Alert archive / Severe Thunderstorm Watches / 2009
Severe Thunderstorm Watches in the United States, May 2009
69 severe thunderstorm watches in May 2009. Each alert counts once, however many counties it covered. The archive of severe thunderstorm watches reaches back to 1997.
Severe Thunderstorm Watches by state
Each state shaded by its count. Tap a state for its own archive.
- Severe Thunderstorm Watches
- 69
- Busiest day
- May 8, 200910 severe thunderstorm watches
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.
- Texas111
- Oklahoma89
- Kansas77
- Missouri75
- Nebraska74
- Arkansas70
- Iowa51
- Illinois45
- Kentucky44
- Tennessee43
- South Dakota42
- Louisiana37
- North Carolina36
- Georgia36
- Colorado36
- Mississippi36
- Virginia34
- Indiana34
- South Carolina30
- Pennsylvania29
- Minnesota29
- New York28
- Ohio25
- Wyoming24
- Alabama24
- Maryland23
- West Virginia20
- Montana19
- New Mexico18
- Wisconsin17
- North Dakota16
- New Jersey15
- Florida13
- Connecticut12
- Delaware12
- District of Columbia12
- Massachusetts11
- Michigan11
- Vermont11
- Idaho5
Nearby
Alerts in force nowThe tornado archiveThe radar archive20082010
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.