How big was the hail on September 17, 2024?

The maximum estimated stone size anywhere in the country that day was 1.00 inches, over Alafaya, FL. 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, 2024

Hail map — September 17, 2024

Name: US hail map — September 17, 2024
Creator: HailMate

NOAA radar detected hail of an inch or more over 1 city across 1 state on September 17, 2024. The largest stones — 1.00″, quarter size — fell over Alafaya, FL.

Hail swath map for Alafaya, FL on September 17, 2024 showing 1.00 inch hail. — Largest rendered swath of the day: Alafaya, FL — 1.00″ hail. Each city below has its own map for this storm.

Roofing contractors

Claim your live interactive hail map

Every address in your state at once — three years of NOAA hail swaths drawn on a map you can zoom, filter and actually work.

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.

$79/moall of your state, not one storm day

The September 17, 2024 swath — and every other storm since 2023 across your state
GPS door-knocking — pins, photos and who you have already hit
Jobs, contacts, estimates and invoices included
An alert the next time your state gets hit

See the hail map See a sample map first

HailTrace charges $229 for this one day, once. $79 here is all of your state, every day.

States hit: 1
Cities hit: 1
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.

Check my address

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 17, 2024

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

Florida1 city · 1.00″

Hardest hit on September 17, 2024

Alafaya, FL1.00″ · quarter

What people on the ground measured in the US on September 17, 2024

9 reports filed with the National Weather Service — 2 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.

1.75″ golf ball size Trained Spotter
2 W Bloomfield, MT5:10 PM MDTDawson County
Golf ball size hail around 5:10 PM. Wind gusts in the upper 40s.
1.25″ half dollar size Public
4 S Flaxville, MT5:53 PM MDTDaniels County
Relayed via public Facebook report. Time estimated by radar.
1.25″ half dollar size Public
Poplar, MT6:10 PM MDTRoosevelt County
Relayed via public Facebook photo report.
1.00″ quarter size Public
4 NNW Ghost Ranch, NM5:40 PM MDTRio Arriba County
Quarter size hail at MM232 along U.S. Hwy 84.
0.75″ penny size Public
31 WNW Castle Rock, SD7:50 PM CDTButte County
0.50″ penny size Cocorahs
6 NE Rio Rancho, NM2:40 PM MDTSandoval County
Hail completely covered the ground and took 30 minutes to melt.
0.50″ penny size Public
7 WSW Harding, SD8:10 PM CDTHarding County
0.25″ penny size Cocorahs
5 W Pagosa Springs, CO4:15 PM MDTArchuleta County
0.25″ penny size Trained Spotter
4 WSW Pagosa Springs, CO4:45 PM MDTArchuleta 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 17, 2024

NOAA radar put hail of an inch or more over 1 city across 1 state on September 17, 2024. The largest stones — 1.00 inches, quarter size — were over Alafaya, FL. Every state hit is listed on this page, and every city under it.

Knock the 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