How big was the hail on March 31, 2024?

The maximum estimated stone size anywhere in the country that day was 1.00 inches, over Decatur, IL. 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 · March 31, 2024

Hail map — March 31, 2024

Name: US hail map — March 31, 2024
Creator: HailMate

NOAA radar detected hail of an inch or more over 1 city across 1 state on March 31, 2024. The largest stones — 1.00″, quarter size — fell over Decatur, IL.

Hail swath map for Decatur, IL on March 31, 2024 showing 1.00 inch hail. — Largest rendered swath of the day: Decatur, IL — 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 March 31, 2024

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

Illinois1 city · 1.00″

Hardest hit on March 31, 2024

Decatur, IL1.00″ · quarter

What people on the ground measured in the US on March 31, 2024

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.

2.50″ hen egg size Broadcast Media
2 NE Decatur, IL7:52 PM CDTMacon County
Photo from public of tennis ball size hail.
2.00″ hen egg size CO-OP Observer
Mount Pulaski, IL7:21 PM CDTLogan County
2.00″ hen egg size Public
2 SSW Forsyth, IL7:50 PM CDTMacon County
Picture via social media; Wolf Road.
1.75″ golf ball size Mesonet
Mason City, IL6:39 PM CDTMason County
Golf ball size hail 3 miles SW of Mason City.
1.75″ golf ball size Emergency Mngr
Middletown, IL6:56 PM CDTLogan County
Golf ball size hail in Middletown.
1.75″ golf ball size Emergency Mngr
Latham, IL7:22 PM CDTLogan County
1.75″ golf ball size Emergency Mngr
Latham, IL7:30 PM CDTLogan County
1.75″ golf ball size Public
2 W Warrensburg, IL7:40 PM CDTMacon County
Report from mPING: Golf Ball (1.75 in.).
1.75″ golf ball size Public
Forsyth, IL7:46 PM CDTMacon County
Picture via social media.
1.75″ golf ball size Public
Forsyth, IL7:55 PM CDTMacon County
Report from mPING: Golf Ball (1.75 in.).
1.75″ golf ball size Emergency Mngr
Oreana, IL7:57 PM CDTMacon County
1.75″ golf ball size Public
1 NW Mount Zion, IL7:58 PM CDTMacon County
Picture via social media.
1.75″ golf ball size Mesonet
Mount Zion, IL8:00 PM CDTMacon County
SWOP report of golf ball size hail with photo.
1.75″ golf ball size Broadcast Media
Forsyth, IL8:00 PM CDTMacon County
Golf ball size hail for 10 minutes.
1.75″ golf ball size Broadcast Media
Oakley, IL8:05 PM CDTMacon County

Showing the 15 largest of 88 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 March 31, 2024

NOAA radar put hail of an inch or more over 1 city across 1 state on March 31, 2024. The largest stones — 1.00 inches, quarter size — were over Decatur, IL. Every state hit is listed on this page, and every city under it.

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