Hail in Altoona · Sep 21, 2026
The estimated-size surface reached 0.75" aloft; NEXRAD logged no point detections over Altoona that day. Open it on the live map to see the swath over the streets.
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Convective day · Sep 21, 2026 · noon–noon UTC
Severity
The 5th most severe storm Altoona 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
- 19 /100
- Homes exposed
- 63 /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 Altoona 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 21, 2026 — this storm produced no NEXRAD point detections over Altoona, so there is one map to show, not two.
The storm in context
Where Sep 21, 2026 sits in Altoona's hail record.
This was Altoona's 8th recorded hail day, arriving 18 days after the Sep 3, 2026 storm. By severity it ranks 5th of the 8 storms we have logged here. Radar put the day's largest stone over Altoona at 0.75" — radar-estimated size aloft.
The Sep 21, 2026 convective day was bigger than Altoona: the same system put hail over 498 other tracked cities, 92 of them in Alabama. Nearest: Boaz (4 miles northeast, up to 1.25"); Blountsville (13 miles northwest, up to 0.75"); Albertville (15 miles north, up to 1.5").
These maps are stills. In the app this date is one of 8 Altoona 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 Altoona 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.
Near the severe threshold
What 0.75" hail means for Altoona roofs.
A signal this size sits near the National Weather Service severe threshold. Aging shingles and soft metals such as vents, flashing, and gutters may be more vulnerable; roof age, wind, and material condition all matter, and only an inspection can confirm damage.
Radar reading · not confirmed damage
Roofing exposure
What this storm is worth to a roofer.
Potential roof exposure
$16M
Potential roof exposure — 1,334 homes × the ~$12,000 industry-average hail roof claim. Exposure, not confirmed damage.
- Illustrative jobs
- 7 jobs
- Illustrative work
- ~$105K
Close just 0.5% of the 1,334 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 $280 on top of the $150 plan.
Altoona hail history
Other storms in Altoona.
Estimated-size surface Sep 3, 2026
0.75"
Estimated-size surface Aug 20, 2026
0.5"
Estimated-size surface Jul 5, 2026
2.25"
Estimated-size surface Jul 3, 2026
1"
Estimated-size surface Jul 2, 2026
1"
Estimated-size surface Jun 1, 2026
2"
Estimated-size surface Feb 26, 2026
4"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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Web trial: 7 days free. Card required. $150/month after the trial unless cancelled.