Hail in Mammoth · Aug 19, 2026
NEXRAD logged 0 hail signatures up to 0"; the estimated-size surface reached 0.75" aloft. Open it on the live map to see the swath over the streets.
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Convective day · Aug 19, 2026 · noon–noon UTC
Severity
The 2nd most severe storm Mammoth 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
- 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 Mammoth 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.
Radar signature field The point detections NEXRAD recorded overhead. Each signature marks where the radar saw hail aloft — it is a detection, not a stone measured on the ground.
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.
The storm in context
Where Aug 19, 2026 sits in Mammoth's hail record.
This was Mammoth's 2nd recorded hail day, arriving 37 days after the Jul 13, 2026 storm. By severity it ranks 2nd of the 5 storms we have logged here. Radar put the day's largest stone over Mammoth at 0.75" — radar-estimated size aloft.
The Aug 19, 2026 convective day was bigger than Mammoth: the same system put hail over 496 other tracked cities, 25 of them in Arizona. Nearest: Winkelman (14 miles north, up to 0.5"); Tucson (33 miles southwest, up to 1.5"); Florence (44 miles northwest, up to 0.5").
These maps are stills. In the app this date is one of 5 Mammoth 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.
For this storm over Mammoth, the NWS report log is empty — a common outcome, since ground reports only happen when someone witnesses the hail and takes the time to call it in. The detection record for the date lives in the radar maps above.
Near the severe threshold
What 0.75" hail means for Mammoth 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
Mammoth hail history
Other storms in Mammoth.
Estimated-size surface Aug 27, 2026
1"
NEXRAD surface Aug 26, 2026
0.5"
Estimated-size surface Aug 21, 2026
0.5"
Estimated-size surface Jul 13, 2026
0.5"Take your next area into the field.
See the hail, review your recommendations, and canvass with Overview on iPhone.
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