Alert archive / Severe Thunderstorm Watches

Severe Thunderstorm Watches in the United States, 2009

530 severe thunderstorm watches in 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.

AKMEVTNHWAIDMTNDMNILWIMINYRIMAORNVWYSDIAINOHPANJCTCAUTCONEMOKYWVVAMDDEAZNMKSARTNNCSCDCOKLAMSALGAHITXFLPR
Severe Thunderstorm Watches
530
Busiest month
June168 severe thunderstorm watches
Busiest day
June 18, 200917 severe thunderstorm 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.

9 more states

The busiest days

Days with the most alerts issued, by UTC date.

  1. June 18, 200917severe thunderstorm watches
  2. June 14, 200911severe thunderstorm watches
  3. June 19, 200911severe thunderstorm watches
  4. August 9, 200911severe thunderstorm watches
  5. May 8, 200910severe thunderstorm watches
  6. June 23, 200910severe thunderstorm watches
  7. August 4, 200910severe thunderstorm watches
  8. June 11, 20099severe thunderstorm watches
  9. June 12, 20099severe thunderstorm watches
  10. June 16, 20099severe thunderstorm watches
  11. August 10, 20099severe thunderstorm watches
  12. June 10, 20098severe thunderstorm watches
  13. May 3, 20097severe thunderstorm watches
  14. May 9, 20097severe thunderstorm watches
  15. June 15, 20097severe thunderstorm watches

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.