How big was the hail on October 23, 2023?

The maximum estimated stone size anywhere in the country that day was 1.00 inches, over Madison, WI. 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 · October 23, 2023

Hail map — October 23, 2023

Name: US hail map — October 23, 2023
Creator: HailMate

NOAA radar detected hail of an inch or more over 1 city across 1 state on October 23, 2023. The largest stones — 1.00″, quarter size — fell over Madison, WI.

Hail swath map for Madison, WI on October 23, 2023 showing 1.00 inch hail. — Largest rendered swath of the day: Madison, WI — 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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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 October 23, 2023

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

Wisconsin1 city · 1.00″

Hardest hit on October 23, 2023

Madison, WI1.00″ · quarter

What people on the ground measured in the US on October 23, 2023

15 reports filed with the National Weather Service — 4 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.

1.50″ half dollar size Public
1 E Maple Bluff, WI3:25 PM CDTDane County
Size estimated from photo of hail on palm of hand reported via Facebook. Comment reported up to golf ball size hail and dented cars on east side of Madison.
1.25″ half dollar size Public
Maple Bluff, WI3:42 PM CDTDane County
Reported through web form.
1.00″ quarter size Emergency Mngr
Barneveld, WI2:45 PM CDTIowa County
1.00″ quarter size Public
3 NNE Cross Plains, WI2:55 PM CDTDane County
1.00″ quarter size Public
1 ESE Maple Bluff, WI3:22 PM CDTDane County
1.00″ quarter size Public
4 WNW Cottage Grove, WI3:30 PM CDTDane County
Picture of 1 inch hail taken at Hwy T and Felland Rd. Photo from Twitter. Time estimated from radar.
1.00″ quarter size Law Enforcement
Waterloo, WI3:51 PM CDTJefferson County
1.00″ quarter size Public
2 NW Watertown, WI4:05 PM CDTDodge County
Reported relayed via social media.
1.00″ quarter size Fire Dept/Rescue
1 SSE Spencer, IA11:55 PM CDTClay County
One inch hail reported.
1.00″ quarter size Public
1 E Spencer, IA12:07 AM CDTClay County
Photo of quarter sized hail reported via social media.
0.75″ penny size Trained Spotter
1 NW Sun Prairie, WI3:33 PM CDTDane County
0.75″ penny size Law Enforcement
1 WNW Blooming Prairie, MN12:59 AM CDTSteele County
0.25″ penny size Law Enforcement
Dodgeville, WI2:30 PM CDTIowa County
0.25″ penny size Trained Spotter
3 N Shiocton, WI2:36 PM CDTOutagamie County
0.25″ penny size NWS Employee
3 NW Howard, WI3:04 PM CDTBrown County

Showing the 15 largest of 17 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 October 23, 2023

NOAA radar put hail of an inch or more over 1 city across 1 state on October 23, 2023. The largest stones — 1.00 inches, quarter size — were over Madison, WI. Every state hit is listed on this page, and every city under it.

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