Hail in Arriba · May 21, 2026
The estimated-size surface reached 2.25" aloft; NEXRAD logged no point detections over Arriba that day. At 2.25" — tennis ball — this is a severe hail signal associated with roof damage. Open it on the live map to see the swath over the streets.
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Convective day · May 21, 2026 · noon–noon UTC
Severity
The 4th most severe storm Arriba 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
- 56 /100
- Homes exposed
- 36 /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 Arriba saw the hail — from two instruments
Each storm gets two readings: the radar signatures NEXRAD recorded as the cells passed overhead, and a modeled estimate of hail size in the air. They are independent surfaces, so a mismatch between them is expected — and worth reading.
Estimated size field Radar-estimated hail size over the swath. The model reports the biggest stone the storm could sustain in the air; what actually fell may have been smaller.
Only the radar-estimated size surface resolved for May 21, 2026 — this storm produced no NEXRAD point detections over Arriba, so there is one map to show, not two.
The storm in context
Where May 21, 2026 sits in Arriba's hail record.
This was Arriba's 2nd recorded hail day, arriving 4 days after the May 17, 2026 storm. By severity it ranks 4th of the 15 storms we have logged here. Radar put the day's largest stone over Arriba at 2.25" — radar-estimated size aloft.
The May 21, 2026 convective day was bigger than Arriba: the same system put hail over 120 other tracked cities, 20 of them in Colorado. Nearest: Genoa (15 miles southwest, up to 1"); Flagler (17 miles northeast, up to 2.25"); Lindon (25 miles north, up to 1.75").
These maps are stills. In the app this date is one of 15 Arriba 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 Arriba 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.
Severe hail signal
What 2.25" hail means for Arriba roofs.
Two-inch-plus hail is capable of puncturing shingles, breaking skylights or windows, and heavily denting soft materials. The strongest radar bands warrant prompt inspection, but neither the signal nor the footprint confirms damage at a specific address.
Radar reading · not confirmed damage
Roofing exposure
What this storm is worth to a roofer.
Potential roof exposure
$732K
Potential roof exposure — 61 homes × the ~$12,000 industry-average hail roof claim. Exposure, not confirmed damage.
Claim window
May 2028
Claims from this storm can typically be filed until around May 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 $13 on top of the $150 plan.
Arriba hail history
Other storms in Arriba.
Sep 5, 2026
1.25"
Estimated-size surface Aug 21, 2026
1"
Estimated-size surface Aug 19, 2026
3.5"
Estimated-size surface Jul 28, 2026
0.75"
Estimated-size surface Jul 23, 2026
2"
Estimated-size surface Jul 22, 2026
2.5"
Estimated-size surface Jul 10, 2026
0.5"
Estimated-size surface Jul 9, 2026
1"
Estimated-size surface Jul 3, 2026
4"
Estimated-size surface Jun 23, 2026
0.75"
Estimated-size surface Jun 21, 2026
0.75"
Estimated-size surface Jun 20, 2026
0.5"
Estimated-size surface Jun 8, 2026
4"
Estimated-size surface May 17, 2026
2"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.