Wind gust 75 mph
6 SW Warren Polk County
“NDAWN 3 meter wind gust. (FGF)”
— NOAA / SPC storm report
/ Storm field report · Polk
Hail in East Grand Forks · Sep 3, 2026
Hit 9 days ago
NEXRAD logged 0 hail signatures up to 0"; the estimated-size surface reached 0.5" aloft. Open it on the live map to see the swath over the streets.
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Peak hail signal 0.5" ≈ pea to penny · radar-estimated size aloft
Homes in the hail footprint 49
Ground reports 2 2 wind
Radar surfaces 2 NEXRAD + estimated size
Convective day · Sep 3, 2026 · noon–noon UTC
Severity
The 3rd most severe storm East Grand Forks has seen in the last 12 months
Composite score · 2.1 / 10
Storm severity score
Overview's storm severity score weighs hailstone size, homes in the footprint, and ground-truth reports.
2.1 /10
- Peak hail signal
- 13 /100
- Homes exposed
- 34 /100
- Ground truth
- 33 /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 East Grand Forks saw the hail — from two instruments
Sep 3, 2026 · East Grand Forks, MN
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.
NEXRAD radar signatures Surface resolved
Radar signature field NEXRAD radar signatures — the point detections the storm produced overhead. A signature is where the radar saw hail, not a confirmed stone on the ground.
Max size
0"
Detections
0
Radar-estimated hail size Surface resolved
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.
Max size
0.5"
The storm in context
Where Sep 3, 2026 sits in East Grand Forks's hail record.
This was East Grand Forks's 6th recorded hail day, arriving 32 days after the Aug 2, 2026 storm. By severity it ranks 3rd of the 7 storms we have logged here. Radar put the day's largest stone over East Grand Forks at 0.5" — radar-estimated size aloft.
The Sep 3, 2026 convective day was bigger than East Grand Forks: the same system put hail over 494 other tracked cities, 73 of them in Minnesota. Nearest: Alvarado (7 miles north, up to 0.75"); Oslo (8 miles northwest, up to 0.5"); Warren (12 miles northeast, up to 0.75").
These maps are stills. In the app this date is one of 7 East Grand Forks 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
2 reports filed with the NWS
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.
Wind reports
2 reports Wind gust 61 mph
5 WNW Tabor Polk County
“Personal weather station recorded sustained 45 mph gusting 61 mph. (FGF)”
— NOAA / SPC storm report
Storm forensics
How the storm moved
Timing and place names from NOAA ground reports
Read from the arrival times and locations of the NOAA ground reports, not a radar-measured storm track.
Reports came from Warren and Tabor — beyond East Grand Forks itself.
Below the severe threshold
What 0.5" hail means for East Grand Forks roofs.
Radar signals under three-quarters of an inch stay below the National Weather Service severe threshold and generally indicate lower roof risk. Older or already-worn materials can still show effects, but radar alone cannot determine whether a specific roof was damaged.
Radar reading · not confirmed damage
Roofing exposure
What this storm is worth to a roofer.
49 homes × $12,000 avg. claim
Potential roof exposure
$588K
Potential roof exposure — 49 homes × the ~$12,000 industry-average hail roof claim. Exposure, not confirmed damage.
Claim window
September 2028
Claims from this storm can typically be filed until around September 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 $10 on top of the $150 plan.
East Grand Forks hail history
Other storms in East Grand Forks.
7 recorded storm days in East Grand Forks, MN
Estimated-size surface Storm date East Grand Forks / MN
Sep 6, 2026
0.5" Estimated 0.5"
No ground reports filed Open report →
Estimated-size surface Storm date East Grand Forks / MN
Aug 2, 2026
1" Estimated 1"
No ground reports filed Open report →
Estimated-size surface Storm date East Grand Forks / MN
Jun 29, 2026
1" Signatures 1" Estimated 0.75"
No ground reports filed Open report →
Estimated-size surface Storm date East Grand Forks / MN
Jun 10, 2026
0.5" Estimated 0.5"
No ground reports filed Open report →
Estimated-size surface Storm date East Grand Forks / MN
Jun 3, 2026
1" Signatures 1" Estimated 0.5"
No ground reports filed Open report →
Estimated-size surface Storm date East Grand Forks / MN
Apr 12, 2026
1" Signatures 1" Estimated 0.5"
No ground reports filed Open report →
Take your next area into the field.
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A storm day here is a convective day — it runs from noon to noon
UTC, so late-night hail is grouped with the afternoon storm that
spawned it rather than split across two calendar dates. Ground
reports are public-domain observations from the NOAA Storm
Prediction Center. Radar tells you where to look. Only an inspection confirms damage at an address. Last updated Sep 7, 2026.