Dense Fog in Jefferson, Illinois

Dense Fog February 10, 2026 · Jefferson, Illinois

The wider storm

Following clear skies and calm winds overnight, southerly winds picked up after sunrise in the warm sector and advection fog spread into portions of far Southwestern Illinois through mid-morning as dew points surged to over 50 degrees. Dense fog was also observed in portions of Mount Vernon.

Source: NOAA Storm Events Database, event 1316257. Narratives are written by the National Weather Service forecast office that issued the report.

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