Heavy Snow — Knox, Illinois

2024-01-12 to 2024-01-13 · Knox, Illinois

Event narrative

Numerous weather observers reported in excess of 6 inches of snow across Knox County...with over 10 inches in the far northern part of the county, including 10.9 inches in Altona. The heavy snow led to dangerous road conditions and several traffic accidents.

Wider weather episode

A 996mb low over western Oklahoma during the evening of January 11th deepened to 981mb as it tracked northeastward into Michigan by the evening of January 12th. Light rain developed across much of central Illinois initially...with heavy wet snow occurring along and north of a Keokuk, Iowa...to Peoria...to Pontiac line. With elevated instability increasing, scattered convection developed as well....with thundersnow being observed at Altona in Knox County. As the low tracked between the I-55 and I-57 corridors during the day of January 12th, enough warm air was drawn northward to change the wet snow over to a period of rain. Storm total snowfall of 6 to 10 inches was observed across portions of Knox, Stark, and Marshall Counties.

Source: NOAA Storm Events Database, event_id 1154936. Narrative written by the NWS forecast office that issued the report.