Hail in Spring Green · Aug 21, 2026
The estimated-size surface reached 0.5" aloft; NEXRAD logged no point detections over Spring Green that day. Open it on the live map to see the swath over the streets.
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Convective day · Aug 21, 2026 · noon–noon UTC
Severity
The 3rd most severe storm Spring Green 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
- 13 /100
- Homes exposed
- 26 /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 Spring Green 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 21, 2026 — this storm produced no NEXRAD point detections over Spring Green, so there is one map to show, not two.
The storm in context
Where Aug 21, 2026 sits in Spring Green's hail record.
This was Spring Green's 4th recorded hail day, arriving 10 days after the Aug 11, 2026 storm. By severity it ranks 3rd of the 4 storms we have logged here. Radar put the day's largest stone over Spring Green at 0.5" — radar-estimated size aloft.
The Aug 21, 2026 convective day was bigger than Spring Green: the same system put hail over 659 other tracked cities, 19 of them in Wisconsin. Nearest: Plain (9 miles northwest, up to 0.5"); Avoca (15 miles west, up to 0.5"); Cazenovia (17 miles northwest, up to 0.75").
These maps are stills. In the app this date is one of 4 Spring Green 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 Spring Green, 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.
Below the severe threshold
What 0.5" hail means for Spring Green 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.
Potential roof exposure
$216K
Potential roof exposure — 18 homes × the ~$12,000 industry-average hail roof claim. Exposure, not confirmed damage.
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 $4 on top of the $150 plan.
Spring Green hail history
Other storms in Spring Green.
Estimated-size surface Aug 11, 2026
0.5"
Estimated-size surface May 15, 2026
Estimated-size surface Apr 14, 2026
1.25"Take your next area into the field.
See the hail, review your recommendations, and canvass with Overview on iPhone.
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