Wind gust 60 mph
3 N Rockyford Oglala Lakota County
“Measured on a personal weather station. (UNR)”
— NOAA / SPC storm report
/ Storm field report · Oglala Lakota
Hail in Porcupine · Jun 27, 2026
NEXRAD logged 1 hail signature up to 1.75"; the estimated-size surface reached 1.25" aloft. Open it on the live map to see the swath over the streets.
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Peak hail signal 1.75" ≈ golf ball · the largest NEXRAD radar signature
Homes in the hail footprint 0
Ground reports 1 1 wind
Radar surfaces 2 NEXRAD + estimated size
Convective day · Jun 27, 2026 · noon–noon UTC
Severity
The 5th most severe storm Porcupine has seen in the last 12 months
Composite score · 2.9 / 10
Storm severity score
Overview's storm severity score weighs hailstone size, homes in the footprint, and ground-truth reports.
2.9 /10
- Peak hail signal
- 44 /100
- Homes exposed
- 0 /100
- Ground truth
- 17 /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 Porcupine saw the hail — from two instruments
Jun 27, 2026 · Porcupine, 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
1.75"
Detections
1
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
1.25"
The storm in context
Where Jun 27, 2026 sits in Porcupine's hail record.
This was Porcupine's 4th recorded hail day, arriving 23 days after the Jun 4, 2026 storm. By severity it ranks 5th of the 8 storms we have logged here. Radar put the day's largest stone over Porcupine at 1.75" — the largest NEXRAD radar signature.
The Jun 27, 2026 convective day was bigger than Porcupine: the same system put hail over 587 other tracked cities, 131 of them in South Dakota. Nearest: Kyle (8 miles northeast, up to 1.75"); Manderson (11 miles west, up to 1.75"); Wounded Knee (12 miles southwest, up to 1.75").
These maps are stills. In the app this date is one of 8 Porcupine 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
1 report 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.
Wind reports
1 reportStorm 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.
Reports came from Rockyford — beyond Porcupine itself.
High damage potential
What 1.75" hail means for Porcupine 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
Porcupine hail history
Other storms in Porcupine.
8 recorded storm days in Porcupine, SD
Estimated-size surface Storm date Porcupine / SD
Sep 6, 2026
1" Estimated 1"
No ground reports filed Open report →
Estimated-size surface Storm date Porcupine / SD
Aug 17, 2026
2" Estimated 2"
3 ground reports Open report →
Estimated-size surface Storm date Porcupine / SD
Aug 16, 2026
0.5" Estimated 0.5"
No ground reports filed Open report →
Estimated-size surface Storm date Porcupine / SD
Jun 28, 2026
4" Signatures 4" Estimated 2.25"
No ground reports filed Open report →
Estimated-size surface Storm date Porcupine / SD
Jun 4, 2026
1" Signatures 1" Estimated 0.75"
No ground reports filed Open report →
Estimated-size surface Storm date Porcupine / SD
Jun 2, 2026
2.75" Signatures 2.75" Estimated 1.75"
1 ground report Open report →
Estimated-size surface Storm date Porcupine / SD
May 30, 2026
1.75" Signatures 1.75" Estimated 1"
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 7, 2026.