Hail size 3"
13 E Buffalo Gap Custer County
“Reported via Spotter Network along Riverside Rd. Time adjusted based on radar. (UNR)”
— NOAA / SPC storm report
/ Storm field report · Pennington
Hail in Hermosa · Aug 11, 2026
Hit 32 days ago
NEXRAD logged 0 hail signatures up to 0"; the estimated-size surface reached 4" aloft. At 4" — softball or larger — 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 4" ≈ softball or larger · radar-estimated size aloft
Homes in the hail footprint 3,519
Ground reports 23 22 hail · 1 wind
Radar surfaces 2 NEXRAD + estimated size
Convective day · Aug 11, 2026 · noon–noon UTC
Severity
The most severe storm Hermosa has seen in the last 12 months
Composite score · 9.3 / 10
Storm severity score
Overview's storm severity score weighs hailstone size, homes in the footprint, and ground-truth reports.
9.3 /10
- Peak hail signal
- 100 /100
- Homes exposed
- 71 /100
- Ground truth
- 100 /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 Hermosa saw the hail — from two instruments
Aug 11, 2026 · Hermosa, 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.
NEXRAD radar signatures Surface resolved
Radar signature field 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.
Max size
0"
Detections
0
Radar-estimated hail size Surface resolved
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.
Max size
4"
The storm in context
Where Aug 11, 2026 sits in Hermosa's hail record.
This was Hermosa's 7th recorded hail day, arriving 14 days after the Jul 28, 2026 storm. By severity it ranks 1st of the 11 storms we have logged here. Radar put the day's largest stone over Hermosa at 4" — radar-estimated size aloft.
The Aug 11, 2026 convective day was bigger than Hermosa: the same system put hail over 1,041 other tracked cities, 44 of them in South Dakota. Nearest: Fairburn (17 miles south, up to 2"); Custer (19 miles west, up to 4"); Rapid City (20 miles northwest, up to 4").
These maps are stills. In the app this date is one of 11 Hermosa 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
23 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
22 reports Hail size 2"
Rockerville Pennington County
“Numerous broken windshields reported. Hail covered the ground and roads. Photo and report via social media. Time estimated based on radar. (UNR)”
— NOAA / SPC storm report
Hail size 2.5"
Rockerville Pennington County
“(UNR)”
— NOAA / SPC storm report
Hail size 2"
2 SSE Rockerville Pennington County
“Relayed via NWS Cheyenne. Time estimated based on radar. (UNR)”
— NOAA / SPC storm report
Hail size 2.5"
1 S Rockerville Pennington County
“Photo via social media. Time estimated based on radar. (UNR)”
— NOAA / SPC storm report
Hail size 3"
2 SW Hermosa Custer County
“Along Highway 36. Photo via social media. Time estimated based on radar. (UNR)”
— NOAA / SPC storm report
Hail size 3.25"
4 W Hermosa Custer County
“Hail lasted for 15 minutes. Broken glass... downspouts and gutters... carport destroyed. (UNR)”
— NOAA / SPC storm report
Hail size 3.6"
2 SSW Hermosa Custer County
“Measured along Highway 79 a bit further north than previous report. Via Spotter Network. Time estimated based on radar. (UNR)”
— NOAA / SPC storm report
Hail size 3.4"
3 SSW Hermosa Custer County
“Measured along Highway 79. Via Spotter Network. Time adjusted based on radar. (UNR)”
— NOAA / SPC storm report
Hail size 3"
7 W Hermosa Custer County
“Measured with a tape measure. Cars reported severely damaged. Time estimated based on radar. (UNR)”
— NOAA / SPC storm report
Hail size 1.5"
3 ESE Hermosa Custer County
“Via Spotter Network. (UNR)”
— NOAA / SPC storm report
Hail size 2.25"
1 SSW Hermosa Custer County
“Measured near the intersection of Highway 36 and Highway 79. Time estimated based on report and radar. (UNR)”
— NOAA / SPC storm report
Hail size 3.5"
Hermosa Custer County
“Photos via social media. Time estimated based on radar. (UNR)”
— NOAA / SPC storm report
Hail size 1.75"
Hermosa Custer County
“Relayed via broadcast media. Time estimated based on report and radar. (UNR)”
— NOAA / SPC storm report
Hail size 2.75"
1 WNW Hermosa Custer County
“Near Southern Hills RV Park and Campground. Photo via social media. Time estimated based on radar. (UNR)”
— NOAA / SPC storm report
Hail size 3"
4 WNW Hermosa Pennington County
“Along Highway 40. Photo via social media. Time estimated based on radar. (UNR)”
— NOAA / SPC storm report
Hail size 2.75"
5 WNW Hermosa Custer County
“Hail lasted for 10-15 minutes (UNR)”
— NOAA / SPC storm report
Hail size 2.75"
5 WNW Hermosa Custer County
“Updated. Hail lasted for 10-15 minutes. 3 skylights were broken. (UNR)”
— NOAA / SPC storm report
Hail size 2.75"
1 E Hayward Pennington County
“Time estimated based on radar. (UNR)”
— NOAA / SPC storm report
Hail size 1.75"
12 ENE Buffalo Gap Custer County
“Mostly quarter size hail with some stones as large as golf balls. Hail did not cover the ground. Winds estimated at 60 MPH. Power out. Time estimated based on radar. (UNR)”
— NOAA / SPC storm report
Hail size 1.5"
3 W Fairburn Custer County
“Only a few stones reaching ping pong ball size. Report via social media. Time estimated based on radar. (UNR)”
— NOAA / SPC storm report
Hail size 2.75"
4 WSW Fairburn Custer County
“Via Spotter Network. Time estimated based on radar. (UNR)”
— NOAA / SPC storm report
Wind reports
1 report Wind gust 60 mph
12 ENE Buffalo Gap Custer County
“Mostly quarter size hail with some stones as large as golf balls. Hail did not cover the ground. Winds estimated at 60 MPH. Power out. Time estimated based on radar. (UNR)”
— 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.
The storm tracked southeast at roughly 15 mph, based on the timing of ground reports.
Hail was reported over 141 minutes, from to .
Reports came from Buffalo Gap, Rockerville, Hayward, and Fairburn — beyond Hermosa itself.
Severe hail signal
What 4" hail means for Hermosa 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.
3,519 homes × $12,000 avg. claim
Potential roof exposure
$42M
Potential roof exposure — 3,519 homes × the ~$12,000 industry-average hail roof claim. Exposure, not confirmed damage.
- Illustrative jobs
- 18 jobs
- Illustrative work
- ~$270K
Close just 0.5% of the 3,519 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
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 $739 on top of the $150 plan.
Hermosa hail history
Other storms in Hermosa.
11 recorded storm days in Hermosa, SD
Estimated-size surface Storm date Hermosa / SD
Aug 24, 2026
0.5" Estimated 0.5"
No ground reports filed Open report →
Estimated-size surface Storm date Hermosa / SD
Aug 23, 2026
1.5" Estimated 1.5"
1 ground report Open report →
Estimated-size surface Storm date Hermosa / SD
Aug 18, 2026
1.25" Estimated 1.25"
No ground reports filed Open report →
Estimated-size surface Storm date Hermosa / SD
Aug 16, 2026
1.25" Estimated 1.25"
No ground reports filed Open report →
Estimated-size surface Storm date Hermosa / SD
Jul 28, 2026
1" Signatures 1" Estimated 0.75"
2 ground reports Open report →
Estimated-size surface Storm date Hermosa / SD
Jul 3, 2026
2.5" Signatures 2.5" Estimated 1.75"
2 ground reports Open report →
Estimated-size surface Storm date Hermosa / SD
Jun 27, 2026
2.5" Signatures 2.5" Estimated 1.5"
1 ground report Open report →
Estimated-size surface Storm date Hermosa / SD
Jun 26, 2026
2.5" Signatures 2.5" Estimated 1.5"
No ground reports filed Open report →
Estimated-size surface Storm date Hermosa / SD
Jun 2, 2026
2.25" Signatures 2.25" Estimated 1.5"
No ground reports filed Open report →
Estimated-size surface Storm date Hermosa / SD
May 31, 2026
1.75" Signatures 1.75" Estimated 1.25"
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 Aug 25, 2026.