Hail size 1.5"
4 WNW Mount Vernon Aurora County
“Report via social media. Time estimated via radar. (FSD)”
— NOAA / SPC storm report
Hail in Mount Vernon Jul 2, 2026
Hit 32 days agoBoth radar surfaces caught this storm: NEXRAD logged 9 hail signatures up to 1.75", and the radar-estimated size reached 1.25" aloft.
Largest hailstone
1.75"
≈ golf ball · the largest NEXRAD radar signature Homes in the hail footprint
129
Ground reports
2
1 hail · 1 windThe most severe storm Mount Vernon has seen in the last 12 months
Storm severity score
Overview's storm severity score weighs hailstone size, homes in the footprint, and ground-truth reports.
4.2 /10
- Hail size
- 44 /100
- Homes exposed
- 42 /100
- Ground truth
- 33 /100
Largest hailstone — the top predictor of roof damage.
How many homes sit inside the storm's footprint.
Independent storm reports filed with the NWS.
How Mount Vernon saw the hail — from two instruments
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
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
1.75"
Detections
9
Radar-estimated hail size
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
1.25"
Where Jul 2, 2026 sits in Mount Vernon's hail record
This was Mount Vernon's 3rd recorded hail day, arriving 2 days after the Jun 30, 2026 storm. By severity it ranks 1st of the 3 storms we have logged here. Radar put the day's largest stone over Mount Vernon at 1.75" — the largest NEXRAD radar signature.
The Jul 2, 2026 convective day was bigger than Mount Vernon: the same system put hail over 1,147 other tracked cities, 153 of them in South Dakota. Nearest: Plankinton (10 miles southwest, up to 1.75"); Letcher (14 miles northeast, up to 2"); Mitchell (14 miles southeast, up to 1.75").
These maps are stills from Mount Vernon's Jul 2, 2026 storm. In the Overview app the same surfaces are live — radar updating in real time, radar-estimated hail size as it forms, and NWS spotter reports pinned where they're filed — with a radar replay you can scrub back over any past day.
What people on the ground reported
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
1 report Wind gust 64 mph
9 NNW Mount Vernon Davison County
“(FSD)”
— NOAA / SPC storm report
Storm forensics
Read from the arrival times and locations of the NOAA ground reports,
not a radar-measured storm track.
How the storm moved
Hail was reported over 10 minutes, from to .
What 1.75" hail means for Mount Vernon roofs
At an inch and a half, hail cracks shingles, strips granules down to the mat, and dents gutters, vents, and siding. A footprint like this typically produces a wave of insurance claims — and the contractor who reaches the homeowner first usually gets the inspection.
What this storm is worth to a roofer
$1.5M
Potential roof exposure — 129 homes × the ~$12,000 industry-average hail roof claim. Exposure, not confirmed damage.
Illustrative jobs
1 job
Illustrative work
~$15K
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.
Track hail over Mount Vernon on the live map
Radar updates in real time, spotter reports appear on the map as they're filed, and the full Mount Vernon storm history — this Jul 2, 2026 storm included — sits underneath. When you're ready, draw this storm's footprint and pull highly accurate homeowner contact information for every address inside it.
Highly accurate contact information starting at $0.23 per address — every contact included. Digital leads cost $15–$40. Start with a 7-day free trial — no credit card required. See pricing
Mount Vernon hail history
← All hail in Mount Vernon 3 recorded storm days in Mount Vernon, SD
Other storms in Mount Vernon
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 surfaces are detections and estimates,
not confirmed damage. Last updated Aug 3, 2026.