Hail in Knoxville · Aug 12, 2026
The estimated-size surface reached 0.5" aloft; NEXRAD logged no point detections over Knoxville that day. Open it on the live map to see the swath over the streets.
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Convective day · Aug 12, 2026 · noon–noon UTC
Severity
The 10th most severe storm Knoxville 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 Knoxville 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 Aug 12, 2026 — this storm produced no NEXRAD point detections over Knoxville, so there is one map to show, not two.
The storm in context
Where Aug 12, 2026 sits in Knoxville's hail record.
This was Knoxville's 9th recorded hail day, arriving 23 days after the Jul 20, 2026 storm. By severity it ranks 10th of the 11 storms we have logged here. Radar put the day's largest stone over Knoxville at 0.5" — radar-estimated size aloft.
The Aug 12, 2026 convective day was bigger than Knoxville: the same system put hail over 507 other tracked cities, 50 of them in Iowa. Nearest: Polk City (50 miles northwest, up to 0.5"); Huxley (52 miles northwest, up to 0.5"); Madrid (54 miles northwest, up to 0.5").
These maps are stills. In the app this date is one of 11 Knoxville 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.
Nobody on the ground filed a report over Knoxville for this date, which says more about who was watching than about the storm: spotter reports only exist where there is an observer. The radar surfaces above carry the evidence for this one.
Below the severe threshold
What 0.5" hail means for Knoxville 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
Knoxville hail history
Other storms in Knoxville.
Sep 8, 2026
0.5"
Estimated-size surface Aug 13, 2026
0.5"
Estimated-size surface Jul 20, 2026
1.75"
Estimated-size surface Jul 3, 2026
1.75"
Estimated-size surface Jun 11, 2026
2.75"
Estimated-size surface Jun 10, 2026
0.5"
Estimated-size surface Jun 5, 2026
2.5"
Estimated-size surface May 18, 2026
0.5"
Estimated-size surface May 15, 2026
1"
Estimated-size surface Apr 17, 2026
1.5"Take your next area into the field.
See the hail, review your recommendations, and canvass with Overview on iPhone.
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