Hail in Flat Rock · May 20, 2026
The estimated-size surface reached 0.5" aloft; NEXRAD logged no point detections over Flat Rock that day. Open it on the live map to see the swath over the streets.
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Convective day · May 20, 2026 · noon–noon UTC
Severity
The 6th most severe storm Flat Rock 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 Flat Rock 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 May 20, 2026 — this storm produced no NEXRAD point detections over Flat Rock, so there is one map to show, not two.
The storm in context
Where May 20, 2026 sits in Flat Rock's hail record.
This was Flat Rock's 1st recorded hail day — the first hail day in our records for the city. By severity it ranks 6th of the 6 storms we have logged here. Radar put the day's largest stone over Flat Rock at 0.5" — radar-estimated size aloft.
The May 20, 2026 convective day was bigger than Flat Rock: the same system put hail over 109 other tracked cities, 3 of them in Alabama. Nearest: Menlo (24 miles southeast, up to 0.75"); La Fayette (27 miles southeast, up to 0.5"); Tracy City (28 miles north, up to 0.5").
These maps are stills. In the app this date is one of 6 Flat Rock 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.
No ground reports were filed with the National Weather Service for this storm over Flat Rock. That is common: a report depends on someone being there to see it and take the time to call it in. The radar surfaces above are the record here — the storm was detected from above even though no one on the ground logged it.
Below the severe threshold
What 0.5" hail means for Flat Rock 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
Flat Rock hail history
Other storms in Flat Rock.
Estimated-size surface Aug 20, 2026
0.5"
Estimated-size surface Aug 7, 2026
0.5"
Estimated-size surface Aug 1, 2026
1"
Estimated-size surface Jul 19, 2026
1"
Estimated-size surface Jul 3, 2026
1.25"The next storm won’t wait for you.
Set your territory and alerts today. When hail hits, use Overview to choose your streets and get moving.
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For iPhone. Android coming soon.
Web trial: 7 days free. Card required. $150/month after the trial unless cancelled.