Does this mean roofs in the area 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. This tells you where it is worth looking.

How accurate is this hail map?

Sizes come from NOAA MRMS radar (MESH), which runs about ±0.25 inches against ground truth and resolves to roughly 1 km cells. That makes it canvass-targeting quality — good enough to pick the neighbourhoods worth knocking, not a substitute for claim evidence.

How do I see this swath on a real map of Decatur?

A HailMate plan puts the whole state around Decatur on an interactive map with this swath and three years of others already on it. $79/mo, and the canvassing tools come with it.

Decatur, IL

Hail map for Decatur, IL — March 31, 2024

Name: Hail map for Decatur, IL — March 31, 2024
Creator: HailMate

NOAA radar detected hail up to 1.00″ — quarter size — within 5 miles of Decatur on March 31, 2024.

Hail swath map for Decatur, IL on March 31, 2024 showing 1.00 inch hail.

Max hail size: 1.00″; quarter
Impact rating: 3/10; from stone size
Size bands over the city: 1; distinct radar bands
Measured on the ground: 2.50″; 1.6 mi away · Broadcast Media

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

Work Decatur on the live hail map

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.

The whole state around Decatur, with this swath already on it
Three years of hail swaths, filterable by stone size
GPS door-knocking, pins, jobs and estimates — the full loop, not a preview
Month-to-month, cancel anytime

Get started

One state, one user, everything included. $79/mo, cancel anytime.

Homeowners

Did hail hit your address?

This page covers Decatur 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.

Check my address

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.

Other hail dates for Decatur

June 17, 20261.50″May 19, 20241.00″

Every storm over Decatur →

What people on the ground measured in Decatur, IL on March 31, 2024

22 reports filed with the National Weather Service — 6 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, IL · 1.6 mi away7:52 PM CDTMacon County
Photo from public of tennis ball size hail.
2.00″ hen egg size Public
2 SSW Forsyth, IL · 4.2 mi away7:50 PM CDTMacon County
Picture via social media; Wolf Road.
1.75″ golf ball size Broadcast Media
Oakley, IL · 1.6 mi away8:05 PM CDTMacon County
1.75″ golf ball size Public
1 NW Mount Zion, IL · 5.3 mi away7:58 PM CDTMacon County
Picture via social media.
1.75″ golf ball size Public
Forsyth, IL · 5.5 mi away7:46 PM CDTMacon County
Picture via social media.
1.75″ golf ball size Mesonet
Mount Zion, IL · 6.1 mi away8:00 PM CDTMacon County
SWOP report of golf ball size hail with photo.
1.75″ golf ball size Public
Forsyth, IL · 6.2 mi away7:55 PM CDTMacon County
Report from mPING: Golf Ball (1.75 in.).
1.75″ golf ball size Emergency Mngr
Oreana, IL · 6.2 mi away7:57 PM CDTMacon County
1.75″ golf ball size Broadcast Media
Forsyth, IL · 6.2 mi away8:00 PM CDTMacon County
Golf ball size hail for 10 minutes.
1.75″ golf ball size Public
2 W Warrensburg, IL · 9.9 mi away7:40 PM CDTMacon County
Report from mPING: Golf Ball (1.75 in.).
1.75″ golf ball size Emergency Mngr
Latham, IL · 14.1 mi away7:22 PM CDTLogan County
1.75″ golf ball size Emergency Mngr
Latham, IL · 14.1 mi away7:30 PM CDTLogan County
1.50″ half dollar size Emergency Mngr
1 W Decatur, IL · 1.6 mi away7:50 PM CDTMacon County
Ping pong size hail on west side of Decatur.
1.50″ half dollar size Broadcast Media
2 ESE Decatur, IL · 1.9 mi away8:00 PM CDTMacon County
Ping pong size hail at Decatur Zoo with photo.
1.50″ half dollar size Trained Spotter
Forsyth, IL · 6.2 mi away7:55 PM CDTMacon County
1.25″ half dollar size Public
2 W Decatur, IL · 1.3 mi away7:52 PM CDTMacon County
1.25″ half dollar size Public
1 SW Decatur Airport, IL · 4.2 mi away8:03 PM CDTMacon County
Report from mPING: Half Dollar (1.25 in.).
1.25″ half dollar size Public
2 NW Mount Zion, IL · 4.9 mi away8:12 PM CDTMacon County
Report from mPING: Half Dollar (1.25 in.).
1.00″ quarter size Public
2 N Decatur, IL · 2.9 mi away7:50 PM CDTMacon County
Report from mPING: Quarter (1.00 in.).
1.00″ quarter size Public
1 NW Mount Zion, IL · 5.3 mi away8:01 PM CDTMacon County
Report from mPING: Quarter (1.00 in.).
1.00″ quarter size Emergency Mngr
Warrensburg, IL · 8.7 mi away7:38 PM CDTMacon County
0.75″ penny size Mesonet
1 SW Decatur, IL · 1.1 mi away7:50 PM CDTMacon County
Dime size hail reported 1 mile SW of Millikin University.

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.

FAQ

Decatur hail on March 31, 2024

NOAA radar estimated stones up to 1.00 inches — quarter size — within about 5 miles of Decatur that day, across 1 distinct size band. Sizes vary street to street inside a single swath.

Knock the Decatur streets this storm hit

Your whole state at street level, with this swath already on the map — $79/mo, cancel anytime.

One state, everything included · from $79/mo · month-to-month, cancel anytime