Does this mean roofs in the area were damaged?

Radar measures stone size, not damage. Whether a particular roof was damaged depends on stone size, wind direction, roof age and material — only an inspection settles it. This tells you where it is worth looking.

How accurate is this hail map?

Sizes come from NOAA MRMS radar (MESH), which runs about ±0.25 inches against ground truth and resolves to roughly 1 km cells. That makes it canvass-targeting quality — good enough to pick the neighbourhoods worth knocking, not a substitute for claim evidence.

How do I see this swath on a real map of Chesterfield?

A HailMate plan puts the whole state around Chesterfield on an interactive map with this swath and three years of others already on it. $79/mo, and the canvassing tools come with it.

Chesterfield, MO

Hail map for Chesterfield, MO — April 17, 2026

Name: Hail map for Chesterfield, MO — April 17, 2026
Creator: HailMate

NOAA radar detected hail up to 1.00″ — quarter size — within 5 miles of Chesterfield on April 17, 2026.

Hail swath map for Chesterfield, MO on April 17, 2026 showing 1.00 inch hail.

Max hail size: 1.00″; quarter
Impact rating: 3/10; from stone size
Size bands over the city: 1; distinct radar bands
Measured on the ground: 1.00″; 2.4 mi away · Public

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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HailMate's canvassing map: hail swaths colour-banded by stone size, from yellow through red to purple, laid over a satellite view of a Texas territory, with hail swath and territory controls.

The whole state around Chesterfield, with this swath already on it
Three years of hail swaths, filterable by stone size
GPS door-knocking, pins, jobs and estimates — the full loop, not a preview
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Homeowners

Did hail hit your address?

This page covers Chesterfield 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 address

Free, and no account needed to look it up. If hail did hit, you can ask for a free inspection from a vetted local roofer.

Other towns hit on April 17, 2026

Ponca City, OK2.00″Janesville, WI1.50″Enid, OK1.50″Beloit, WI1.50″Freeport, IL1.50″Wichita, KS1.00″Saint Joseph, MO1.00″Wildwood, MO1.00″Wentzville, MO1.00″Marshalltown, IA1.00″Faribault, MN1.00″Derby, KS1.00″

Every Missouri city hit on April 17, 2026 →

Other hail dates for Chesterfield

August 16, 20261.00″April 27, 20261.50″May 16, 20252.00″May 26, 20241.50″April 1, 20242.00″

Every storm over Chesterfield →

What people on the ground measured in Chesterfield, MO on April 17, 2026

17 reports filed with the National Weather Service — 4 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.

1.00″ quarter size Public
3 WNW Chesterfield, MO · 2.4 mi away3:35 PM CDTSt. Louis County
1.00″ quarter size Public
2 S Harvester, MO · 3.9 mi away3:46 PM CDTSt. Charles County
Report from mPING: Quarter (1.00 in.).
1.00″ quarter size Public
2 ENE Weldon Spring, MO · 4.6 mi away3:40 PM CDTSt. Charles County
1.00″ quarter size Emergency Mngr
2 SSW Harvester, MO · 4.7 mi away3:42 PM CDTSt. Charles County
1.00″ quarter size Public
2 SE Harvester, MO · 4.8 mi away3:45 PM CDTSt. Charles County
Report from social media, largest hail stone around 1 inch.
1.00″ quarter size Public
Harvester, MO · 5.3 mi away3:45 PM CDTSt. Charles County
Report from mPING: Quarter (1.00 in.).
1.00″ quarter size Public
2 W Harvester, MO · 5.8 mi away3:39 PM CDTSt. Charles County
Report from mPING: Quarter (1.00 in.).
1.00″ quarter size Public
1 NE Harvester, MO · 6.7 mi away3:49 PM CDTSt. Charles County
Report from mPING: Quarter (1.00 in.).
1.00″ quarter size Trained Spotter
Cottleville, MO · 7.8 mi away3:48 PM CDTSt. Charles County
1.00″ quarter size Public
2 SW Saint Charles, MO · 7.8 mi away4:05 PM CDTSt. Charles County
Report from mPING: Quarter (1.00 in.).
1.00″ quarter size Public
3 NE Defiance, MO · 8.8 mi away3:25 PM CDTSt. Charles County
Corrects previous hail report from 3 NE Defiance. Report from mPING: Quarter (1.00 in.).
1.00″ quarter size Public
3 NE Defiance, MO · 8.8 mi away3:15 PM CDTSt. Charles County
Report from mPING: Quarter (1.00 in.).
1.00″ quarter size Public
3 NE Saint Charles, MO · 12.0 mi away4:15 PM CDTSt. Charles County
Report from mPING: Quarter (1.00 in.).
1.00″ quarter size Public
3 NNE Saint Charles, MO · 12.4 mi away4:08 PM CDTSt. Charles County
0.88″ penny size Trained Spotter
Harvester, MO · 6.0 mi away3:45 PM CDTSt. Charles County
0.88″ penny size Trained Spotter
2 ENE Harvester, MO · 7.0 mi away3:50 PM CDTSt. Charles County
Mostly dimes but up to nickel sized hail.
0.70″ penny size Public
3 SSW Orchard Farms, MO · 12.9 mi away4:12 PM CDTSt. Charles County
Time estimated from radar.

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

Chesterfield hail on April 17, 2026

NOAA radar estimated stones up to 1.00 inches — quarter size — within about 5 miles of Chesterfield that day, across 1 distinct size band. Sizes vary street to street inside a single swath.

Knock the Chesterfield streets this storm hit

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