How big was the hail on September 4, 2025?

The maximum estimated stone size anywhere in the country that day was 1.00 inches, over Washington, UT. 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 4, 2025

Hail map — September 4, 2025

Name: US hail map — September 4, 2025
Creator: HailMate

NOAA radar detected hail of an inch or more over 1 city across 1 state on September 4, 2025. The largest stones — 1.00″, quarter size — fell over Washington, UT.

Hail swath map for Washington, UT on September 4, 2025 showing 1.00 inch hail. — Largest rendered swath of the day: Washington, UT — 1.00″ hail. Each city below has its own map for this storm.

States hit: 1
Cities hit: 1
Largest stone: 1.00″; quarter size
Impact rating: 3/10; 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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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.

Your whole state at street level, with this storm already on it
Three years of hail swaths, filterable by stone size
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Homeowners

Did hail hit your address?

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 September 4, 2025

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

Utah1 city · 1.00″

Hardest hit on September 4, 2025

Washington, UT1.00″ · quarter

What people on the ground measured in the US on September 4, 2025

15 reports filed with the National Weather Service. 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
Karns, TN12:35 PM CDTKnox County
Social Media photo of multiple golf ball size hail stones.
1.50″ half dollar size Public
1 ENE Karns, TN12:35 PM CDTKnox County
1.25″ half dollar size Public
4 W Pigeon Forge, TN2:20 AM CDTSevier County
1.25″ half dollar size Broadcast Media
4 W Karns, TN12:30 PM CDTKnox County
Broadcast media report of half dollar size hail off of Solway Road. Similar report in Karns.
1.25″ half dollar size Public
3 W Bradbury, TN3:35 PM CDTRoane County
1.00″ quarter size Public
4 NE Cedar Creek, TN12:10 PM CDTGreene County
1.00″ quarter size Public
2 WSW Karns, TN12:30 PM CDTKnox County
Nickel to quarter-sized hail near Hardin Valley area.
1.00″ quarter size Public
3 SE Bearden, TN1:07 PM CDTKnox County
Report from mPING: Quarter (1.00 in.).
1.00″ quarter size Public
1 N Tazewell, TN1:30 PM CDTClaiborne County
1.00″ quarter size Public
Sevierville, TN1:35 PM CDTSevier County
Social media video of dime to quarter size hail, time estimated based on radar.
1.00″ quarter size Public
5 NE Farragut, TN1:57 PM CDTKnox County
Report from mPING: Quarter (1.00 in.).
1.00″ quarter size Public
2 NNW Bradbury, TN3:00 PM CDTRoane County
1.00″ quarter size Public
Black Mountain, NC5:05 PM EDTBuncombe County
Observed along Laurel Circle.
0.88″ penny size Public
1 SE Sevierville, TN1:40 PM CDTSevier County
0.75″ penny size Public
5 NW Pellville, KY2:30 AM EDTDaviess County
Report from mPING: Dime (0.75 in.).

Showing the 15 largest of 22 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 4, 2025

NOAA radar put hail of an inch or more over 1 city across 1 state on September 4, 2025. The largest stones — 1.00 inches, quarter size — were over Washington, UT. Every state hit is listed on this page, and every city under it.

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