Dense Fog in Massac, Illinois

Dense Fog January 8, 2026 · Massac, Illinois

The wider storm

Southerly winds advected warm moist air northward from Arkansas/Tennessee, resulting in dense fog across most of the southern two rows of counties in Southern Illinois early morning on the 8th. Daytime heating began to lower RHs below 100%, allowing for slow improvement in visibility mid-morning.

Source: NOAA Storm Events Database, event 1311270. Narratives are written by the National Weather Service forecast office that issued the report.

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