How big was the hail on September 17, 2026?

The maximum estimated stone size anywhere in the country that day was 2.50 inches, over Blackfoot, ID. 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 radar, ingested directly from the public NOAA archive. The estimated stone size 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 17, 2026

Hail map — September 17, 2026

Name: US hail map — September 17, 2026
Creator: HailMate

NOAA radar detected hail of an inch or more over 13 cities across 3 states on September 17, 2026. The largest stones — 2.50″, hen egg size — fell over Blackfoot, ID.

Hail swath map for Blackfoot, ID on September 17, 2026 showing 2.50 inch hail. — Largest rendered swath of the day: Blackfoot, ID — 2.50″ hail. Each city below has its own map for this storm.

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The September 17, 2026 swath — and every other storm since 2023 across your state
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States hit: 3
Cities hit: 13
Largest stone: 2.50″; hen egg size
Impact rating: 8/10; from stone size

Sizes come from NOAA radar, which runs about ±0.25″ against ground truth. It is canvass-targeting quality, not claim evidence.

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 17, 2026

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

Idaho6 cities · 2.50″Utah2 cities · 1.25″Missouri5 cities · 1.25″

Hardest hit on September 17, 2026

Blackfoot, ID2.50″ · hen egg Idaho Falls, ID1.75″ · golf ball O'Fallon, MO1.25″ · half dollar Pocatello, ID1.25″ · half dollar Saint Peters, MO1.25″ · half dollar Wentzville, MO1.25″ · half dollar Springville, UT1.25″ · half dollar Ammon, ID1.25″ · half dollar Lake Saint Louis, MO1.25″ · half dollar Chubbuck, ID1.25″ · half dollar Dardenne Prairie, MO1.25″ · half dollar Provo, UT1.00″ · quarter Rexburg, ID1.00″ · quarter

What people on the ground measured in the US on September 17, 2026

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.

2.50″ hen egg size Public
1 NNE Rose, ID8:50 PM MDTBingham County
Photo of tennis ball sized hail. Report via Facebook.
1.75″ golf ball size Public
Blackfoot, ID9:20 PM MDTBingham County
Multiple reports of quarter to golf ball sized hail in the western Blackfoot area. Reports via Facebook.
1.75″ golf ball size Public
1 SSW Blackfoot, ID10:10 PM MDTBingham County
Report via Facebook.
1.75″ golf ball size Public
3 ENE Rose, ID10:12 PM MDTBingham County
Golf ball sized hail. Windshields damaged. Report via Facebook.
1.75″ golf ball size Public
2 WNW Shelley, ID10:30 PM MDTBingham County
Reports of hail up to the size of golf balls in the Journeys End Neighborhood. Reports via Facebook.
1.50″ half dollar size Public
Midway, UT7:00 PM MDTWasatch County
1.50″ half dollar size Storm Chaser
9 ESE Broadwater, NE8:56 PM CDTMorrill County
Report of 1.5 inch hail on U-26 between Broadwater and Lisco.
1.50″ half dollar size Public
1 E Blackfoot, ID9:00 PM MDTBingham County
1.25″ half dollar size Public
Gannett, ID9:40 AM MDTBlaine County
1.25″ half dollar size Public
3 E Rose, ID10:20 AM MDTBingham County
Report via Facebook.
1.25″ half dollar size Public
2 S Moreland, ID9:10 PM MDTBingham County
Corrects previous hail report from 2 S Moreland. Corrected for accurate timing. In the Thomas area. Report via Facebook.
1.25″ half dollar size Public
2 NW Blackfoot, ID9:15 PM MDTBingham County
Report via Facebook.
1.25″ half dollar size Public
3 E Rose, ID10:20 PM MDTBingham County
Corrects previous hail report from 3 E Rose. Report via Facebook.
1.25″ half dollar size Public
Firth, ID10:30 PM MDTBingham County
Report via Facebook.
1.25″ half dollar size Public
2 S Moreland, ID11:40 PM MDTBingham County
In the Thomas area. Report via Facebook.

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

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.

Other hail days

October 30, 202614 cities · 1.50″October 29, 20261 city · 1.25″October 28, 20267 cities · 1.50″October 25, 20265 cities · 1.75″October 24, 20264 cities · 1.75″October 23, 202610 cities · 2.00″October 22, 202622 cities · 3.00″October 21, 202627 cities · 2.00″October 20, 202611 cities · 2.00″October 19, 20261 city · 2.00″October 14, 20261 city · 1.25″October 13, 202610 cities · 1.75″

Every state with hail on record →

FAQ

US hail on September 17, 2026

NOAA radar put hail of an inch or more over 13 cities across 3 states on September 17, 2026. The largest stones — 2.50 inches, hen egg size — were over Blackfoot, ID. Every state hit is listed on this page, and every city under it.

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