How big was the hail on September 18, 2023?

The maximum estimated stone size anywhere in the country that day was 1.00 inches, over Sioux City, IA. 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 18, 2023

Hail map — September 18, 2023

Name: US hail map — September 18, 2023
Creator: HailMate

NOAA radar detected hail of an inch or more over 1 city across 1 state on September 18, 2023. The largest stones — 1.00″, quarter size — fell over Sioux City, IA.

Hail swath map for Sioux City, IA on September 18, 2023 showing 1.00 inch hail. — Largest rendered swath of the day: Sioux City, IA — 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 18, 2023 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 18, 2023

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

Iowa1 city · 1.00″

Hardest hit on September 18, 2023

Sioux City, IA1.00″ · quarter

What people on the ground measured in the US on September 18, 2023

14 reports filed with the National Weather Service — 4 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.

1.00″ quarter size Public
2 NE Socorro, NM3:19 PM MDTSocorro County
1.00″ quarter size Public
1 SE Rio Grande Nature, NM4:07 PM MDTBernalillo County
Candelaria and Camino Caballete.
1.00″ quarter size Public
2 ESE Rio Grande Nature, NM4:08 PM MDTBernalillo County
12th and Candelaria; dime to quarter size hail.
1.00″ quarter size CO-OP Observer
2 ESE Rio Grande Nature, NM4:34 PM MDTBernalillo County
Corrects previous hail report from 2 ESE Rio Grande Nature Center.
1.00″ quarter size CO-OP Observer
2 ESE Rio Grande Nature, NM4:50 PM MDTBernalillo County
1.00″ quarter size Public
8 N Hoxie, KS7:15 PM CDTSheridan County
Delayed report via social media. Nickel to quarter sized hail observed.
1.00″ quarter size Trained Spotter
3 WSW Moville, IA12:50 AM CDTWoodbury County
A trained spotter reported quarter sized hail between Lawton and Moville. Time was estimated via Radar.
0.88″ penny size Public
1 W Clayton, KS6:00 PM CDTDecatur County
Delayed report via social media. Pea to nickel sized hail observed. Hail fell on and off over a span of 15 minutes.
0.75″ penny size NWS Employee
2 SSW Petroglyph Nation, NM3:58 PM MDTBernalillo County
0.75″ penny size Broadcast Media
1 NE Albuquerque, NM4:13 PM MDTBernalillo County
0.50″ penny size Public
Telluride, CO5:20 PM MDTSan Miguel County
Hailstones solidly covered the ground.
0.25″ penny size Public
Nucla, CO3:55 PM MDTMontrose County
0.25″ penny size Trained Spotter
Hoxie, KS7:09 PM CDTSheridan County
0.25″ penny size Trained Spotter
Hoxie, KS7:09 PM CDTSheridan 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 12, 202626 cities · 1.50″September 11, 202627 cities · 2.00″September 10, 20266 cities · 2.00″September 9, 20262 cities · 1.00″September 8, 202611 cities · 2.00″September 7, 202626 cities · 2.00″September 5, 202655 cities · 2.00″September 4, 202645 cities · 2.00″September 3, 2026115 cities · 2.00″September 2, 202622 cities · 2.00″September 1, 202645 cities · 2.00″August 31, 20264 cities · 2.00″

Every state with hail on record →

FAQ

US hail on September 18, 2023

NOAA radar put hail of an inch or more over 1 city across 1 state on September 18, 2023. The largest stones — 1.00 inches, quarter size — were over Sioux City, IA. 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