Weather alerts in the United States, April 2009
8,177 weather alerts in April 2009, from the National Weather Service and the Storm Prediction Center. Each alert counts once, however many counties it covered.
Weather alerts by state
Each state shaded by its count. Tap a state for its own archive.
- Alerts
- 8,177
- Warnings
- 4,948
- Watches
- 588
- Advisories
- 1,797
- Busiest day
- April 10, 2009588 alerts
Over time
By day
Days in UTC, the clock the archive keeps.
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
By state
Every state and territory, with the alerts that covered any part of it. Each state’s page lists every one of them.
- Texas8,488
- Florida7,551
- Alaska5,674
- Georgia3,982
- Missouri3,531
- Kansas3,429
- Alabama3,208
- Oklahoma3,150
- Virginia2,997
- North Carolina2,996
- Arkansas2,929
- Illinois2,592
- Mississippi2,514
- California2,513
- Louisiana2,503
- New York2,372
- Nebraska2,255
- Tennessee2,232
- Kentucky2,056
- Pennsylvania1,951
- Michigan1,896
- Indiana1,867
- New Mexico1,829
- Colorado1,778
- South Carolina1,736
- Oregon1,713
- Montana1,626
- Iowa1,551
- Minnesota1,454
- Ohio1,383
- South Dakota1,339
- Washington1,249
- Wisconsin1,243
- Wyoming1,238
- Idaho1,042
- Maine988
- New Jersey933
- North Dakota927
- West Virginia915
- Massachusetts902
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.