Tornado Rating unknown
1 W Osseo Trempealeau County
“Numerous houses and trees damaged along County Rd K and Old 17. (ARX)”
— NOAA / SPC storm report
Hail in Osseo Apr 17, 2026
NEXRAD caught this storm: 3 hail signatures up to 0.75". The radar-estimated size surface had no signal to model this day.
A tornado was also reported to the National Weather Service during this storm — see the ground reports below.
Largest hailstone
0.75"
≈ penny to nickel · the largest NEXRAD radar signature Homes in the hail footprint
746
Ground reports
2
2 tornadoThe 3rd most severe storm Osseo 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.
3.6 /10
- Hail size
- 19 /100
- Homes exposed
- 57 /100
- Ground truth
- 67 /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 Osseo 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.
NEXRAD radar signatures
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
0.75"
Detections
3
Only the NEXRAD radar-signature surface resolved for Apr 17, 2026 — the estimated-size swath had no hail signal to model for this storm, so there is one map to show, not two.
Where Apr 17, 2026 sits in Osseo's hail record
This was Osseo's 2nd recorded hail day, arriving 4 days after the Apr 13, 2026 storm. By severity it ranks 3rd of the 9 storms we have logged here. Radar put the day's largest stone over Osseo at 0.75" — the largest NEXRAD radar signature.
The Apr 17, 2026 convective day was bigger than Osseo: the same system put hail over 1,016 other tracked cities, 178 of them in Wisconsin. Nearest: Alma Center (12 miles southeast, up to 2"); Fairchild (15 miles east, up to 1.25"); Humbird (16 miles southeast, up to 1.75").
These maps are stills from Osseo's Apr 17, 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.
Tornado reports
2 reports Tornado Rating unknown
3 SE Osseo Trempealeau County
“This EF1-rated tornado touched down near Interstate 94 where County Road B nearly intersects about 3 miles southeast of Osseo WI. The tornado affected rural areas causi (ARX)”
— NOAA / SPC storm report
What 0.75" hail means for Osseo roofs
Hail this size sits right at the edge of the National Weather Service severe threshold. Newer roofs usually shrug it off, but aging or already-worn shingles can bruise, and soft metals — vents, flashing, gutters — often show the first dents.
What this storm is worth to a roofer
$9M
Potential roof exposure — 746 homes × the ~$12,000 industry-average hail roof claim. Exposure, not confirmed damage.
Illustrative jobs
4 jobs
Illustrative work
~$60K
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 Osseo on the live map
Radar updates in real time, spotter reports appear on the map as they're filed, and the full Osseo storm history — this Apr 17, 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
Osseo hail history
← All hail in Osseo 9 recorded storm days in Osseo, WI
Other storms in Osseo
Jun 19, 2026
1" Estimated 1"
4
ground reports 
Jun 10, 2026
0.5" Estimated 0.5"
No ground reports filed 
Jun 9, 2026
1" Estimated 1"
No ground reports filed 
May 27, 2026
1" Signatures 1"
No ground reports filed 
May 18, 2026
1" Signatures 1" Estimated 0.5"
No ground reports filed 
May 17, 2026
1" Signatures 1"
No ground reports filed 
Apr 23, 2026
0.75" Signatures 0.75"
No ground reports filed 
Apr 13, 2026
3.25" Signatures 3.25" Estimated 2"
3
ground reports
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 2, 2026.