Wind gust 67 mph
8 NNE Grenora Divide County
“67 MPH gust at 10M measured at 8N Grenora NDAWN. (BIS)”
— NOAA / SPC storm report
Hail in Grenora Jun 27, 2026
Hit 37 days agoBoth radar surfaces caught this storm: NEXRAD logged 1 hail signature up to 1", and the radar-estimated size reached 0.75" aloft.
Largest hailstone
1"
≈ quarter · the largest NEXRAD radar signature Homes in the hail footprint
3
Ground reports
2
2 windThe 3rd most severe storm Grenora 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.
2.3 /10
- Hail size
- 25 /100
- Homes exposed
- 12 /100
- Ground truth
- 33 /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 Grenora saw the hail — from two instruments
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
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"
Detections
1
Radar-estimated hail size
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
0.75"
Where Jun 27, 2026 sits in Grenora's hail record
This was Grenora's 2nd recorded hail day, arriving 21 days after the Jun 6, 2026 storm. By severity it ranks 3rd of the 5 storms we have logged here. Radar put the day's largest stone over Grenora at 1" — the largest NEXRAD radar signature.
The Jun 27, 2026 convective day was bigger than Grenora: the same system put hail over 587 other tracked cities, 114 of them in North Dakota. Nearest: Westby (12 miles northwest, up to 1"); Fortuna (13 miles northeast, up to 1"); Zahl (14 miles southeast, up to 1").
These maps are stills from Grenora's Jun 27, 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.
Wind reports
2 reports Wind gust 58 mph
Grenora Williams County
“Report from private weather station. (BIS)”
— 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
Hail was reported over 11 minutes, from to .
What 1" hail means for Grenora roofs
Quarter-size and larger hail is where asphalt shingle damage starts in earnest: bruised mats and granule loss that homeowners can't see from the ground. Most people inside the footprint won't know their roof was hit until someone inspects it.
What this storm is worth to a roofer
$36K
Potential roof exposure — 3 homes × the ~$12,000 industry-average hail roof claim. Exposure, not confirmed damage. Claims from this storm can typically be filed until around June 2028 — the window to reach these homeowners while it's still open. Deadlines vary by policy and state.
Track hail over Grenora on the live map
Radar updates in real time, spotter reports appear on the map as they're filed, and the full Grenora storm history — this Jun 27, 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
Grenora hail history
← All hail in Grenora 5 recorded storm days in Grenora, ND
Other storms in Grenora
Jul 5, 2026
1" Signatures 1"
No ground reports filed 
Jul 3, 2026
1" Signatures 1" Estimated 0.5"
No ground reports filed 
Jul 2, 2026
2.5" Signatures 2.5" Estimated 1"
1
ground report 
Jun 6, 2026
1" Signatures 1" Estimated 0.75"
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.