Hail size 1"
3 ESE Naper Boyd County
“Estimated quarter size hail. (LBF)”
— NOAA / SPC storm report
/ Storm field report · Gregory
Hail in Bonesteel · Sep 1, 2026
Hit 11 days ago
NEXRAD logged 0 hail signatures up to 0"; the estimated-size surface reached 2" aloft. At 2" — tennis ball — this is a severe hail signal associated with roof damage. Open it on the live map to see the swath over the streets.
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Peak hail signal 2" ≈ tennis ball · radar-estimated size aloft
Homes in the hail footprint 1,435
Ground reports 2 2 hail
Radar surfaces 2 NEXRAD + estimated size
Convective day · Sep 1, 2026 · noon–noon UTC
Severity
The most severe storm Bonesteel has seen in the last 12 months
Composite score · 5.1 / 10
Storm severity score
Overview's storm severity score weighs hailstone size, homes in the footprint, and ground-truth reports.
5.1 /10
- Peak hail signal
- 50 /100
- Homes exposed
- 63 /100
- Ground truth
- 33 /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 Bonesteel saw the hail — from two instruments
Sep 1, 2026 · Bonesteel, SD
Each storm gets two readings: the radar signatures NEXRAD recorded as the cells passed overhead, and a modeled estimate of hail size in the air. They are independent surfaces, so a mismatch between them is expected — and worth reading.
NEXRAD radar signatures Surface resolved
Radar signature field The point detections NEXRAD recorded overhead. Each signature marks where the radar saw hail aloft — it is a detection, not a stone measured on the ground.
Max size
0"
Detections
0
Radar-estimated hail size Surface resolved
Estimated size field Radar-estimated hail size over the swath. The model reports the biggest stone the storm could sustain in the air; what actually fell may have been smaller.
Max size
2"
The storm in context
Where Sep 1, 2026 sits in Bonesteel's hail record.
This was Bonesteel's 8th recorded hail day, arriving 9 days after the Aug 23, 2026 storm. By severity it ranks 1st of the 9 storms we have logged here. Radar put the day's largest stone over Bonesteel at 2" — radar-estimated size aloft.
The Sep 1, 2026 convective day was bigger than Bonesteel: the same system put hail over 362 other tracked cities, 42 of them in South Dakota. Nearest: Fairfax (10 miles southeast, up to 2.75"); Butte (14 miles south, up to 2.5"); Herrick (14 miles southwest, up to 1.5").
These maps are stills. In the app this date is one of 9 Bonesteel 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.
Hail reports
2 reports Hail size 1"
Fairfax Gregory County
“Heavy rainfall accompanied mostly dime sized hail... but a few stones were as big as a quarter. (FSD)”
— NOAA / SPC storm report
Storm 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.
Hail was reported over 25 minutes, from to .
Reports came from Naper and Fairfax — beyond Bonesteel itself.
Severe hail signal
What 2" hail means for Bonesteel roofs.
Two-inch-plus hail is capable of puncturing shingles, breaking skylights or windows, and heavily denting soft materials. The strongest radar bands warrant prompt inspection, but neither the signal nor the footprint confirms damage at a specific address.
Radar reading · not confirmed damage
Roofing exposure
What this storm is worth to a roofer.
1,435 homes × $12,000 avg. claim
Potential roof exposure
$17M
Potential roof exposure — 1,435 homes × the ~$12,000 industry-average hail roof claim. Exposure, not confirmed damage.
- Illustrative jobs
- 7 jobs
- Illustrative work
- ~$105K
Close just 0.5% of the 1,435 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
September 2028
Claims from this storm can typically be filed until around September 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 $301 on top of the $150 plan.
Bonesteel hail history
Other storms in Bonesteel.
9 recorded storm days in Bonesteel, SD
Map unavailable
NEXRAD surface Storm date Bonesteel / SD
Sep 7, 2026
1.5" Estimated 1.5"
2 ground reports Open report →
Estimated-size surface Storm date Bonesteel / SD
Aug 23, 2026
1.5" Estimated 1.5"
No ground reports filed Open report →
Estimated-size surface Storm date Bonesteel / SD
Aug 6, 2026
0.75" Estimated 0.75"
No ground reports filed Open report →
Estimated-size surface Storm date Bonesteel / SD
Aug 3, 2026
1" Estimated 1"
No ground reports filed Open report →
Estimated-size surface Storm date Bonesteel / SD
Jul 2, 2026
1.75" Signatures 1.75" Estimated 1"
No ground reports filed Open report →
Estimated-size surface Storm date Bonesteel / SD
Jun 30, 2026
1.75" Signatures 1.75" Estimated 1"
1 ground report Open report →
Estimated-size surface Storm date Bonesteel / SD
Jun 27, 2026
1" Signatures 1" Estimated 0.75"
No ground reports filed Open report →
Estimated-size surface Storm date Bonesteel / SD
Jun 3, 2026
0.75" Signatures 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 8, 2026.