Hail map for Alton, IL — May 3, 2026
NOAA radar detected hail up to 1.00″ — quarter size — within 5 miles of Alton on May 3, 2026.
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- Max hail size
- 1.00″
- quarter
- Impact rating
- 3/10
- from stone size
- Size bands over the city
- 1
- distinct radar bands
- Reached the ground
- 50%
- Severe-hail probability
- Measured on the ground
- 2.00″
- 1.6 mi away · Public
Severe-hail probability peaked at 50% over Alton that day — moderate: severe hail likely reached the ground somewhere nearby. It is a separate model from the size estimate above: one asks how big the stones were in the storm, the other asks whether they made it down.
Sizes come from NOAA radar, which runs about ±0.25″ against ground truth. It is canvass-targeting quality, not claim evidence.
Did hail hit your address?
This page covers Alton 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.
Check my addressFree, and no account needed to look it up. If hail did hit, you'll have the date and the stone size in writing — which is the first thing an adjuster asks for.
What people on the ground measured in Alton, IL on May 3, 2026
10 reports filed with the National Weather Service — 3 from trained observers or officials. These are measured stones, not radar estimates, so they are the closest thing to proof that hail actually reached the ground.
- 2.00″ hen egg size Public3 W Alton, IL · 1.6 mi away11:00 PM CDTMadison County
Email report showing 2 inch stone next to tape measure. time estimated from radar.
- 1.75″ golf ball size Public1 NE Alton, IL · 3.2 mi away10:58 PM CDTMadison County
Report from mPING: Golf Ball (1.75 in.).
- 1.75″ golf ball size Trained Spotter1 S Godfrey, IL · 4.1 mi away10:59 PM CDTMadison County
- 1.50″ half dollar size Public2 NW Alton, IL · 2.7 mi away10:55 PM CDTMadison County
Report from mPING: Ping Pong Ball (1.50 in.).
- 1.50″ half dollar size Amateur Radio1 NNE Bethalto, IL · 7.9 mi away11:05 PM CDTMadison County
- 1.00″ quarter size Amateur RadioAlton, IL · 2.3 mi away10:58 PM CDTMadison County
- 1.00″ quarter size Public3 SW Godfrey, IL · 2.5 mi away10:55 PM CDTMadison County
Report from mPING: Quarter (1.00 in.).
- 1.00″ quarter size Amateur RadioBethalto, IL · 7.4 mi away11:06 PM CDTMadison County
- 0.70″ penny size Trained Spotter3 NW Alton, IL · 2.1 mi away10:58 PM CDTMadison County
- 0.25″ penny size Emergency MngrElsah, IL · 10.1 mi away10:54 PM CDTJersey County
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.
Shopping for a hail app to work Alton, IL?
This page is one storm. If you are deciding which tool to work Alton, IL with all season, these compare the ones roofers actually buy — with every price taken from the vendor's own site and linked.
- Best hail tracking apps, comparedHailMate, HailTrace, Hail Recon, HailStrike and RadarScope — every published price sourced and linked, and who each one is genuinely right for.
- HailMate vs HailTraceStreet-level NOAA swaths on a map your crew can knock, with the CRM already inside — instead of quote-only meteorologist maps billed on top of one.
- Hail map apps for roofers (and the Hail Recon alternative)Every storm on one map instead of loading dates one at a time — plus the canvassing and the whole claim, monthly, for what one state costs them a year.
- Best canvassing apps, comparedHailMate, SalesRabbit, SPOTIO, Knockio, RoofLink and Badger Maps — every published price sourced and linked, and two of them publish none.
Alton hail on May 3, 2026
NOAA radar estimated stones up to 1.00 inches — quarter size — within about 5 miles of Alton that day, across 1 distinct size band. Sizes vary street to street inside a single swath.