Alert archive / Mesoscale Discussions

Mesoscale Discussions in the United States, 2009

2,303 mesoscale discussions in 2009. Each alert counts once, however many counties it covered. The archive of mesoscale discussions reaches back to 2003.

Mesoscale Discussions by state

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

AKMEVTNHWAIDMTNDMNILWIMINYRIMAORNVWYSDIAINOHPANJCTCAUTCONEMOKYWVVAMDDEAZNMKSARTNNCSCDCOKLAMSALGAHITXFLPR
Mesoscale Discussions
2,303
Busiest month
June482 mesoscale discussions
Busiest day
June 18, 200936 mesoscale discussions

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.

8 more states

The busiest days

Days with the most alerts issued, by UTC date.

  1. June 18, 200936mesoscale discussions
  2. June 11, 200930mesoscale discussions
  3. June 14, 200924mesoscale discussions
  4. June 12, 200923mesoscale discussions
  5. June 15, 200923mesoscale discussions
  6. June 19, 200923mesoscale discussions
  7. May 6, 200922mesoscale discussions
  8. March 27, 200921mesoscale discussions
  9. April 10, 200921mesoscale discussions
  10. April 27, 200921mesoscale discussions
  11. June 25, 200921mesoscale discussions
  12. April 26, 200920mesoscale discussions
  13. June 10, 200920mesoscale discussions
  14. April 2, 200919mesoscale discussions
  15. May 9, 200919mesoscale discussions

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.