Hail size 1"
2 S Millston Monroe County
“(ARX)”
— NOAA / SPC storm report
/ Storm field report · Jackson
Hail in Black River Falls · Apr 13, 2026
NEXRAD logged 1 hail signature up to 1.75"; the estimated-size surface reached 1.25" aloft. Open it on the live map to see the swath over the streets.
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Peak hail signal 1.75" ≈ golf ball · the largest NEXRAD radar signature
Homes in the hail footprint 30
Ground reports 1 1 hail
Radar surfaces 2 NEXRAD + estimated size
Convective day · Apr 13, 2026 · noon–noon UTC
Severity
The 5th most severe storm Black River Falls 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
- 44 /100
- Homes exposed
- 30 /100
- Ground truth
- 17 /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 Black River Falls saw the hail — from two instruments
Apr 13, 2026 · Black River Falls, 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
1.75"
Detections
1
Radar-estimated hail size Surface resolved
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.
Max size
1.25"
The storm in context
Where Apr 13, 2026 sits in Black River Falls's hail record.
This was Black River Falls's 2nd recorded hail day, arriving 14 days after the Mar 30, 2026 storm. By severity it ranks 5th of the 12 storms we have logged here. Radar put the day's largest stone over Black River Falls at 1.75" — the largest NEXRAD radar signature.
The Apr 13, 2026 convective day was bigger than Black River Falls: the same system put hail over 467 other tracked cities, 108 of them in Wisconsin. Nearest: Merrillan (11 miles north, up to 1"); Alma Center (13 miles northwest, up to 3"); Pittsville (16 miles northeast, up to 1.5").
These maps are stills. In the app this date is one of 12 Black River Falls 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
1 report 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.
Hail reports
1 reportStorm forensics
How the storm moved
Timing and place names from NOAA ground reports
Read from the arrival times and locations of the NOAA ground reports, not a radar-measured storm track.
Reports came from Millston — beyond Black River Falls itself.
High damage potential
What 1.75" hail means for Black River Falls roofs.
Hail around an inch and a half is capable of cracking shingles, stripping granules, and denting gutters, vents, and siding. Risk is usually greatest near the strongest radar signal, but property-level damage still requires an on-site inspection.
Radar reading · not confirmed damage
Roofing exposure
What this storm is worth to a roofer.
30 homes × $12,000 avg. claim
Potential roof exposure
$360K
Potential roof exposure — 30 homes × the ~$12,000 industry-average hail roof claim. Exposure, not confirmed damage.
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 $6 on top of the $150 plan.
Black River Falls hail history
Other storms in Black River Falls.
12 recorded storm days in Black River Falls, WI
Estimated-size surface Storm date Black River Falls / WI
Sep 1, 2026
0.75" Estimated 0.75"
No ground reports filed Open report →
Estimated-size surface Storm date Black River Falls / WI
Jul 1, 2026
0.5" Estimated 0.5"
No ground reports filed Open report →
Estimated-size surface Storm date Black River Falls / WI
Jun 30, 2026
1.75" Signatures 1.75" Estimated 0.75"
No ground reports filed Open report →
Estimated-size surface Storm date Black River Falls / WI
Jun 10, 2026
0.5" Estimated 0.5"
No ground reports filed Open report →
Estimated-size surface Storm date Black River Falls / WI
Jun 9, 2026
1" Estimated 1"
No ground reports filed Open report →
Estimated-size surface Storm date Black River Falls / WI
May 27, 2026
1" Signatures 1" Estimated 0.5"
2 ground reports Open report →
Estimated-size surface Storm date Black River Falls / WI
May 18, 2026
0.75" Signatures 0.75" Estimated 0.5"
No ground reports filed Open report →
Estimated-size surface Storm date Black River Falls / WI
May 17, 2026
1.75" Signatures 1.75" Estimated 0.5"
No ground reports filed Open report →
Estimated-size surface Storm date Black River Falls / WI
Apr 17, 2026
3" Signatures 3" Estimated 1.25"
2 ground reports Open report →
Estimated-size surface Storm date Black River Falls / WI
Apr 14, 2026
2" Estimated 2"
2 ground reports Open report →
Estimated-size surface Storm date Black River Falls / WI
Mar 30, 2026
1.75" Signatures 1.75" Estimated 0.75"
No ground reports filed 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 Sep 2, 2026.