Hail map for Upper Alton, IL — April 27, 2026
NOAA radar detected hail up to 1.50″ — half dollar size — within 5 miles of Upper Alton on April 27, 2026.
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- Max hail size
- 1.50″
- half dollar
- Impact rating
- 5/10
- from stone size
- Size bands over the city
- 2
- distinct radar bands
- Reached the ground
- 70%
- Severe-hail probability
- Measured on the ground
- 2.00″
- 3.3 mi away · Trained Spotter
Severe-hail probability peaked at 70% over Upper Alton that day — high: around even odds of 1″ hail reaching the ground. 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.
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This page covers Upper 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.
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Other hail dates for Upper Alton
Every storm over Upper Alton →What people on the ground measured in Upper Alton, IL on April 27, 2026
19 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 Trained Spotter2 WNW Bethalto, IL · 3.3 mi away6:56 PM CDTMadison County
- 1.75″ golf ball size Amateur RadioAlton, IL · 0.8 mi away6:50 PM CDTMadison County
- 1.75″ golf ball size Public1 NW Bethalto, IL · 4.9 mi away7:07 PM CDTMadison County
Report from mPING: Golf Ball (1.75 in.).
- 1.75″ golf ball size Public3 SSW Prairietown, IL · 12.0 mi away7:13 PM CDTMadison County
- 1.50″ half dollar size Public2 NW Alton, IL · 2.5 mi away6:55 PM CDTMadison County
Report from mPING: Ping Pong Ball (1.50 in.).
- 1.25″ half dollar size Public2 N Wood River, IL · 4.1 mi away7:00 PM CDTMadison County
- 1.25″ half dollar size Amateur RadioBethalto, IL · 5.5 mi away7:10 PM CDTMadison County
- 1.25″ half dollar size PublicBethalto, IL · 5.5 mi away7:03 PM CDTMadison County
- 1.25″ half dollar size Public3 W Carpenter, IL · 10.8 mi away7:15 PM CDTMadison County
Report from mPING: Half Dollar (1.25 in.).
- 1.25″ half dollar size Public1 W Jennings, MO · 14.7 mi away6:46 AM CDTSt. Louis County
Report from mPING: Half Dollar (1.25 in.).
- 1.00″ quarter size Public1 NE Alton, IL · 1.1 mi away6:59 PM CDTMadison County
Report from mPING: Quarter (1.00 in.).
- 1.00″ quarter size Public2 S Godfrey, IL · 2.0 mi away6:52 PM CDTMadison County
Hail from the sizes of dimes to quarters.
- 1.00″ quarter size Trained Spotter1 S Godfrey, IL · 4.0 mi away6:54 PM CDTMadison County
- 1.00″ quarter size PublicDorsey, IL · 9.1 mi away7:10 PM CDTMadison County
- 1.00″ quarter size Public3 W Carpenter, IL · 10.8 mi away7:11 PM CDTMadison County
Report from mPING: Quarter (1.00 in.).
- 1.00″ quarter size Public1 S Bunker Hill, IL · 13.2 mi away7:09 PM CDTMacoupin County
Report from mPING: Quarter (1.00 in.).
- 1.00″ quarter size PublicBunker Hill, IL · 14.0 mi away7:08 PM CDTMacoupin County
Report from mPING: Quarter (1.00 in.).
- 1.00″ quarter size Trained SpotterGlen Carbon, IL · 14.3 mi away2:21 PM CDTMadison County
- 0.88″ penny size Public1 NW Florissant, MO · 12.4 mi away12:35 PM CDTSt. Louis County
Pea to nickel sized hail lasted about 5 minutes.
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 Upper Alton, IL?
This page is one storm. If you are deciding which tool to work Upper 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.
Upper Alton hail on April 27, 2026
NOAA radar estimated stones up to 1.50 inches — half dollar size — within about 5 miles of Upper Alton that day, across 2 distinct size bands. Sizes vary street to street inside a single swath.