Hail in Grand River · Apr 23, 2026
NEXRAD logged 0 hail signatures up to 0"; the estimated-size surface reached 0" aloft. Open it on the live map to see the swath over the streets.
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Convective day · Apr 23, 2026 · noon–noon UTC
Severity
The 8th most severe storm Grand River 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
- 0 /100
- Homes exposed
- 0 /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 Grand River 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.
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.
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.
The storm in context
Where Apr 23, 2026 sits in Grand River's hail record.
This was Grand River's 4th recorded hail day, arriving 8 days after the Apr 15, 2026 storm. By severity it ranks 8th of the 8 storms we have logged here. Radar put the day's largest stone over Grand River at 0" — radar-estimated size aloft.
The Apr 23, 2026 convective day was bigger than Grand River: the same system put hail over 703 other tracked cities, 252 of them in Iowa. Nearest: Afton (9 miles northwest, up to 1"); Weldon (10 miles east, up to 1"); Osceola (10 miles northeast, up to 1").
These maps are stills. In the app this date is one of 8 Grand River 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.
The National Weather Service logged no spotter reports for this storm over Grand River. That absence is ordinary — filing a report takes a person on the spot who saw the hail and phoned it in. What stands as the record for this date is the radar above, which caught the storm regardless.
Below the severe threshold
What 0" hail means for Grand River 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
Grand River hail history
Other storms in Grand River.
Estimated-size surface Aug 4, 2026
0.5"
Estimated-size surface Jun 11, 2026
2.75"
Estimated-size surface Jun 10, 2026
0.75"
Estimated-size surface May 18, 2026
0.5"
Estimated-size surface Apr 15, 2026
1"
Estimated-size surface Apr 3, 2026
1"
Estimated-size surface Mar 5, 2026
1"The next storm won’t wait for you.
Set your territory and alerts today. When hail hits, use Overview to choose your streets and get moving.
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Web trial: 7 days free. Card required. $150/month after the trial unless cancelled.