Delaware dense fog advisories
There are no dense fog advisories in Delaware right now. The last one was issued on April 3, 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 Delaware
None right now. Other active alerts in Delaware: 1 (see the Delaware alerts page).
Dense Fog Advisories in Delaware by year
Delaware averaged 8.6 dense fog advisories per year from 2016 to 2025, and has had 10 so far in 2026. The most recent was issued on April 3, 2026.
Counties with the most dense fog advisories
| County | 2016–2025 |
|---|---|
| New Castle County | 66 |
| Kent County | 56 |
| Sussex County | 49 |
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.