Tornado Rating unknown
7 NE Artichoke Stevens County
“Tornado touchdown reported 7 miles northeast of Artichoke. Location estimated. (MPX)”
— NOAA / SPC storm report
/ Storm field report · Stevens
Hail in Alberta · Sep 11, 2026
Hit 3 days ago
The estimated-size surface reached 2.75" aloft; NEXRAD logged no point detections over Alberta 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.
A tornado was also reported to the National Weather Service during this storm. The ground reports below show where it was filed.
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Peak hail signal 2.75" ≈ baseball · radar-estimated size aloft
Homes in the hail footprint 763
Ground reports 8 6 hail · 2 tornado
Radar surfaces 1 Estimated size only
Convective day · Sep 11, 2026 · noon–noon UTC
Severity
The most severe storm Alberta has seen in the last 12 months
Composite score · 7.1 / 10
Storm severity score
Overview's storm severity score weighs hailstone size, homes in the footprint, and ground-truth reports.
7.1 /10
- Peak hail signal
- 69 /100
- Homes exposed
- 58 /100
- Ground truth
- 100 /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 Alberta saw the hail — from two instruments
Sep 11, 2026 · Alberta, MN
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.
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
2.75"
Only the radar-estimated size surface resolved for Sep 11, 2026 — this storm produced no NEXRAD point detections over Alberta, so there is one map to show, not two.
The storm in context
Where Sep 11, 2026 sits in Alberta's hail record.
This was Alberta's 4th recorded hail day, arriving 54 days after the Jul 19, 2026 storm. By severity it ranks 1st of the 4 storms we have logged here. Radar put the day's largest stone over Alberta at 2.75" — radar-estimated size aloft.
The Sep 11, 2026 convective day was bigger than Alberta: the same system put hail over 322 other tracked cities, 53 of them in Minnesota. Nearest: Appleton (7 miles south, up to 2.5"); Morris (7 miles east, up to 1.25"); Chokio (8 miles northwest, up to 2.5").
These maps are stills. In the app this date is one of 4 Alberta 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
8 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.
Tornado reports
2 reports Tornado Rating unknown
8 S Alberta Stevens County
“8 power poles blocking county highway 9 near Trinity Lutheran Cemetery. (MPX)”
— NOAA / SPC storm report
Hail reports
6 reports Hail size 1.5"
7 S Alberta Stevens County
“(MPX)”
— NOAA / SPC storm report
Hail size 1.75"
5 E Artichoke Stevens County
“Report from mPING: Golf Ball (1.75 in.). (MPX)”
— NOAA / SPC storm report
Hail size 1"
7 NE Artichoke Stevens County
“Report from mPING: Quarter (1.00 in.). (MPX)”
— NOAA / SPC storm report
Hail size 1.75"
7 S Alberta Stevens County
“(MPX)”
— NOAA / SPC storm report
Hail size 1.75"
7 S Alberta Stevens County
“Golf ball sized hail 8 miles northeast of Artichoke MN reported by Trained Spotter. (MPX)”
— NOAA / SPC storm report
Hail size 1.25"
6 S Alberta Stevens County
“Report from mPING: Half Dollar (1.25 in.). (MPX)”
— 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 52 minutes, from to .
Reports came from Artichoke — beyond Alberta itself.
Severe hail signal
What 2.75" hail means for Alberta 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.
763 homes × $12,000 avg. claim
Potential roof exposure
$9.2M
Potential roof exposure — 763 homes × the ~$12,000 industry-average hail roof claim. Exposure, not confirmed damage.
- Illustrative jobs
- 4 jobs
- Illustrative work
- ~$60K
Close just 0.5% of the 763 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 $160 on top of the $150 plan.
Alberta hail history
Other storms in Alberta.
4 recorded storm days in Alberta, MN
Estimated-size surface Storm date Alberta / MN
Jul 19, 2026
0.75" Estimated 0.75"
No ground reports filed Open report →
Estimated-size surface Storm date Alberta / MN
Jul 7, 2026
1" Signatures 1" Estimated 0.5"
No ground reports filed Open report →
Estimated-size surface Storm date Alberta / MN
Jun 9, 2026
0.75" 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 12, 2026.