Arizona dense fog advisories
There are no dense fog advisories in Arizona right now. The last one was issued on October 31, 2026.
Fog will reduce visibility to a quarter mile or less, making driving hazardous.
Updated 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 in Arizona
None right now. Other active alerts in Arizona: 1 (see the Arizona alerts page).
Dense Fog Advisories in Arizona by year
Arizona averaged 8.8 dense fog advisories per year from 2016 to 2025, and has had 7 so far in 2026. The most recent was issued on October 31, 2026.
Counties with the most dense fog advisories
| County | 2016–2025 |
|---|---|
| Pinal County | 40 |
| Yuma County | 20 |
| Cochise County | 15 |
| Gila County | 6 |
| La Paz County | 5 |
| Yavapai County | 3 |
| Pima County | 1 |
| Maricopa County | 1 |
What a dense fog advisory means
Dense fog can cause chain-reaction crashes on highways because drivers suddenly lose sight of the road ahead.
More about dense fog advisories and the national map →
What to do
- Slow down, use low-beam headlights and leave plenty of distance.
- Never use high beams in fog.