Hail — Williamson, Illinois

2025-05-01 · near (mwa)marion Wllmson, Williamson, Illinois

Event narrative

Hail to the size of quarters fell in a swath from near the intersection of Highway 148 and Highway 13 east southeast through the south side of Marion.

Wider weather episode

An upper-level disturbance moved northeast through the Mid-Mississippi Valley through the afternoon, as the associated surface low lifted northeast across Michigan. The best instability was slightly elevated (MLCAPE values near 1000J/kg vs MUCAPE values 1500-2000J/kg), and the effective shear was barely 25kts. A subtle surface trough helped to get isolated storms going around 1500CST and they moved east southeast through southern Illinois through around 1900CST. One very strong storm produced hail up to the size of golf balls in Jackson County, and went on to produce hail up to the size of quarters from Carterville to Marion in Williamson County. Other strong storms produced smaller hail over portions of Union, Saline, and Wayne Counties.

View location on OpenStreetMap → (37.7431, -89.0224)

Source: NOAA Storm Events Database, event_id 1259829. Narrative written by the NWS forecast office that issued the report.