Hail map for O'Fallon, MO — April 27, 2026
Hail up to 1.25″ — half dollar size — was estimated within 5 miles of O'Fallon on April 27, 2026.
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- Max hail size
- 1.25″
- half dollar
- Impact rating
- 4/10
- from stone size
- Size bands over the city
- 2
- distinct radar bands
- Reached the ground
- 30%
- Severe-hail probability
- Measured on the ground
- 1.50″
- 14.6 mi away · Public
Severe-hail probability peaked at 30% over O'Fallon that day — low to moderate: the radar signature was there, ground impact less certain. 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 O'Fallon 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 O'Fallon, MO on April 27, 2026
14 reports filed with the National Weather Service — 1 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.
- 1.50″ half dollar size Public1 SW Bridgeton, MO · 14.6 mi away1:34 PM CDTSt. Louis County
Report from mPING: Ping Pong Ball (1.50 in.).
- 1.25″ half dollar size Amateur Radio2 NNE O'Fallon, MO · 0.0 mi away6:39 PM CDTSt. Charles County
- 1.25″ half dollar size Amateur Radio1 NNE O'Fallon, MO · 0.7 mi away6:35 PM CDTSt. Charles County
- 1.25″ half dollar size Public3 NE O'Fallon, MO · 1.6 mi away6:36 PM CDTSt. Charles County
Report from mPING: Half Dollar (1.25 in.).
- 1.25″ half dollar size Public1 E Clarkson Valley, MO · 14.0 mi away1:38 PM CDTSt. Louis County
- 1.00″ quarter size Public2 E O'Fallon, MO · 2.1 mi away6:30 PM CDTSt. Charles County
Near Mexico Road and Salt Lick.
- 1.00″ quarter size NWS Employee2 WNW O'Fallon, MO · 2.6 mi away6:35 PM CDTSt. Charles County
- 1.00″ quarter size Public4 NW Saint Peters, MO · 3.5 mi away6:37 PM CDTSt. Charles County
- 1.00″ quarter size Public2 S Harvester, MO · 8.6 mi away12:25 PM CDTSt. Charles County
Report from mPING: Quarter (1.00 in.).
- 1.00″ quarter size Public2 S Harvester, MO · 8.6 mi away12:20 PM CDTSt. Charles County
Corrects previous hail report from 2 S Harvester. Report from mPING: Quarter (1.00 in.).
- 1.00″ quarter size Public1 N Chesterfield, MO · 11.7 mi away1:35 PM CDTSt. Louis County
- 1.00″ quarter size Public1 N Winfield, MO · 13.9 mi away5:30 PM CDTLincoln County
- 0.88″ penny size Public1 E Saint Peters, MO · 6.8 mi away12:17 PM CDTSt. Charles County
- 0.70″ penny size PublicOld Monroe, MO · 8.7 mi away3:05 PM CDTLincoln County
These are verified ground reports, updated 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 O'Fallon, MO?
This page is one storm. If you are deciding which tool to work O'Fallon, MO 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.
O'Fallon hail on April 27, 2026
Hail up to 1.25 inches — half dollar size — was estimated within about 5 miles of O'Fallon that day, across 2 distinct size bands. Sizes vary street to street inside a single swath.