Alert archive / Dense Fog Advisories

Dense Fog Advisories in the United States, 2009

1,233 dense fog advisories in 2009. Each alert counts once, however many counties it covered. The archive of dense fog advisories reaches back to 2005.

Dense Fog Advisories by state

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

AKMEVTNHWAIDMTNDMNILWIMINYRIMAORNVWYSDIAINOHPANJCTCAUTCONEMOKYWVVAMDDEAZNMKSARTNNCSCDCOKLAMSALGAHITXFLPR
Dense Fog Advisories
1,233
Busiest month
January205 dense fog advisories
Busiest day
December 14, 200932 dense fog advisories

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.

10 more states

The busiest days

Days with the most alerts issued, by UTC date.

  1. December 14, 200932dense fog advisories
  2. December 13, 200927dense fog advisories
  3. January 3, 200923dense fog advisories
  4. November 20, 200919dense fog advisories
  5. January 4, 200918dense fog advisories
  6. September 10, 200918dense fog advisories
  7. March 17, 200917dense fog advisories
  8. November 23, 200916dense fog advisories
  9. January 5, 200915dense fog advisories
  10. January 19, 200915dense fog advisories
  11. September 13, 200915dense fog advisories
  12. November 26, 200914dense fog advisories
  13. November 22, 200913dense fog advisories
  14. December 15, 200913dense fog advisories
  15. March 16, 200913dense fog advisories

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. Warning verification from the Mesonet's Cow. Rebuilt daily.