Hail in Granite Falls · Aug 20, 2026
The estimated-size surface reached 0.75" aloft; NEXRAD logged no point detections over Granite Falls that day. Open it on the live map to see the swath over the streets.
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Convective day · Aug 20, 2026 · noon–noon UTC
Severity
The 5th most severe storm Granite Falls has seen in the last 12 months
Overview's storm severity score weighs hailstone size, homes in the footprint, and ground-truth reports.
- Peak hail signal
- 19 /100
- Homes exposed
- 43 /100
- Ground truth
- 0 /100
Largest radar-indicated size — a signal of damage potential, not confirmation.
How many homes sit inside the storm's footprint.
Independent storm reports filed with the NWS.
Evidence / storm surfaces
How Granite Falls saw the hail — from two instruments
We map this storm two ways: the NEXRAD radar signatures the storm produced overhead, and the radar-estimated size of the hail in the air. The two surfaces don’t have to match — where they diverge is where estimated size aloft ran ahead of, or behind, what the signatures caught.
Estimated size field Maximum hail size as estimated from radar aloft. Treat it as the storm's ceiling — the largest supportable stone — rather than a ground measurement.
Only the radar-estimated size surface resolved for Aug 20, 2026 — this storm produced no NEXRAD point detections over Granite Falls, so there is one map to show, not two.
The storm in context
Where Aug 20, 2026 sits in Granite Falls's hail record.
This was Granite Falls's 5th recorded hail day, arriving 13 days after the Aug 7, 2026 storm. By severity it ranks 5th of the 5 storms we have logged here. Radar put the day's largest stone over Granite Falls at 0.75" — radar-estimated size aloft.
The Aug 20, 2026 convective day was bigger than Granite Falls: the same system put hail over 640 other tracked cities, 43 of them in Minnesota. Nearest: Hanley Falls (8 miles southeast, up to 1.75"); Wood Lake (12 miles southeast, up to 1.75"); Echo (18 miles southeast, up to 1.25").
These maps are stills. In the app this date is one of 5 Granite Falls storm dates on a live map — both surfaces, the reports, and a replay — and the same map is where you draw the swath. This page rebuilds nightly.
Ground reports
What people on the ground reported
These are storm reports filed with the National Weather Service and released through the NOAA Storm Prediction Center — public-domain observations from spotters, the public, and NWS surveys. We quote each one exactly as filed.
For this storm over Granite Falls, the NWS report log is empty — a common outcome, since ground reports only happen when someone witnesses the hail and takes the time to call it in. The detection record for the date lives in the radar maps above.
Near the severe threshold
What 0.75" hail means for Granite Falls roofs.
A signal this size sits near the National Weather Service severe threshold. Aging shingles and soft metals such as vents, flashing, and gutters may be more vulnerable; roof age, wind, and material condition all matter, and only an inspection can confirm damage.
Radar reading · not confirmed damage
Roofing exposure
What this storm is worth to a roofer.
Potential roof exposure
$1.7M
Potential roof exposure — 142 homes × the ~$12,000 industry-average hail roof claim. Exposure, not confirmed damage.
- Illustrative jobs
- 1 job
- Illustrative work
- ~$15K
Close just 0.5% of the 142 homes in this footprint at the average $15,000 roof job. Illustrative math, not a projection — your results depend on your outreach and how the market responds.
Claim window
August 2028
Claims from this storm can typically be filed until around August 2028 — the window to reach these homeowners while it's still open. Deadlines vary by policy and state.
Names and phones for every home in the footprint: at most $30 on top of the $150 plan.
Granite Falls hail history
Other storms in Granite Falls.
Estimated-size surface Aug 7, 2026
1"
Estimated-size surface Aug 6, 2026
1"
Estimated-size surface Jul 7, 2026
1.25"
Estimated-size surface Jul 4, 2026
1"Take your next area into the field.
See the hail, review your recommendations, and canvass with Overview on iPhone.
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