Dense Fog in Johnson, Illinois

Dense Fog November 21, 2025 · Johnson, Illinois

The wider storm

A very slow moving warm front stretched from west to east across southern portions of the Quad State the evening of the 20th into the early morning hours of the 21st. Pockets of intermittent dense fog developed, at times accompanied by light rain, and generally with calm or 3mph winds. In Southern Illinois, fog development was most prominent near the IL-13 corridor.

Source: NOAA Storm Events Database, event 1298788. Narratives are written by the National Weather Service forecast office that issued the report.

Tornadoes near your address

See every tornado that passed near a place you know, measured to its path.