Hail size 1.75"
7 E Lavina Musselshell County
“Estimated 65 mph gusts. (BYZ)”
— NOAA / SPC storm report
Hail in Roundup Jul 16, 2026
Hit 18 days agoThe radar-estimated size surface caught this storm, reaching 1.5" aloft. NEXRAD logged no point detections over Roundup this day.
Largest hailstone
1.5"
≈ ping-pong ball · radar-estimated size aloft Homes in the hail footprint
1,248
Ground reports
3
1 hail · 2 windThe 2nd most severe storm Roundup 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.
4.5 /10
- Hail size
- 38 /100
- Homes exposed
- 62 /100
- Ground truth
- 50 /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 Roundup 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.
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
1.5"
Only the radar-estimated size surface resolved for Jul 16, 2026 — this storm produced no NEXRAD point detections over Roundup, so there is one map to show, not two.
Where Jul 16, 2026 sits in Roundup's hail record
This was Roundup's 8th recorded hail day, arriving 2 days after the Jul 14, 2026 storm. By severity it ranks 2nd of the 9 storms we have logged here. Radar put the day's largest stone over Roundup at 1.5" — radar-estimated size aloft.
The Jul 16, 2026 convective day was bigger than Roundup: the same system put hail over 206 other tracked cities, 40 of them in Montana. Nearest: Musselshell (14 miles southeast, up to 1"); Shepherd (25 miles south, up to 0.5"); Lavina (30 miles southwest, up to 2").
These maps are stills from Roundup's Jul 16, 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
2 reports Wind gust 66 mph
11 SSE Klein Musselshell County
“(BYZ)”
— NOAA / SPC storm report
Wind gust 70 mph
6 E Lavina Golden Valley County
“Pea size hail and very heavy rain. (BYZ)”
— 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
The storm tracked east at roughly 35 mph, based on the timing of ground reports.
Hail was reported over 30 minutes, from to .
Reports came from Lavina and Klein — beyond Roundup itself.
What 1.5" hail means for Roundup 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
$15M
Potential roof exposure — 1,248 homes × the ~$12,000 industry-average hail roof claim. Exposure, not confirmed damage.
Illustrative jobs
6 jobs
Illustrative work
~$90K
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 Roundup on the live map
Radar updates in real time, spotter reports appear on the map as they're filed, and the full Roundup storm history — this Jul 16, 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
Roundup hail history
← All hail in Roundup 9 recorded storm days in Roundup, MT
Other storms in Roundup
Jul 17, 2026
0.75" Estimated 0.75"
No ground reports filed 
Jul 14, 2026
1.5" Estimated 1.5"
2
ground reports 
Jul 7, 2026
2.5" Signatures 2.5" Estimated 1.75"
2
ground reports 
Jul 5, 2026
2" Signatures 2" Estimated 0.75"
No ground reports filed 
Jul 3, 2026
0.5" Signatures 0.5"
No ground reports filed 
Jun 27, 2026
0.75" Signatures 0.75" Estimated 0.5"
No ground reports filed 
Jun 7, 2026
1.25" Signatures 1.25" Estimated 0.5"
No ground reports filed 
May 29, 2026
1" Signatures 1" Estimated 0.5"
No ground reports filed
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.