Both radar surfaces caught this storm: NEXRAD logged 0 hail signatures up to 1", and the radar-estimated size reached 0.5" aloft.
A tornado was also reported to the National Weather Service during this storm — see the ground reports below.
1"
≈ quarter · the largest NEXRAD radar signature187
2
1 wind · 1 tornadoOverview's storm severity score weighs hailstone size, homes in the footprint, and ground-truth reports.
Largest hailstone — the top predictor of roof damage.
How many homes sit inside the storm's footprint.
Independent storm reports filed with the NWS.
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.
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.
This was Walthill's 1st recorded hail day — the first hail day in our records for the city. By severity it ranks 2nd of the 6 storms we have logged here. Radar put the day's largest stone over Walthill at 1" — the largest NEXRAD radar signature.
The May 17, 2026 convective day was bigger than Walthill: the same system put hail over 894 other tracked cities, 185 of them in Nebraska. Nearest: Pender (5 miles west, up to 1"); Macy (5 miles east, up to 1"); Lyons (7 miles south, up to 1").
These maps are stills from Walthill's May 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.
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.
“An EF-1 tornado touched down west of Highway 77 and tracked northeast damaging trees and the roofs of homes. The tornado impacted locations near baseball fields on the (OAX)”
— NOAA / SPC storm report
“Personal Weather Station. (OAX)”
— NOAA / SPC storm report
Hail was reported over 11 minutes, from to .
Reports came from Winnebago — beyond Walthill itself.
Quarter-size and larger hail is where asphalt shingle damage starts in earnest: bruised mats and granule loss that homeowners can't see from the ground. Most people inside the footprint won't know their roof was hit until someone inspects it.
$2.2M
Potential roof exposure — 187 homes × the ~$12,000 industry-average hail roof claim. Exposure, not confirmed damage.Radar updates in real time, spotter reports appear on the map as they're filed, and the full Walthill storm history — this May 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
6 recorded storm days in Walthill, NE
Jul 26, 2026
0.5"
Jul 8, 2026
1.75"
Jul 1, 2026
1"
Jun 13, 2026
0.75"
May 18, 2026
1"