Dense Fog in Massac, Illinois

Dense Fog February 15, 2026 – February 16, 2026 · Massac, Illinois

The wider storm

Clearing skies and light winds under high pressure, along with lingering low-level moisture, allowed for widespread dense fog formation to develop late evening across most of Southern Illinois. Dense fog continued until the early to mid-morning hours. Many locations reported low temperatures slightly below freezing but no reports were made of freezing fog development.

Source: NOAA Storm Events Database, event 1316925. Narratives are written by the National Weather Service forecast office that issued the report.

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