How big was the hail on September 20, 2025?

The maximum estimated stone size anywhere in the country that day was 1.50 inches, over Owasso, OK. 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 · September 20, 2025

Hail map — September 20, 2025

Name: US hail map — September 20, 2025
Creator: HailMate

NOAA radar detected hail of an inch or more over 4 cities across 2 states on September 20, 2025. The largest stones — 1.50″, half dollar size — fell over Owasso, OK.

Hail swath map for Owasso, OK on September 20, 2025 showing 1.50 inch hail. — Largest rendered swath of the day: Owasso, OK — 1.50″ hail. Each city below has its own map for this storm.

States hit: 2
Cities hit: 4
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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States hit on September 20, 2025

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

Oklahoma3 cities · 1.50″Missouri1 city · 1.00″

Hardest hit on September 20, 2025

Owasso, OK1.50″ · half dollar Tulsa, OK1.00″ · quarter Joplin, MO1.00″ · quarter Ponca City, OK1.00″ · quarter

What people on the ground measured in the US on September 20, 2025

15 reports filed with the National Weather Service — 5 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 Trained Spotter
4 W Owasso, OK8:48 PM CDTTulsa County
Golf ball size hail.
1.25″ half dollar size Public
4 W Owasso, OK8:34 PM CDTTulsa County
Report from mPING: Half Dollar (1.25 in.).
1.25″ half dollar size Trained Spotter
3 S Collinsville, OK8:35 PM CDTTulsa County
Half dollar size hail.
1.25″ half dollar size Public
Decatur, AR12:01 AM CDTBenton County
1.00″ quarter size Public
Atlanta, IL1:15 PM CDTLogan County
Relayed by WCIA TV Media.
1.00″ quarter size Public
1 S Altamont, IL2:00 PM CDTEffingham County
Relayed by WCIA TV Media.
1.00″ quarter size Public
3 NNW Neffs, OH4:16 PM EDTBelmont County
1.00″ quarter size Public
2 S Oconee, IL3:49 PM CDTShelby County
Report from mPING: Quarter (1.00 in.).
1.00″ quarter size Emergency Mngr
4 S Fairmont, OK5:37 PM CDTGarfield County
1.00″ quarter size Public
Marcellus, MI7:00 PM EDTCass County
1.00″ quarter size Public
4 SE Billings, OK6:20 PM CDTNoble County
1.00″ quarter size Emergency Mngr
2 S Waukomis, OK7:01 PM CDTGarfield County
1.00″ quarter size Trained Spotter
6 WNW Washburn, TX7:58 PM CDTPotter County
Public call for quarter sized hail that was accumulating.
1.00″ quarter size Public
6 NW Washburn, TX8:01 PM CDTPotter County
Report from mPING: Quarter (1.00 in.).
1.00″ quarter size Public
3 W Owasso, OK8:50 PM CDTTulsa County
Report from mPING: Quarter (1.00 in.).

Showing the 15 largest of 29 hail reports filed that day.

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 September 20, 2025

NOAA radar put hail of an inch or more over 4 cities across 2 states on September 20, 2025. The largest stones — 1.50 inches, half dollar size — were over Owasso, OK. Every state hit is listed on this page, and every city under it.

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