Alert archive / Flash Flood Watches
Flash Flood Watches in the United States, 2021
699 flash flood watches in 2021. Each alert counts once, however many counties it covered. The archive of flash flood watches reaches back to 2005.
Flash Flood Watches by state
Each state shaded by its count. Tap a state for its own archive.
- Flash Flood Watches
- 699
- Busiest month
- July174 flash flood watches
- Busiest day
- August 30, 202128 flash flood watches
Over time
By month
By state
Every state and territory, with the alerts that covered any part of it. Each state’s page lists every one of them.
- Colorado66
- Texas60
- Mississippi50
- Virginia46
- Alabama44
- New Mexico44
- Georgia42
- North Carolina42
- California41
- Pennsylvania40
- New York36
- Louisiana35
- Missouri33
- Arizona33
- Tennessee33
- Kentucky32
- Arkansas26
- Kansas24
- Florida24
- Maryland24
- South Carolina23
- Illinois23
- West Virginia22
- Utah22
- Connecticut21
- Indiana20
- Ohio19
- New Jersey19
- Nevada15
- Iowa15
- District of Columbia15
- Oklahoma14
- Massachusetts14
- Hawaii10
- Idaho10
- Delaware10
- Maine9
- Vermont9
- Montana7
- Guam7
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowThe tornado archiveThe radar archive20202022
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.