Hail in Clark Fork · Sep 6, 2026
The estimated-size surface reached 0.5" aloft; NEXRAD logged no point detections over Clark Fork that day. Open it on the live map to see the swath over the streets.
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Convective day · Sep 6, 2026 · noon–noon UTC
Severity
The 2nd most severe storm Clark Fork has seen in the last 12 months
Overview's storm severity score weighs hailstone size, homes in the footprint, and ground-truth reports.
- Peak hail signal
- 13 /100
- Homes exposed
- 0 /100
- Ground truth
- 0 /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 Clark Fork 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.
Estimated size field Maximum hail size as estimated from radar aloft. Treat it as the storm's ceiling — the largest supportable stone — rather than a ground measurement.
Only the radar-estimated size surface resolved for Sep 6, 2026 — this storm produced no NEXRAD point detections over Clark Fork, so there is one map to show, not two.
The storm in context
Where Sep 6, 2026 sits in Clark Fork's hail record.
This was Clark Fork's 2nd recorded hail day, arriving 101 days after the May 28, 2026 storm. By severity it ranks 2nd of the 2 storms we have logged here. Radar put the day's largest stone over Clark Fork at 0.5" — radar-estimated size aloft.
The Sep 6, 2026 convective day was bigger than Clark Fork: the same system put hail over 608 other tracked cities, 2 of them in Idaho. Nearest: Heron (12 miles southeast, up to 1"); Noxon (14 miles east, up to 1"); Athol (20 miles west, up to 0.75").
These maps are stills. In the app this date is one of 2 Clark Fork 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
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.
The National Weather Service logged no spotter reports for this storm over Clark Fork. That absence is ordinary — filing a report takes a person on the spot who saw the hail and phoned it in. What stands as the record for this date is the radar above, which caught the storm regardless.
Below the severe threshold
What 0.5" hail means for Clark Fork roofs.
Radar signals under three-quarters of an inch stay below the National Weather Service severe threshold and generally indicate lower roof risk. Older or already-worn materials can still show effects, but radar alone cannot determine whether a specific roof was damaged.
Radar reading · not confirmed damage
Clark Fork hail history
Other storms in Clark Fork.
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