Flash Flood Watches in the United States
9,957 flash flood watches since 1986. 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
- 9,957
- Busiest year
- 2015820 flash flood watches
- Average year
- 474over 21 years on file
- Busiest day
- August 30, 202128 flash flood watches
Over time
By year
Before late 2005 the archive holds only tornado, severe thunderstorm, flash flood and marine warnings, and from 1997 SPC's watches, so the jump that year is the archive widening, not the weather.
By month of the year
By state
Every state and territory, with the alerts that covered any part of it. Each state’s page lists every one of them.
- Texas1,116
- Missouri731
- California710
- Arkansas600
- Kansas574
- Illinois571
- Iowa566
- Virginia542
- Mississippi518
- Kentucky503
- West Virginia497
- Colorado482
- Louisiana478
- Pennsylvania474
- North Carolina438
- Indiana390
- Ohio381
- Alabama380
- Arizona378
- Oklahoma362
- New York354
- New Mexico353
- Maryland353
- Nebraska348
- Georgia322
- Tennessee294
- Minnesota271
- Wisconsin240
- Utah239
- South Carolina219
- New Jersey214
- Florida213
- Idaho192
- Nevada191
- Connecticut188
- Hawaii173
- South Dakota151
- Wyoming149
- Montana148
- Massachusetts140
The busiest days
Days with the most alerts issued, by UTC date.
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. Warning verification from the Mesonet's Cow. Rebuilt daily.