Hail size 1"
Oacoma Lyman County
“Hail up to the size of quarters via Facebook report. (ABR)”
— NOAA / SPC storm report
Hail in Oacoma Jul 4, 2026
Hit 30 days agoBoth radar surfaces caught this storm: NEXRAD logged 27 hail signatures up to 1.5", and the radar-estimated size reached 1" aloft.
Largest hailstone
1.5"
≈ ping-pong ball · the largest NEXRAD radar signature Homes in the hail footprint
360
Ground reports
2
2 hailThe 2nd most severe storm Oacoma 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.
4.0 /10
- Hail size
- 38 /100
- Homes exposed
- 51 /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 Oacoma saw the hail — from two instruments
We map this storm two ways: the NEXRAD radar signatures the storm produced overhead, and the radar-estimated size of the hail in the air. The two surfaces don’t have to match — where they diverge is where estimated size aloft ran ahead of, or behind, what the signatures caught.
NEXRAD radar signatures
NEXRAD radar signatures — the point detections the storm produced overhead. A signature is where the radar saw hail, not a confirmed stone on the ground.
Max size
1.5"
Detections
27
Radar-estimated hail size
Maximum hail size as estimated from radar aloft. Treat it as the storm's ceiling — the largest supportable stone — rather than a ground measurement.
Max size
1"
Where Jul 4, 2026 sits in Oacoma's hail record
This was Oacoma's 3rd recorded hail day, arriving 2 days after the Jul 2, 2026 storm. By severity it ranks 2nd of the 5 storms we have logged here. Radar put the day's largest stone over Oacoma at 1.5" — the largest NEXRAD radar signature.
The Jul 4, 2026 convective day was bigger than Oacoma: the same system put hail over 2,035 other tracked cities, 30 of them in South Dakota. Nearest: Gregory (21 miles south, up to 1.75"); Highmore (48 miles north, up to 2.5"); Draper (56 miles west, up to 1").
These maps are stills from Oacoma's Jul 4, 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
2 reports Hail size 1.25"
3 NE Oacoma Lyman County
“mainly dime and nickel size hail with some larger hailstones thrown in. (ABR)”
— 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 18 minutes, from to .
What 1.5" hail means for Oacoma 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
$4.3M
Potential roof exposure — 360 homes × the ~$12,000 industry-average hail roof claim. Exposure, not confirmed damage.
Illustrative jobs
2 jobs
Illustrative work
~$30K
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 Oacoma on the live map
Radar updates in real time, spotter reports appear on the map as they're filed, and the full Oacoma storm history — this Jul 4, 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
Oacoma hail history
← All hail in Oacoma 5 recorded storm days in Oacoma, SD
Other storms in Oacoma
Jul 25, 2026
1.25" Signatures 1.25" Estimated 0.5"
No ground reports filed 
Jul 6, 2026
1.75" Signatures 1.75" Estimated 1"
No ground reports filed 
Jul 2, 2026
1.25" Signatures 1.25" Estimated 0.75"
2
ground reports 
Jun 4, 2026
1.75" Signatures 1.75" Estimated 1.25"
1
ground report
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.