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EF0 tornado in Mason County, Illinois

Tornado June 18, 2025 · Mason County, Illinois

EF0
Rating
0.1 mi
Path length
100 yd
Path width
EF0EF1EF2EF3EF4EF5Unrated

The path drawn at its surveyed width of 100 yards (0.06 mi) — zoom in and the swath grows to true scale. Other tornadoes recorded nearby that day are shown faint.

What EF0 means. On the Enhanced Fujita scale, EF0 is light damage: shingles and siding peeled, gutters torn, branches broken, consistent with estimated gusts of 65–85 mph. The rating comes from a survey of the worst damage after the storm, not from a wind measurement, so it says as much about what the tornado hit as about how strong it was.

What the National Weather Service wrote

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.

The wider storm

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.

Began near Mason City (40.2319, -89.6750).

Other tornadoes from the same storm system

12 more tornadoes the National Weather Service filed under this storm episode.

EF2 Morgan CountyEF1 Scott CountyEF1 Morgan CountyEF1 Morgan CountyEF1 Sangamon CountyEF1 Cass CountyEF1 De Witt CountyEF0 Morgan CountyEFU Scott CountyEFU Cass CountyEFU Tazewell CountyEFU McLean County

Source: NOAA Storm Events Database, event 1261231. Narratives are written by the National Weather Service forecast office that issued the report.

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