Upper Alton, IL

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.

Hail swath map for Upper Alton, IL on April 27, 2026 showing 1.50 inch hail.
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%
NOAA POSH probability
Measured on the ground
2.00″
3.3 mi away · Trained Spotter

NOAA's Probability of Severe Hail 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 MRMS radar (MESH), which runs about ±0.25″ against ground truth. It is canvass-targeting quality, not claim evidence.

Roofing contractors

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Homeowners

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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 towns hit on April 27, 2026

Topeka, KS2.00″Rowlett, TX2.00″Rockwall, TX2.00″Garland, TX1.50″Richardson, TX1.50″Chesterfield, MO1.50″Wildwood, MO1.50″Alton, IL1.50″Greenville, TX1.50″Edwardsville, IL1.50″University Park, TX1.50″Gardner, KS1.50″
Every Illinois city hit on April 27, 2026 →

Other hail dates for Upper Alton

May 4, 20261.00″August 16, 20251.00″August 12, 20251.00″August 12, 20231.00″July 29, 20231.00″
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 spotters or officials. These are measured stones, not radar estimates, so they are the closest thing to proof that hail actually reached the ground.

  • 2.00″ hen egg size Trained Spotter
    2 WNW Bethalto, IL · 3.3 mi away6:56 PM CDTMadison County
  • 1.75″ golf ball size Amateur Radio
    Alton, IL · 0.8 mi away6:50 PM CDTMadison County
  • 1.75″ golf ball size Public
    1 NW Bethalto, IL · 4.9 mi away7:07 PM CDTMadison County

    Report from mPING: Golf Ball (1.75 in.).

  • 1.75″ golf ball size Public
    3 SSW Prairietown, IL · 12.0 mi away7:13 PM CDTMadison County
  • 1.50″ half dollar size Public
    2 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 Public
    2 N Wood River, IL · 4.1 mi away7:00 PM CDTMadison County
  • 1.25″ half dollar size Amateur Radio
    Bethalto, IL · 5.5 mi away7:10 PM CDTMadison County
  • 1.25″ half dollar size Public
    Bethalto, IL · 5.5 mi away7:03 PM CDTMadison County
  • 1.25″ half dollar size Public
    3 W Carpenter, IL · 10.8 mi away7:15 PM CDTMadison County

    Report from mPING: Half Dollar (1.25 in.).

  • 1.25″ half dollar size Public
    1 W Jennings, MO · 14.7 mi away6:46 AM CDTSt. Louis County

    Report from mPING: Half Dollar (1.25 in.).

  • 1.00″ quarter size Public
    1 NE Alton, IL · 1.1 mi away6:59 PM CDTMadison County

    Report from mPING: Quarter (1.00 in.).

  • 1.00″ quarter size Public
    2 S Godfrey, IL · 2.0 mi away6:52 PM CDTMadison County

    Hail from the sizes of dimes to quarters.

  • 1.00″ quarter size Trained Spotter
    1 S Godfrey, IL · 4.0 mi away6:54 PM CDTMadison County
  • 1.00″ quarter size Public
    Dorsey, IL · 9.1 mi away7:10 PM CDTMadison County
  • 1.00″ quarter size Public
    3 W Carpenter, IL · 10.8 mi away7:11 PM CDTMadison County

    Report from mPING: Quarter (1.00 in.).

  • 1.00″ quarter size Public
    1 S Bunker Hill, IL · 13.2 mi away7:09 PM CDTMacoupin County

    Report from mPING: Quarter (1.00 in.).

  • 1.00″ quarter size Public
    Bunker Hill, IL · 14.0 mi away7:08 PM CDTMacoupin County

    Report from mPING: Quarter (1.00 in.).

  • 1.00″ quarter size Trained Spotter
    Glen Carbon, IL · 14.3 mi away2:21 PM CDTMadison County
  • 0.88″ penny size Public
    1 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.

FAQ

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.

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