EF0 Tornado — Mason, Illinois

2025-06-18 · near Mason City, Mason, Illinois

0.1 mi

Path length

100 yds

Path width

Event narrative

A brief EF-0 tornado occurred approximately two miles northeast of Mason City. The tornado knocked over one tree, and also blew down a few tree limbs and corn along County Road 1200 N before dissipating.

Wider weather episode

A mesoscale convective vortex, or MCV, moved into central Illinois late on the morning of Wednesday, June 18th. Moderate instability developed ahead of this feature, and as scattered storms formed they quickly obtained rotation due to shear from the MCV. A total of 14 tornadoes occurred within the NWS Central Illinois county warning area, mainly west of I-55. One minor injury occurred when winds associated with a tornado tossed a woman against her home in Morgan County. Across eastern Illinois, a line of storms developed during the afternoon, mainly producing wind damage before shifting east into Indiana. A wake low developed after the MCV passed, resulting in a short period of non-thunderstorm wind gusts, generally between 45 and 55 mph. The highest non-thunderstorm wind gust associated with the wake low was 58 mph.

View location on OpenStreetMap → (40.2319, -89.6750)

Source: NOAA Storm Events Database, event_id 1261231. Narrative written by the NWS forecast office that issued the report.