Hail size 1"
8 E Lewistown Fergus County
“Public reported quarter-sized hail at Lewistown Divide. (TFX)”
— NOAA / SPC storm report
/ Storm field report · Fergus
Hail in Lewistown · Sep 6, 2026
Hit 6 days ago
The estimated-size surface reached 2.75" aloft; NEXRAD logged no point detections over Lewistown that day. At 2.75" — baseball — this is a severe hail signal associated with roof damage. Open it on the live map to see the swath over the streets.
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Peak hail signal 2.75" ≈ baseball · radar-estimated size aloft
Homes in the hail footprint 1,020
Ground reports 4 4 hail
Radar surfaces 1 Estimated size only
Convective day · Sep 6, 2026 · noon–noon UTC
Severity
The most severe storm Lewistown has seen in the last 12 months
Composite score · 6.6 / 10
Storm severity score
Overview's storm severity score weighs hailstone size, homes in the footprint, and ground-truth reports.
6.6 /10
- Peak hail signal
- 69 /100
- Homes exposed
- 60 /100
- Ground truth
- 67 /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 Lewistown saw the hail — from two instruments
Sep 6, 2026 · Lewistown, MT
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.
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
2.75"
Only the radar-estimated size surface resolved for Sep 6, 2026 — this storm produced no NEXRAD point detections over Lewistown, so there is one map to show, not two.
The storm in context
Where Sep 6, 2026 sits in Lewistown's hail record.
This was Lewistown's 7th recorded hail day, arriving 54 days after the Jul 14, 2026 storm. By severity it ranks 1st of the 7 storms we have logged here. Radar put the day's largest stone over Lewistown at 2.75" — radar-estimated size aloft.
The Sep 6, 2026 convective day was bigger than Lewistown: the same system put hail over 608 other tracked cities, 49 of them in Montana. Nearest: Hilger (13 miles northeast, up to 2.75"); Moccasin (17 miles west, up to 2"); Denton (21 miles northwest, up to 1.5").
These maps are stills. In the app this date is one of 7 Lewistown 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
4 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.
Hail reports
4 reports Hail size 1.5"
6 E Lewistown Fergus County
“Estimated from social media photo from public. (TFX)”
— NOAA / SPC storm report
Hail size 2"
Danvers Fergus County
“Picture from social media. (TFX)”
— NOAA / SPC storm report
Hail size 3"
5 N Hilger Fergus County
“Confirmed with Facebook photo with quarter from the public. (TFX)”
— 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 178 minutes, from to .
Reports came from Danvers and Hilger — beyond Lewistown itself.
Severe hail signal
What 2.75" hail means for Lewistown roofs.
Two-inch-plus hail is capable of puncturing shingles, breaking skylights or windows, and heavily denting soft materials. The strongest radar bands warrant prompt inspection, but neither the signal nor the footprint confirms damage at a specific address.
Radar reading · not confirmed damage
Roofing exposure
What this storm is worth to a roofer.
1,020 homes × $12,000 avg. claim
Potential roof exposure
$12M
Potential roof exposure — 1,020 homes × the ~$12,000 industry-average hail roof claim. Exposure, not confirmed damage.
- Illustrative jobs
- 5 jobs
- Illustrative work
- ~$75K
Close just 0.5% of the 1,020 homes in this footprint at the average $15,000 roof job. Illustrative math, not a projection — your results depend on your outreach and how the market responds.
Claim window
September 2028
Claims from this storm can typically be filed until around September 2028 — the window to reach these homeowners while it's still open. Deadlines vary by policy and state.
Names and phones for every home in the footprint: at most $214 on top of the $150 plan.
Lewistown hail history
Other storms in Lewistown.
7 recorded storm days in Lewistown, MT
Estimated-size surface Storm date Lewistown / MT
Jul 14, 2026
2.5" Estimated 2.5"
2 ground reports Open report →
Estimated-size surface Storm date Lewistown / MT
Jul 5, 2026
No ground reports filed Open report →
Estimated-size surface Storm date Lewistown / MT
Jul 1, 2026
1" Signatures 1" Estimated 0.75"
No ground reports filed Open report →
Estimated-size surface Storm date Lewistown / MT
Jun 26, 2026
1" Signatures 1" Estimated 0.5"
No ground reports filed Open report →
Estimated-size surface Storm date Lewistown / MT
Jun 7, 2026
1" Signatures 1"
No ground reports filed Open report →
Estimated-size surface Storm date Lewistown / MT
May 29, 2026
1" Signatures 1" Estimated 0.75"
No ground reports filed Open report →
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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.