Illinois hail map — April 27, 2026
NOAA radar detected hail of an inch or more over 8 Illinois cities on April 27, 2026. The largest stones — 1.50″, half dollar size — fell over Upper Alton.
- Cities hit
- 8
- 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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This page covers Illinois as a whole. Check your own address to see every storm on record for your roof — the date and the stone size for each one — and we'll email you the full report to keep.
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What people on the ground measured in Illinois on April 27, 2026
12 reports filed with the National Weather Service — 5 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.
- 2.50″ hen egg size Amateur RadioJerseyville, IL6:00 PM CDTJersey County
- 2.00″ hen egg size Trained Spotter2 WNW Bethalto, IL6:56 PM CDTMadison County
- 1.75″ golf ball size Trained SpotterVergennes, IL5:39 AM CDTJackson County
- 1.75″ golf ball size Trained SpotterDowell, IL5:51 AM CDTJackson County
- 1.75″ golf ball size Amateur RadioAlton, IL6:50 PM CDTMadison County
- 1.75″ golf ball size Public1 NW Bethalto, IL7:07 PM CDTMadison County
Report from mPING: Golf Ball (1.75 in.).
- 1.75″ golf ball size Public3 SSW Prairietown, IL7:13 PM CDTMadison County
- 1.50″ half dollar size Broadcast MediaSpringfield, IL8:57 AM CDTSangamon County
- 1.50″ half dollar size Broadcast Media1 SW Grandview, IL8:59 AM CDTSangamon County
- 1.50″ half dollar size Trained Spotter3 N Ridgway, IL10:44 AM CDTGallatin County
- 1.50″ half dollar size Public1 W Congerville, IL5:12 PM CDTWoodford County
Report from mPING: Ping Pong Ball (1.50 in.).
- 1.50″ half dollar size Emergency MngrJerseyville, IL5:55 PM CDTJersey County
Showing the 12 largest of 79 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 April 27, 2026
NOAA radar put hail of an inch or more over 8 Illinois cities that day. The largest stones — 1.50 inches, half dollar size — were over Upper Alton. Every city hit is listed above with its own stone size.