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
/ Storm field report · Eau Claire
Hail in Osseo · Apr 17, 2026
NEXRAD logged 3 hail signatures up to 0.75"; the estimated-size surface had no signal that day. Open it on the live map to see the swath over the streets.
A tornado was also reported to the National Weather Service during this storm. The ground reports below show where it was filed.
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Peak hail signal 0.75" ≈ penny to nickel · the largest NEXRAD radar signature
Homes in the hail footprint 746
Ground reports 2 2 tornado
Radar surfaces 1 NEXRAD only
Convective day · Apr 17, 2026 · noon–noon UTC
Severity
The 3rd most severe storm Osseo has seen in the last 12 months
Composite score · 3.6 / 10
Storm severity score
Overview's storm severity score weighs hailstone size, homes in the footprint, and ground-truth reports.
3.6 /10
- Peak hail signal
- 19 /100
- Homes exposed
- 57 /100
- Ground truth
- 67 /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 Osseo saw the hail — from two instruments
Apr 17, 2026 · Osseo, WI
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
0.75"
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.
The storm in context
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: Hixton (15 miles south, up to 2"); Fairchild (15 miles east, up to 1.25"); Humbird (16 miles southeast, up to 1.75").
These maps are stills. In the app this date is one of 9 Osseo 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.
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
Near the severe threshold
What 0.75" hail means for Osseo roofs.
A signal this size sits near the National Weather Service severe threshold. Aging shingles and soft metals such as vents, flashing, and gutters may be more vulnerable; roof age, wind, and material condition all matter, and only an inspection can confirm damage.
Radar reading · not confirmed damage
Roofing exposure
What this storm is worth to a roofer.
746 homes × $12,000 avg. claim
Potential roof exposure
$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
Close just 0.5% of the 746 homes in this footprint at the average $15,000 roof job. Illustrative math, not a projection — your results depend on your outreach and how the market responds.
Claim window
April 2028
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.
Names and phones for every home in the footprint: at most $157 on top of the $150 plan.
Estimated-size surface Storm date Osseo / WI
Jun 19, 2026
1" Estimated 1"
4 ground reports Open report →
Estimated-size surface Storm date Osseo / WI
Jun 10, 2026
0.5" Estimated 0.5"
No ground reports filed Open report →
Estimated-size surface Storm date Osseo / WI
Jun 9, 2026
1" Estimated 1"
No ground reports filed Open report →
Estimated-size surface Storm date Osseo / WI
May 27, 2026
1" Signatures 1"
No ground reports filed Open report →
Estimated-size surface Storm date Osseo / WI
May 18, 2026
1" Signatures 1" Estimated 0.5"
No ground reports filed Open report →
Estimated-size surface Storm date Osseo / WI
May 17, 2026
1" Signatures 1"
No ground reports filed Open report →
NEXRAD surface Storm date Osseo / WI
Apr 23, 2026
0.75" Signatures 0.75"
No ground reports filed Open report →
Estimated-size surface Storm date Osseo / WI
Apr 13, 2026
3.25" Signatures 3.25" Estimated 2"
3 ground reports Open report →
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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 Aug 2, 2026.