Hail size 1"
9 ENE Corona Roberts County
“Photo of 1 hailstone from Fish Haven Road in Roberts County. Time estimated by radar and time that the photo was sent. (ABR)”
— NOAA / SPC storm report
/ Storm field report · Roberts
Hail in Big Stone City · Jul 4, 2026
NEXRAD logged 17 hail signatures up to 1.5"; the estimated-size surface reached 0.75" aloft. 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 · the largest NEXRAD radar signature
Homes in the hail footprint 950
Ground reports 3 1 hail · 2 wind
Radar surfaces 2 NEXRAD + estimated size
Convective day · Jul 4, 2026 · noon–noon UTC
Severity
The 2nd most severe storm Big Stone City has seen in the last 12 months
Composite score · 4.5 / 10
Storm severity score
Overview's storm severity score weighs hailstone size, homes in the footprint, and ground-truth reports.
4.5 /10
- Peak hail signal
- 38 /100
- Homes exposed
- 60 /100
- Ground truth
- 50 /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 Big Stone City saw the hail — from two instruments
Jul 4, 2026 · Big Stone City, SD
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.
NEXRAD radar signatures Surface resolved
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.
Max size
1.5"
Detections
17
Radar-estimated hail size Surface resolved
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.
Max size
0.75"
The storm in context
Where Jul 4, 2026 sits in Big Stone City's hail record.
This was Big Stone City's 2nd recorded hail day, arriving 30 days after the Jun 4, 2026 storm. By severity it ranks 2nd of the 6 storms we have logged here. Radar put the day's largest stone over Big Stone City at 1.5" — the largest NEXRAD radar signature.
The Jul 4, 2026 convective day was bigger than Big Stone City: the same system put hail over 2,035 other tracked cities, 30 of them in South Dakota. Nearest: Milbank (8 miles southwest, up to 1.5"); Ortonville (12 miles east, up to 1"); Browns Valley (12 miles northwest, up to 1").
These maps are stills. In the app this date is one of 6 Big Stone City 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
3 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
1 reportWind reports
2 reports Wind gust 65 mph
3 SW Big Stone City Grant County
“Mesonet station 292 Milbank 7NE(SDDOT). (ABR)”
— NOAA / SPC storm report
Wind gust 61 mph
3 SW Big Stone City Grant County
“Mesonet station 292 Milbank 7NE(SDDOT). (ABR)”
— 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 21 minutes, from to .
Reports came from Corona — beyond Big Stone City itself.
High damage potential
What 1.5" hail means for Big Stone City 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.
950 homes × $12,000 avg. claim
Potential roof exposure
$11M
Potential roof exposure — 950 homes × the ~$12,000 industry-average hail roof claim. Exposure, not confirmed damage.
- Illustrative jobs
- 5 jobs
- Illustrative work
- ~$75K
Close just 0.5% of the 950 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
July 2028
Claims from this storm can typically be filed until around July 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 $200 on top of the $150 plan.
Big Stone City hail history
Other storms in Big Stone City.
6 recorded storm days in Big Stone City, SD
Estimated-size surface Storm date Big Stone City / SD
Sep 11, 2026
1" Estimated 1"
No ground reports filed Open report →
Estimated-size surface Storm date Big Stone City / SD
Jul 19, 2026
0.75" Estimated 0.75"
No ground reports filed Open report →
Estimated-size surface Storm date Big Stone City / SD
Jul 10, 2026
1" Signatures 1" Estimated 0.5"
No ground reports filed Open report →
Estimated-size surface Storm date Big Stone City / SD
Jul 6, 2026
1.75" Signatures 1.75" Estimated 1.5"
2 ground reports Open report →
Estimated-size surface Storm date Big Stone City / SD
Jun 4, 2026
1.75" Signatures 1.75" Estimated 1"
1 ground report Open report →
The next storm won’t wait for you.
Set your territory and alerts today. When hail hits, use Overview to choose your streets and get moving.
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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 12, 2026.