keeps.
By state
Every state and territory, with the alerts that covered any part of it. Each state’s page lists every one of them.
- Texas732
- Arizona500
- New Mexico336
- Pennsylvania300
- Ohio259
- Kentucky237
- West Virginia225
- Colorado224
- Illinois218
- Missouri216
- Indiana209
- Utah175
- Louisiana173
- Virginia164
- Tennessee159
- Oklahoma158
- New Jersey138
- New York131
- Mississippi131
- Georgia126
- Kansas119
- Arkansas114
- North Carolina94
- Alabama90
- Iowa89
- Nebraska72
- Hawaii52
- California43
- Maryland43
- Montana42
- South Carolina42
- Florida40
- Wisconsin38
- Minnesota29
- Michigan28
- Puerto Rico28
- Idaho26
- Connecticut22
- South Dakota21
- Delaware21
Nearby
Sources
National Weather Service watches, warnings, advisories and statements from the Iowa Environmental Mesonet's VTEC archive, which reconstructs tornado, severe thunderstorm, flash flood and marine warnings back to 1986 from the NWS text archive. Storm Prediction Center watches and mesoscale discussions from SPC's archive through the Mesonet. County centers from the US Census Bureau. Rebuilt daily.