Dense fog advisory warns of sudden visibility drops
The National Weather Service flagged patchy dense fog for Clark County overnight, urging drivers to slow down and leave extra room.
Driving in it
Forecasters issued the first statement at 2:12 a.m., saying fog would develop as low clouds cleared NWS. It was set to expire at 5 a.m. NWS. The weather service told drivers to leave more space between vehicles, use low-beam headlights and allow extra time to reach their destination NWS. A follow-up statement at 4:43 a.m. repeated the same warning and extended the advisory until 9 a.m. NWS.
Similar fog statements had also gone out the evening before. The weather service issued one around 7:36 p.m. on October 11 as it watched conditions develop overnight NWS. It issued another at 11:47 p.m. that night with the same warning NWS.
This report is based on special weather statements issued by the National Weather Service office in Wilmington, Ohio, on October 11 and 12, 2026 NWS +3.
Sources
The source filing
| Event | Special Weather Statement |
|---|---|
| Message type | Alert |
| Severity | Moderate |
| Certainty | Observed |
| Urgency | Expected |
| Headline | Special Weather Statement issued October 12 at 2:12AM EDT by NWS Wilmington OH |
| Area desc | Mason; Hardin; Mercer; Auglaize; Darke; Shelby; Logan; Miami; Champaign; Clark; Montgomery; Greene; Warren; Clinton; Brown |
| Effective | October 12, 2026, 2:12 a.m. |
| Expires | October 12, 2026, 5:00 a.m. |
| Sender name | NWS Wilmington OH |
Published by National Weather Service (api.weather.gov). This is the agency's public filing as The Lantern received it, shown with its fields named in plain English.