Wind gust 59 mph
12 S Vivian Lyman County
“Mesonet station VVMS2 Vivian 12S (SD Mesonet). (ABR)”
— NOAA / SPC storm report
/ Storm field report · Lyman
Hail in Vivian · Jun 4, 2026
NEXRAD logged 1 hail signature up to 1.75"; 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 1.75" ≈ golf ball · the largest NEXRAD radar signature
Homes in the hail footprint 0
Ground reports 3 3 wind
Radar surfaces 2 NEXRAD + estimated size
Convective day · Jun 4, 2026 · noon–noon UTC
Severity
The 2nd most severe storm Vivian has seen in the last 12 months
Composite score · 3.4 / 10
Storm severity score
Overview's storm severity score weighs hailstone size, homes in the footprint, and ground-truth reports.
3.4 /10
- Peak hail signal
- 44 /100
- Homes exposed
- 0 /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 Vivian saw the hail — from two instruments
Jun 4, 2026 · Vivian, SD
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 Surface resolved
Radar signature field 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
1
Radar-estimated hail size Surface resolved
Estimated size field 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
0.75"
The storm in context
Where Jun 4, 2026 sits in Vivian's hail record.
This was Vivian's 2nd recorded hail day, arriving 2 days after the Jun 2, 2026 storm. By severity it ranks 2nd of the 5 storms we have logged here. Radar put the day's largest stone over Vivian at 1.75" — the largest NEXRAD radar signature.
The Jun 4, 2026 convective day was bigger than Vivian: the same system put hail over 241 other tracked cities, 80 of them in South Dakota. Nearest: Presho (10 miles east, up to 1.75"); Draper (10 miles west, up to 1"); Murdo (23 miles west, up to 1.75").
These maps are stills. In the app this date is one of 5 Vivian 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.
Wind reports
3 reports Wind gust 68 mph
9 NNW Vivian Lyman County
“Mesonet station 13 Vivian (SDDOT). (ABR)”
— NOAA / SPC storm report
Wind gust 64 mph
9 NNW Vivian Lyman County
“Mesonet station 13 Vivian (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 14 minutes, from to .
High damage potential
What 1.75" hail means for Vivian 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
Vivian hail history
Other storms in Vivian.
5 recorded storm days in Vivian, SD
Estimated-size surface Storm date Vivian / SD
Aug 10, 2026
0.5" Estimated 0.5"
No ground reports filed Open report →
Estimated-size surface Storm date Vivian / SD
Jul 2, 2026
1.75" Signatures 1.75" Estimated 0.75"
No ground reports filed Open report →
Estimated-size surface Storm date Vivian / SD
Jun 28, 2026
1" Signatures 1" Estimated 1"
2 ground reports Open report →
Estimated-size surface Storm date Vivian / SD
Jun 2, 2026
1" Signatures 1" Estimated 0.5"
1 ground report Open report →
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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 Aug 11, 2026.