How big was the hail on September 12, 2024?

The maximum estimated stone size anywhere in the country that day was 1.00 inches, over Rapid City, SD. 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 12, 2024

Hail map — September 12, 2024

Name: US hail map — September 12, 2024
Creator: HailMate

NOAA radar detected hail of an inch or more over 2 cities across 2 states on September 12, 2024. The largest stones — 1.00″, quarter size — fell over Rapid City, SD.

Hail swath map for Rapid City, SD on September 12, 2024 showing 1.00 inch hail. — Largest rendered swath of the day: Rapid City, SD — 1.00″ hail. Each city below has its own map for this storm.

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The September 12, 2024 swath — and every other storm since 2023 across your state
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States hit: 2
Cities hit: 2
Largest stone: 1.00″; quarter size
Impact rating: 3/10; 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

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'll have the date and the stone size in writing — which is the first thing an adjuster asks for.

States hit on September 12, 2024

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

South Dakota1 city · 1.00″Pennsylvania1 city · 1.00″

Hardest hit on September 12, 2024

Rapid City, SD1.00″ · quarter New Castle, PA1.00″ · quarter

What people on the ground measured in the US on September 12, 2024

13 reports filed with the National Weather Service — 8 from trained observers or officials. These are measured stones, not radar estimates, so they are the closest thing to proof that hail actually reached the ground.

2.00″ hen egg size NWS Employee
1 NE Sheridan, WY3:10 PM MDTSheridan County
1.50″ half dollar size Public
1 NE Sheridan, WY3:00 PM MDTSheridan County
1.25″ half dollar size Trained Spotter
2 ENE Sheridan, WY3:13 PM MDTSheridan County
1.25″ half dollar size Public
Sheridan, WY3:17 PM MDTSheridan County
1.00″ quarter size Trained Spotter
Sheridan, WY3:00 PM MDTSheridan County
1.00″ quarter size Emergency Mngr
Sheridan, WY3:03 PM MDTSheridan County
1.00″ quarter size Public
2 W Ucross, WY4:16 PM MDTSheridan County
Mostly dime size, with a few quarter size hail.
0.88″ penny size Public
1 SSW Sheridan, WY3:00 PM MDTSheridan County
0.88″ penny size Trained Spotter
11 SW Coalwood, MT4:43 PM MDTPowder River County
0.88″ penny size Trained Spotter
Ismay, MT5:58 PM MDTCuster County
0.75″ penny size Public
4 N Hodges, MT6:53 PM MDTDawson County
Report from mPING: Dime (0.75 in.).
0.50″ penny size Trained Spotter
1 SSE Sheridan, WY3:10 PM MDTSheridan County
0.50″ penny size Trained Spotter
17 ENE Volborg, MT5:20 PM MDTCuster County

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

September 30, 20261 city · 2.00″September 28, 20261 city · 1.00″September 27, 20264 cities · 1.00″September 26, 20261 city · 1.00″September 25, 20263 cities · 1.00″September 23, 20262 cities · 1.00″September 22, 202617 cities · 1.00″September 21, 202665 cities · 2.00″September 20, 20268 cities · 1.50″September 19, 202637 cities · 1.50″September 18, 202623 cities · 2.00″September 17, 202619 cities · 1.50″

Every state with hail on record →

FAQ

US hail on September 12, 2024

NOAA radar put hail of an inch or more over 2 cities across 2 states on September 12, 2024. The largest stones — 1.00 inches, quarter size — were over Rapid City, SD. Every state hit is listed on this page, and every city under it.

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