Alert archive / Dense Fog Advisories

Dense Fog Advisories in the United States, 2020

1,576 dense fog advisories in 2020. 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
1,576
Busiest month
January308 dense fog advisories
Busiest day
January 15, 202042 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.

9 more states

The busiest days

Days with the most alerts issued, by UTC date.

  1. January 15, 202042dense fog advisories
  2. January 14, 202030dense fog advisories
  3. October 21, 202029dense fog advisories
  4. January 13, 202026dense fog advisories
  5. March 11, 202024dense fog advisories
  6. December 12, 202023dense fog advisories
  7. February 17, 202022dense fog advisories
  8. October 22, 202021dense fog advisories
  9. January 27, 202021dense fog advisories
  10. January 26, 202020dense fog advisories
  11. March 18, 202020dense fog advisories
  12. March 25, 202020dense fog advisories
  13. December 21, 202019dense fog advisories
  14. December 13, 202017dense fog advisories
  15. January 3, 202017dense fog advisories

Nearby

Alerts in force nowThe tornado archiveThe radar archive20192021

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.