Great Falls, MT

Hail map for Great Falls, MT — July 31, 2025

NOAA radar detected hail up to 1.00″ — quarter size — within 5 miles of Great Falls on July 31, 2025.

Hail swath map for Great Falls, MT on July 31, 2025 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
Reached the ground
50%
NOAA POSH probability
Measured on the ground
1.25″
1.0 mi away · Public

NOAA's Probability of Severe Hail peaked at 50% over Great Falls that day — moderate: severe hail likely reached the ground somewhere nearby. It is a separate model from the size estimate above: one asks how big the stones were in the storm, the other asks whether they made it down.

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

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This page covers Great Falls 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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Other towns hit on July 31, 2025

Hagerstown, MD1.50″Greeley, CO1.00″Reading, PA1.00″Missoula, MT1.00″Cheyenne, WY1.00″Lancaster, PA1.00″Plainfield, NJ1.00″Texarkana, TX1.00″Hot Springs, AR1.00″Butte, MT1.00″Laramie, WY1.00″Texarkana, AR1.00″
Every Montana city hit on July 31, 2025 →

Other hail dates for Great Falls

January 23, 20261.50″January 13, 20261.00″December 6, 20251.00″June 21, 20251.50″June 15, 20251.00″June 3, 20251.00″March 24, 20251.00″September 4, 20241.00″July 2, 20241.50″February 23, 20241.50″December 11, 20231.00″
Every storm over Great Falls →

What people on the ground measured in Great Falls, MT on July 31, 2025

2 reports filed with the National Weather Service. These are measured stones, not radar estimates, so they are the closest thing to proof that hail actually reached the ground.

  • 1.25″ half dollar size Public
    1 SSE Great Falls, MT · 1.0 mi away9:30 PM MDTCascade County
  • 1.00″ quarter size Public
    2 WNW Great Falls, MT · 1.9 mi away9:10 PM MDTCascade County

    Time of report estimated via radar.

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

Great Falls hail on July 31, 2025

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

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