Hail size 1"
1 WNW Green Bay Brown County
“(GRB)”
— NOAA / SPC storm report
Hail in Green Bay Apr 13, 2026
The radar-estimated size surface caught this storm, reaching 0.5" aloft. NEXRAD logged no point detections over Green Bay this day.
Largest hailstone
0.5"
≈ pea to penny · radar-estimated size aloft Homes in the hail footprint
10,977
Ground reports
3
3 hailThe 3rd most severe storm Green Bay has seen in the last 12 months
Storm severity score
Overview's storm severity score weighs hailstone size, homes in the footprint, and ground-truth reports.
3.5 /10
- Hail size
- 13 /100
- Homes exposed
- 81 /100
- Ground truth
- 50 /100
Largest hailstone — the top predictor of roof damage.
How many homes sit inside the storm's footprint.
Independent storm reports filed with the NWS.
How Green Bay 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-estimated hail size
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"
Only the radar-estimated size surface resolved for Apr 13, 2026 — this storm produced no NEXRAD point detections over Green Bay, so there is one map to show, not two.
Where Apr 13, 2026 sits in Green Bay's hail record
This was Green Bay's 2nd recorded hail day, arriving 14 days after the Mar 30, 2026 storm. By severity it ranks 3rd of the 6 storms we have logged here. Radar put the day's largest stone over Green Bay at 0.5" — radar-estimated size aloft.
The Apr 13, 2026 convective day was bigger than Green Bay: the same system put hail over 467 other tracked cities, 108 of them in Wisconsin. Nearest: De Pere (8 miles southwest, up to 0.5"); Denmark (12 miles southeast, up to 0.75"); New Franken (12 miles northeast, up to 0.5").
These maps are stills from Green Bay's Apr 13, 2026 storm. In the Overview app the same surfaces are live — radar updating in real time, radar-estimated hail size as it forms, and NWS spotter reports pinned where they're filed — with a radar replay you can scrub back over any past day.
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.
Hail reports
3 reports Hail size 1.25"
2 WNW Green Bay Brown County
“Quarter sized to half dollar sized hail. Corner of Allard Ave. and Camm Place. (GRB)”
— NOAA / SPC storm report
Hail size 1"
2 N Ashwaubenon Brown County
“Report from mPING: Quarter (1.00 in.). (GRB)”
— NOAA / SPC storm report
Storm forensics
Read from the arrival times and locations of the NOAA ground reports,
not a radar-measured storm track.
How the storm moved
Reports came from Ashwaubenon — beyond Green Bay itself.
What 0.5" hail means for Green Bay roofs
Hail under three-quarters of an inch stays below the National Weather Service severe threshold and rarely breaks shingles outright. But repeated small-hail events accelerate granule loss and shorten roof life — on older roofs, it's still worth a conversation.
What this storm is worth to a roofer
$132M
Potential roof exposure — 10,977 homes × the ~$12,000 industry-average hail roof claim. Exposure, not confirmed damage.
Illustrative jobs
55 jobs
Illustrative work
~$825K
Claims from this storm can typically be filed until around April 2028 — the window to reach these homeowners while it's still open. Deadlines vary by policy and state.
Track hail over Green Bay on the live map
Radar updates in real time, spotter reports appear on the map as they're filed, and the full Green Bay storm history — this Apr 13, 2026 storm included — sits underneath. When you're ready, draw this storm's footprint and pull highly accurate homeowner contact information for every address inside it.
Highly accurate contact information starting at $0.23 per address — every contact included. Digital leads cost $15–$40. Start with a 7-day free trial — no credit card required. See pricing
Green Bay hail history
← All hail in Green Bay 6 recorded storm days in Green Bay, WI
Other storms in Green Bay
Jul 1, 2026
1" Signatures 1" Estimated 0.5"
No ground reports filed 
Jun 30, 2026
1.25" Signatures 1.25" Estimated 0.75"
1
ground report 
Jun 24, 2026
0.75" Estimated 0.75"
4
ground reports 
Apr 14, 2026
0.5" Estimated 0.5"
No ground reports filed 
Mar 30, 2026
1" Signatures 1"
1
ground report
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 surfaces are detections and estimates,
not confirmed damage. Last updated Aug 3, 2026.