Ohio dense fog advisories
There are no dense fog advisories in Ohio right now. The last one was issued on October 24, 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 Ohio
None right now. Other active alerts in Ohio: none.
Dense Fog Advisories in Ohio by year
Ohio averaged 33.3 dense fog advisories per year from 2016 to 2025, and has had 43 so far in 2026. The most recent was issued on October 24, 2026.
Counties with the most dense fog advisories
| County | 2016–2025 |
|---|---|
| Williams County | 75 |
| Fulton County | 74 |
| Defiance County | 72 |
| Paulding County | 70 |
| Henry County | 69 |
| Logan County | 64 |
| Putnam County | 64 |
| Greene County | 63 |
| Darke County | 63 |
| Madison County | 63 |
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.