Dense Fog Advisory map: active dense fog advisories now

5 dense fog advisories are in effect right now for parts of 3 states: Alaska, Montana, Washington.

Fog will reduce visibility to a quarter mile or less, making driving hazardous.

Updated 12:42 PM EST from the National Weather Service · lists refresh hourly; the live map loads current alerts directly from the NWS

Map data: NWS, OpenFreeMap, OpenStreetMap

Active dense fog advisories

Dense Fog Advisory

Kittitas ValleyUntil Sat, 11:00 AM PST · NWS Pendleton OR

DENSE FOG ADVISORY IN EFFECT UNTIL 11 AM PST THIS MORNING

Dense Fog Advisory

Anchorage; Lower Matanuska Valley; Southern Susitna Valley; Central Susitna ValleyUntil Sat, 9:00 AM AKST · NWS Anchorage AK

DENSE FOG ADVISORY REMAINS IN EFFECT UNTIL 9 AM AKST THIS MORNING

Dense Fog Advisory

Fallon; CarterUntil Sat, 11:00 AM MST · NWS Billings MT

DENSE FOG ADVISORY REMAINS IN EFFECT UNTIL 11 AM MST THIS MORNING

Dense Fog Advisory

Northern Blaine CountyUntil Sat, 11:00 AM MST · NWS Great Falls MT

DENSE FOG ADVISORY REMAINS IN EFFECT UNTIL 11 AM MST THIS MORNING

Dense Fog Advisory

Hill CountyUntil Sat, 11:00 AM MST · NWS Great Falls MT

DENSE FOG ADVISORY REMAINS IN EFFECT UNTIL 11 AM MST THIS MORNING

What is a dense fog advisory?

Dense fog can cause chain-reaction crashes on highways because drivers suddenly lose sight of the road ahead.

What to do

Slow down, use low-beam headlights and leave plenty of distance.
Never use high beams in fog.

How often dense fog advisories are issued

From 2016 through 2025 the National Weather Service issued an average of 1,621 dense fog advisories per year across the country, and 1,499 so far in 2026. Each count is one alert event, which can cover one or many counties.

Dense Fog Advisories issued per year, 2016–2025

Dense Fog Advisories by month of issue, 2016–2025 total

States with the most dense fog advisories

State	Average per year
Texas	201.5
Florida	121
California	117.7
Kansas	107.2
Georgia	89.6
Mississippi	87.9
Alabama	84.7
Missouri	82.9
Minnesota	82.2
Illinois	78.9
Louisiana	77.6
Nebraska	76.3
Iowa	73.8
Wisconsin	66.1
Alaska	60.5

Dense Fog Advisory map: active dense fog advisories now

Active dense fog advisories

Washington 1

Dense Fog Advisory

Alaska 1

Dense Fog Advisory

Montana 3

Dense Fog Advisory

Dense Fog Advisory

Dense Fog Advisory

What is a dense fog advisory?

What to do

How often dense fog advisories are issued

States with the most dense fog advisories

Dense Fog Advisories by state