Alert archive / Tornado Warnings

Tornado Warnings in the United States, 2011

4,643 tornado warnings in 2011. Each alert counts once, however many counties it covered. The archive of tornado warnings reaches back to 1986.

Tornado Warnings by state

Each state shaded by its count. Tap a state for its own archive.

AKMEVTNHWAIDMTNDMNILWIMINYRIMAORNVWYSDIAINOHPANJCTCAUTCONEMOKYWVVAMDDEAZNMKSARTNNCSCDCOKLAMSALGAHITXFLPR
Tornado Warnings
4,643
Busiest month
April1,884 tornado warnings
Busiest day
April 27, 2011450 tornado warnings

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.

7 more states

The busiest days

Days with the most alerts issued, by UTC date.

  1. April 27, 2011450tornado warnings
  2. May 25, 2011262tornado warnings
  3. April 28, 2011245tornado warnings
  4. April 15, 2011212tornado warnings
  5. April 16, 2011148tornado warnings
  6. April 26, 2011146tornado warnings
  7. May 26, 2011124tornado warnings
  8. April 20, 2011120tornado warnings
  9. September 5, 2011109tornado warnings
  10. April 25, 2011101tornado warnings
  11. May 22, 201197tornado warnings
  12. February 28, 201186tornado warnings
  13. April 23, 201175tornado warnings
  14. May 24, 201175tornado warnings
  15. November 16, 201174tornado warnings

Nearby

Alerts in force nowThe tornado archiveThe radar archive20102012

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.