Hail in White River · Aug 18, 2026
NEXRAD logged 0 hail signatures up to 0"; 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 · Aug 18, 2026 · noon–noon UTC
Severity
The 13th most severe storm White River 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
- 13 /100
- Homes exposed
- 6 /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 White River saw the hail — from two instruments
The maps here read the same storm from two angles — point detections from NEXRAD, and modeled hail size aloft. Where the two disagree is informative: it marks where estimated size outran the signatures, or trailed them.
Radar signature field Where NEXRAD flagged hail as the storm passed — point signatures from the radar, which indicate hail overhead rather than confirm what landed.
Estimated size field The modeled maximum hail size across the swath, derived from radar aloft — the largest stone the storm could have supported, which is not necessarily what reached the ground.
The storm in context
Where Aug 18, 2026 sits in White River's hail record.
This was White River's 11th recorded hail day, arriving 7 days after the Aug 11, 2026 storm. By severity it ranks 13th of the 13 storms we have logged here. Radar put the day's largest stone over White River at 0.5" — radar-estimated size aloft.
The Aug 18, 2026 convective day was bigger than White River: the same system put hail over 309 other tracked cities, 8 of them in South Dakota. Nearest: Wood (17 miles southeast, up to 0.75"); Winner (62 miles east, up to 1.25"); Springview (71 miles southeast, up to 1").
These maps are stills. In the app this date is one of 13 White River 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.
The National Weather Service logged no spotter reports for this storm over White River. That absence is ordinary — filing a report takes a person on the spot who saw the hail and phoned it in. What stands as the record for this date is the radar above, which caught the storm regardless.
Below the severe threshold
What 0.5" hail means for White River roofs.
Radar signals under three-quarters of an inch stay below the National Weather Service severe threshold and generally indicate lower roof risk. Older or already-worn materials can still show effects, but radar alone cannot determine whether a specific roof was damaged.
Radar reading · not confirmed damage
Roofing exposure
What this storm is worth to a roofer.
Potential roof exposure
$12K
Potential roof exposure — 1 homes × the ~$12,000 industry-average hail roof claim. Exposure, not confirmed damage.
Claim window
August 2028
Claims from this storm can typically be filed until around August 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 $0 on top of the $150 plan.
White River hail history
Other storms in White River.
Estimated-size surface Aug 27, 2026
1.25"
Estimated-size surface Aug 24, 2026
1.5"
Estimated-size surface Aug 11, 2026
1.75"
Estimated-size surface Jul 30, 2026
1.5"
Estimated-size surface Jul 29, 2026
1"
Estimated-size surface Jul 25, 2026
1.25"
Estimated-size surface Jul 3, 2026
1.25"
Estimated-size surface Jul 2, 2026
1.75"
Estimated-size surface Jun 28, 2026
4"
Estimated-size surface Jun 20, 2026
0.5"
Estimated-size surface Jun 4, 2026
1"
Estimated-size surface Jun 2, 2026
2.5"Take your next area into the field.
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