EF0 Tornado — Mason, Illinois

2025-09-20 · near Luther, Mason, Illinois

Event narrative

A tornado touched down in a field 2 miles east-northeast of Mason City at 3:09 PM CDT. It tracked slowly southeastward through fields causing minor tree damage before crossing Highway 10 and dissipating 2 miles west of New Holland at 3:15 PM CDT.

Wider weather episode

An upper-level disturbance interacting with a nearly stationary frontal boundary triggered clusters of strong thunderstorms across central Illinois during the afternoon of September 20th. A storm cell intersecting an outflow boundary over Mason County resulted in an EF-0 tornado east of Mason City. Meanwhile other storms produced hail as large as quarters and isolated minor wind damage.

View location on OpenStreetMap → (40.2146, -89.6584)

Source: NOAA Storm Events Database, event_id 1289095. Narrative written by the NWS forecast office that issued the report.