Illinois hail map — March 31, 2026
NOAA radar detected hail of an inch or more over 3 Illinois cities on March 31, 2026. The largest stones — 1.50″, half dollar size — fell over Joliet.
- Cities hit
- 3
- in Illinois
- Largest stone
- 1.50″
- half dollar size
- Impact rating
- 5/10
- from stone size
Sizes come from NOAA MRMS radar (MESH), which runs about ±0.25″ against ground truth. It is canvass-targeting quality, not claim evidence.
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Illinois cities hit on March 31, 2026
What people on the ground measured in Illinois on March 31, 2026
12 reports filed with the National Weather Service — 4 from trained spotters or officials. These are measured stones, not radar estimates, so they are the closest thing to proof that hail actually reached the ground.
- 1.75″ golf ball size Trained SpotterRockdale, IL9:21 AM CDTWill County
Photo shared on social media showing several large hailstones at Moen Avenue and Midland Avenue in Rockdale. The largest hailstones were approximately golf ball size. Time estimated from radar.
- 1.75″ golf ball size Trained Spotter2 SSE Ingalls Park, IL9:27 AM CDTWill County
- 1.75″ golf ball size Broadcast Media1 NW Easton, IL9:27 AM CDTMason County
- 1.75″ golf ball size PublicNew Lenox, IL9:34 AM CDTWill County
Multiple public reports of quarter to golf ball size hail in New Lenox. Time estimated from radar.
- 1.50″ half dollar size Trained Spotter4 WNW Washington, IL9:17 AM CDTTazewell County
- 1.50″ half dollar size Public1 S Preston Heights, IL9:34 AM CDTWill County
Photo shared of approximately ping pong ball size hail at Route 53 and Laraway Road. Time estimated from radar.
- 1.50″ half dollar size PublicPolo, IL10:16 AM CDTOgle County
Largest hailstone was measured to be 1.5 inches in diameter. Most hail was approximately half an inch in diameter. Time estimated from radar.
- 1.25″ half dollar size PublicOquawka, IL7:40 AM CDTHenderson County
Passed along by broadcast media.
- 1.25″ half dollar size Public3 SSE Ingalls Park, IL9:29 AM CDTWill County
Report from mPING.
- 1.25″ half dollar size Broadcast Media3 ENE Washington, IL9:33 AM CDTTazewell County
East Cruger & DeeMack Road. Delayed report. Time estimated from radar.
- 1.25″ half dollar size Broadcast MediaEureka, IL9:44 AM CDTWoodford County
- 1.00″ quarter size Trained SpotterHollowayville, IL6:36 AM CDTBureau County
Relayed via NWS Chicago. Spotter reports hail ranging from half into to quarter size.
Showing the 12 largest of 27 hail reports filed that day.
Reports come from the National Weather Service Local Storm Report feed, ingested every 15 minutes. A report records where the observer was, not the full extent of the swath — treat it as evidence about the storm, not about any one roof.
Other Illinois hail days
Illinois hail on March 31, 2026
NOAA radar put hail of an inch or more over 3 Illinois cities that day. The largest stones — 1.50 inches, half dollar size — were over Joliet. Every city hit is listed above with its own stone size.