Hail in Black River Falls · May 18, 2026
NEXRAD logged 4 hail signatures up to 0.75"; the estimated-size surface reached 0.5" aloft. Open it on the live map to see the swath over the streets.
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Convective day · May 18, 2026 · noon–noon UTC
Severity
The 12th most severe storm Black River Falls 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
- 19 /100
- Homes exposed
- 0 /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 Black River Falls saw the hail — from two instruments
Two instruments, one storm: NEXRAD logs the point signatures it detected overhead, while the estimated-size surface models how large the hail aloft could have grown. Agreement between them is not guaranteed — the gaps are where the model ran ahead of, or behind, the detections.
NEXRAD's hail signatures for this storm: the spots the radar detected from above. A detection overhead is not the same thing as a confirmed stone below.
Estimated size field Radar-estimated maximum hail size across the swath, modeled from radar aloft. It reflects the biggest stone the storm could support, which may differ from what actually fell.
The storm in context
Where May 18, 2026 sits in Black River Falls's hail record.
This was Black River Falls's 6th recorded hail day, arriving 1 day after the May 17, 2026 storm. By severity it ranks 12th of the 12 storms we have logged here. Radar put the day's largest stone over Black River Falls at 0.75" — the largest NEXRAD radar signature.
The May 18, 2026 convective day was bigger than Black River Falls: the same system put hail over 726 other tracked cities, 5 of them in Wisconsin. Nearest: Alma Center (13 miles northwest, up to 1.5"); Osseo (33 miles northwest, up to 1"); Westby (38 miles south, up to 0.5").
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
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.
No ground reports were filed with the National Weather Service for this storm over Black River Falls. That is common: a report depends on someone being there to see it and take the time to call it in. The radar surfaces above are the record here — the storm was detected from above even though no one on the ground logged it.
Near the severe threshold
What 0.75" hail means for Black River Falls 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
Black River Falls hail history
Other storms in Black River Falls.
Estimated-size surface Sep 1, 2026
0.75"
Estimated-size surface Jul 1, 2026
0.5"
Estimated-size surface Jun 30, 2026
1.75"
Estimated-size surface Jun 10, 2026
0.5"
Estimated-size surface Jun 9, 2026
1"
Estimated-size surface May 27, 2026
1"
Estimated-size surface May 17, 2026
1.75"
Estimated-size surface Apr 17, 2026
3"
Estimated-size surface Apr 14, 2026
2"
Estimated-size surface Apr 13, 2026
1.75"
Estimated-size surface Mar 30, 2026
1.75"The next storm won’t wait for you.
Set your territory and alerts today. When hail hits, use Overview to choose your streets and get moving.
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