Alert archive / Dense Fog Advisories

Dense Fog Advisories in the United States, 2026

1,145 dense fog advisories in 2026. Each alert counts once, however many counties it covered. The last few weeks are still filling in as offices finish their follow-ups. 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
1,145
Busiest month
January259 dense fog advisories
Busiest day
March 5, 202643 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.

7 more states

The busiest days

Days with the most alerts issued, by UTC date.

  1. March 5, 202643dense fog advisories
  2. March 4, 202639dense fog advisories
  3. January 6, 202633dense fog advisories
  4. January 7, 202630dense fog advisories
  5. March 6, 202627dense fog advisories
  6. February 16, 202624dense fog advisories
  7. March 3, 202621dense fog advisories
  8. January 8, 202620dense fog advisories
  9. March 9, 202620dense fog advisories
  10. February 15, 202618dense fog advisories
  11. March 1, 202618dense fog advisories
  12. January 4, 202616dense fog advisories
  13. April 15, 202616dense fog advisories
  14. September 17, 202616dense fog advisories
  15. January 22, 202615dense fog advisories

Nearby

Alerts in force nowThe tornado archiveThe radar archive2025

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.