Dense Fog — Williamson, Illinois

2025-11-22 to 2025-11-23 · Williamson, Illinois

Wider weather episode

Surface high pressure nosed eastward across southern Illinois. The resultant clear and calm conditions allowed dense fog to develop, generally to the south of Interstate 64.

Source: NOAA Storm Events Database, event_id 1301771. Narrative written by the NWS forecast office that issued the report.