How big was the hail on August 17, 2025?

The maximum estimated stone size anywhere in the country that day was 1.50 inches, over Florissant, MO. Sizes vary street to street inside a single swath, so a city's figure is the largest radar estimated anywhere within about 5 miles of it.

Where does this hail data come from?

NOAA MRMS radar, specifically the Maximum Estimated Size of Hail product, ingested directly from the public NOAA archive. It runs about a quarter of an inch against ground truth, which makes it good for deciding where to look and not a substitute for an inspection.

Does this mean roofs 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. These figures tell you where it is worth looking.

How do I see the actual swath on a map?

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

United States · August 17, 2025

Hail map — August 17, 2025

Name: US hail map — August 17, 2025
Creator: HailMate

NOAA radar detected hail of an inch or more over 21 cities across 8 states on August 17, 2025. The largest stones — 1.50″, half dollar size — fell over Florissant, MO.

Hail swath map for Florissant, MO on August 17, 2025 showing 1.50 inch hail. — Largest rendered swath of the day: Florissant, MO — 1.50″ hail. Each city below has its own map for this storm.

States hit: 8
Cities hit: 21
Largest stone: 1.50″; half dollar size
Impact rating: 5/10; from stone size

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 your area 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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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.

States hit on August 17, 2025

Every state where NOAA radar put an inch or more of hail over a city that day, biggest stone first.

Missouri6 cities · 1.50″Louisiana8 cities · 1.00″Iowa1 city · 1.00″Mississippi1 city · 1.00″Oklahoma2 cities · 1.00″Indiana1 city · 1.00″Arkansas1 city · 1.00″Ohio1 city · 1.00″

What people on the ground measured in the US on August 17, 2025

12 reports filed with the National Weather Service — 8 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.

1.75″ golf ball size Public
5 NNW Appam, ND9:50 PM CDTDivide County
Delayed report relayed by broadcast media. Multiple farmers reported penny to golf ball size hail and major hail damage to crops. An entire field of canola was lost.
1.75″ golf ball size Public
Ainsworth, NE9:53 PM CDTBrown County
Golf ball sized hail in Ainsworth. Time estimated from radar.
1.00″ quarter size Public
Wind Cave Visitors Cent, SD2:36 PM CDTCuster County
mPING report
1.00″ quarter size Trained Spotter
1 WNW Wind Cave Visitor, SD2:39 PM CDTCuster County
1.00″ quarter size Trained Spotter
6 SSE Brownsville, SD4:52 PM CDTLawrence County
1.00″ quarter size Trained Spotter
Conowingo, MD6:00 PM EDTCecil County
Trained spotter reports hail around quarter size, possibly slightly larger, in Conowingo along US-222.
1.00″ quarter size Emergency Mngr
1 E Webster State Park, KS7:30 PM CDTRooks County
Reported on the south end of Webster Dam.
1.00″ quarter size Public
25 NNE Ellsworth, NE8:15 PM CDTSheridan County
Quarter size hail with 40 to 50 mph winds.
0.70″ penny size Trained Spotter
Agra, KS6:05 PM CDTPhillips County
0.50″ penny size Trained Spotter
Deadwood, SD5:38 PM CDTLawrence County
0.25″ penny size Trained Spotter
6 WNW Stanford, MT4:20 PM MDTJudith Basin County
Pea size hail and heavy rain.
0.25″ penny size Trained Spotter
5 SW Stanford, MT4:23 PM MDTJudith Basin County
Pea size hail. Wind gusts estimated around 45 mph.

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.

Other hail days

August 19, 202620 cities · 2.00″August 18, 20266 cities · 1.50″August 17, 20266 cities · 1.00″August 16, 202610 cities · 1.50″August 15, 20268 cities · 1.50″August 14, 202611 cities · 2.00″August 13, 202616 cities · 2.00″August 12, 202610 cities · 1.50″August 11, 202633 cities · 2.00″August 10, 202623 cities · 1.50″August 9, 202649 cities · 1.50″August 8, 20265 cities · 1.50″

Every state with hail on record →

FAQ

US hail on August 17, 2025

NOAA radar put hail of an inch or more over 21 cities across 8 states on August 17, 2025. The largest stones — 1.50 inches, half dollar size — were over Florissant, MO. Every state hit is listed on this page, and every city under it.

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