Wind gust 71 mph
6 W Butte Boyd County
“Ambient Weather Station. (LBF)”
— NOAA / SPC storm report
/ Storm field report · Gregory
Hail in Bonesteel · Sep 7, 2026
Hit 5 days ago
The estimated-size surface reached 1.5" aloft; NEXRAD logged no point detections over Bonesteel that day. Open it on the live map to see the swath over the streets.
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Peak hail signal 1.5" ≈ ping-pong ball · radar-estimated size aloft
Homes in the hail footprint 445
Ground reports 2 2 wind
Radar surfaces 1 Estimated size only
Convective day · Sep 7, 2026 · noon–noon UTC
Severity
The 3rd most severe storm Bonesteel has seen in the last 12 months
Composite score · 4.1 / 10
Storm severity score
Overview's storm severity score weighs hailstone size, homes in the footprint, and ground-truth reports.
4.1 /10
- Peak hail signal
- 38 /100
- Homes exposed
- 53 /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 7, 2026 · Bonesteel, SD
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.
Radar-estimated hail size Surface resolved
Map image is still rendering for this surface.
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.
Max size
1.5"
Only the radar-estimated size surface resolved for Sep 7, 2026 — this storm produced no NEXRAD point detections over Bonesteel, so there is one map to show, not two.
The storm in context
Where Sep 7, 2026 sits in Bonesteel's hail record.
This was Bonesteel's 9th recorded hail day, arriving 6 days after the Sep 1, 2026 storm. By severity it ranks 3rd of the 9 storms we have logged here. Radar put the day's largest stone over Bonesteel at 1.5" — radar-estimated size aloft.
The Sep 7, 2026 convective day was bigger than Bonesteel: the same system put hail over 163 other tracked cities, 19 of them in South Dakota. Nearest: Fairfax (10 miles southeast, up to 1.5"); Butte (14 miles south, up to 2"); Herrick (14 miles southwest, up to 0.5").
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.
Wind reports
2 reports Wind gust 64 mph
6 W Butte Boyd County
“Ambient weather station. (LBF)”
— 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.
Reports came from Butte — beyond Bonesteel itself.
High damage potential
What 1.5" hail means for Bonesteel 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.
445 homes × $12,000 avg. claim
Potential roof exposure
$5.3M
Potential roof exposure — 445 homes × the ~$12,000 industry-average hail roof claim. Exposure, not confirmed damage.
- Illustrative jobs
- 2 jobs
- Illustrative work
- ~$30K
Close just 0.5% of the 445 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 $93 on top of the $150 plan.
Bonesteel hail history
Other storms in Bonesteel.
9 recorded storm days in Bonesteel, SD
Estimated-size surface Storm date Bonesteel / SD
Sep 1, 2026
2" Estimated 2"
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 →
Take your next area into the field.
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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.