How big was the hail on August 1, 2023?

The maximum estimated stone size anywhere in the country that day was 1.50 inches, over Williston, ND. 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 · August 1, 2023

Hail map — August 1, 2023

Name: US hail map — August 1, 2023
Creator: HailMate

NOAA radar detected hail of an inch or more over 4 cities across 2 states on August 1, 2023. The largest stones — 1.50″, half dollar size — fell over Williston, ND.

Hail swath map for Williston, ND on August 1, 2023 showing 1.50 inch hail. — Largest rendered swath of the day: Williston, ND — 1.50″ hail. Each city below has its own map for this storm.

States hit: 2
Cities hit: 4
Largest stone: 1.50″; half dollar size
Impact rating: 5/10; 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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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 August 1, 2023

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

North Dakota3 cities · 1.50″Missouri1 city · 1.00″

Hardest hit on August 1, 2023

Williston, ND1.50″ · half dollar Mandan, ND1.50″ · half dollar Bismarck, ND1.00″ · quarter Sedalia, MO1.00″ · quarter

What people on the ground measured in the US on August 1, 2023

15 reports filed with the National Weather Service — 2 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.

2.00″ hen egg size Broadcast Media
6 E Goodridge, MN4:36 PM CDTPennington County
Delayed report from social media. Golf ball to egg size hail.
1.75″ golf ball size Emergency Mngr
New Town, ND6:20 PM CDTMountrail County
Heavy Rain, Wind gusts 30 to 40 mph.
1.75″ golf ball size Public
Watford City, ND6:37 PM CDTMcKenzie County
delayed report from august 1. time estimated from radar. report of golf ball sized hail.
1.75″ golf ball size Trained Spotter
6 S Raub, ND7:11 PM CDTMcLean County
Heavy Rain with Winds estimated 50 to 60 mph.
1.75″ golf ball size Public
1 S Harrington, SD8:30 PM CDTBennett County
Very heavy rain as well. Estimated up to 2 inches of rain so far and still raining.
1.75″ golf ball size Public
4 WNW Stanton, ND8:45 PM CDTMercer County
Golf ball size hail reported from social media, lasted 5-7 minutes. 1.30 inches of rain.
1.50″ half dollar size Public
Epping, ND5:02 PM CDTWilliams County
Heavy Rain with estimated winds of 30 to 40 mph.
1.50″ half dollar size Public
2 E New Town, ND6:24 PM CDTMountrail County
Hail report from social media.
1.50″ half dollar size Public
9 SSW Parshall, ND6:47 PM CDTMcLean County
Report from mPING.
1.50″ half dollar size Public
1 SE Manning, ND8:04 PM CDTDunn County
delayed report from august 1. relayed through social media. averaged nickel to quarter size but largest was ping pong ball size. time estimated from radar.
1.50″ half dollar size Broadcast Media
Hazen, ND8:31 PM CDTMercer County
Relayed through broadcast media of hail covering the ground north of Hazen. Largest size was pictured around ping pong ball sized. Time estimated based on radar.
1.25″ half dollar size Public
1 SSE Pine Grove, CO2:50 PM MDTJefferson County
Corrects previous hail report from 1 SSE Pine Grove.
1.25″ half dollar size Public
1 SSE Pine Grove, CO3:50 PM MDTJefferson County
1.25″ half dollar size Storm Chaser
5 SW Last Chance, CO4:19 PM MDTWashington County
1.25″ half dollar size Broadcast Media
Twin Buttes, ND7:18 PM CDTDunn County
Picture relayed through broadcast media of hail bigger than a quarter in Twin Buttes. Time estimated based on radar.

Showing the 15 largest of 43 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 August 1, 2023

NOAA radar put hail of an inch or more over 4 cities across 2 states on August 1, 2023. The largest stones — 1.50 inches, half dollar size — were over Williston, ND. Every state hit is listed on this page, and every city under it.

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