Tornado Rating unknown
6 S Gann Valley Buffalo County
“Tornado on the ground. (ABR)”
— NOAA / SPC storm report
/ Storm field report · Buffalo
Hail in Gann Valley · Jul 2, 2026
NEXRAD logged 37 hail signatures up to 2.75"; the estimated-size surface reached 2.25" aloft. At 2.75" — baseball — this is a severe hail signal associated with roof damage. Open it on the live map to see the swath over the streets.
A tornado was also reported to the National Weather Service during this storm. The ground reports below show where it was filed.
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Peak hail signal 2.75" ≈ baseball · the largest NEXRAD radar signature
Homes in the hail footprint 161
Ground reports 7 3 hail · 2 wind · 2 tornado
Radar surfaces 2 NEXRAD + estimated size
Convective day · Jul 2, 2026 · noon–noon UTC
Severity
The most severe storm Gann Valley has seen in the last 12 months
Composite score · 6.7 / 10
Storm severity score
Overview's storm severity score weighs hailstone size, homes in the footprint, and ground-truth reports.
6.7 /10
- Peak hail signal
- 69 /100
- Homes exposed
- 44 /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 Gann Valley saw the hail — from two instruments
Jul 2, 2026 · Gann Valley, 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
2.75"
Detections
37
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
2.25"
The storm in context
Where Jul 2, 2026 sits in Gann Valley's hail record.
This was Gann Valley's 2nd recorded hail day, arriving 23 days after the Jun 9, 2026 storm. By severity it ranks 1st of the 6 storms we have logged here. Radar put the day's largest stone over Gann Valley at 2.75" — the largest NEXRAD radar signature.
The Jul 2, 2026 convective day was bigger than Gann Valley: the same system put hail over 1,147 other tracked cities, 153 of them in South Dakota. Nearest: Wessington Springs (15 miles east, up to 3"); Ree Heights (19 miles northwest, up to 2.5"); Wessington (21 miles northeast, up to 1.75").
These maps are stills. In the app this date is one of 6 Gann Valley 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
7 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.
Tornado reports
2 reports Tornado Rating unknown
2 E Gann Valley Buffalo County
“Several photos on X of a tornado on the ground near Gann Valley. Location estimated via radar. (ABR)”
— NOAA / SPC storm report
Hail reports
3 reports Hail size 2.75"
7 WNW Gann Valley Buffalo County
“report relayed via EM... golf ball to baseball size hail with heavy rain. Location and time estimated. (ABR)”
— NOAA / SPC storm report
Hail size 1.75"
7 SSW Gann Valley Buffalo County
“(ABR)”
— NOAA / SPC storm report
Hail size 3"
7 SSW Gann Valley Buffalo County
“Photo relayed via text... included spotter ruler card. (ABR)”
— NOAA / SPC storm report
Wind reports
2 reports Wind gust 81 mph
3 N Gann Valley Buffalo County
“Mesonet station 201 Gann Valley (SDDOT). (ABR)”
— NOAA / SPC storm report
Wind gust 62 mph
3 N Gann Valley Buffalo County
“Mesonet station 201 Gann Valley (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.
The storm tracked north at roughly 5 mph, based on the timing of ground reports.
Hail was reported over 110 minutes, from to .
Severe hail signal
What 2.75" hail means for Gann Valley 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.
161 homes × $12,000 avg. claim
Potential roof exposure
$1.9M
Potential roof exposure — 161 homes × the ~$12,000 industry-average hail roof claim. Exposure, not confirmed damage.
- Illustrative jobs
- 1 job
- Illustrative work
- ~$15K
Close just 0.5% of the 161 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 $34 on top of the $150 plan.
Gann Valley hail history
Other storms in Gann Valley.
6 recorded storm days in Gann Valley, SD
Estimated-size surface Storm date Gann Valley / SD
Sep 4, 2026
1.25" Estimated 1.25"
No ground reports filed Open report →
Estimated-size surface Storm date Gann Valley / SD
Sep 3, 2026
0.5" Estimated 0.5"
No ground reports filed Open report →
Estimated-size surface Storm date Gann Valley / SD
Sep 1, 2026
0.5" Estimated 0.5"
No ground reports filed Open report →
Estimated-size surface Storm date Gann Valley / SD
Jul 25, 2026
1.25" Signatures 1.25" Estimated 0.75"
No ground reports filed Open report →
Estimated-size surface Storm date Gann Valley / SD
Jun 9, 2026
0.75" Estimated 0.75"
No ground reports filed 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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For iPhone. Android coming soon.
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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 5, 2026.