Alert archive / Dense Fog Advisories

Dense Fog Advisories in the United States, 2018

1,503 dense fog advisories in 2018. 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
1,503
Busiest month
December259 dense fog advisories
Busiest day
November 30, 201837 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. November 30, 201837dense fog advisories
  2. January 10, 201833dense fog advisories
  3. November 25, 201832dense fog advisories
  4. January 21, 201821dense fog advisories
  5. February 20, 201821dense fog advisories
  6. February 24, 201821dense fog advisories
  7. December 14, 201820dense fog advisories
  8. February 23, 201820dense fog advisories
  9. December 18, 201819dense fog advisories
  10. February 18, 201819dense fog advisories
  11. December 19, 201818dense fog advisories
  12. February 15, 201818dense fog advisories
  13. January 9, 201817dense fog advisories
  14. February 14, 201817dense fog advisories
  15. September 28, 201817dense fog advisories

Nearby

Alerts in force nowThe tornado archiveThe radar archive20172019

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.