Hail in San Jose · Sep 15, 2026
The estimated-size surface reached 0.75" aloft; NEXRAD logged no point detections over San Jose that day. Open it on the live map to see the swath over the streets.
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Convective day · Sep 15, 2026 · noon–noon UTC
Severity
The 3rd most severe storm San Jose 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
- 57 /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 San Jose saw the hail — from two instruments
The maps here read the same storm from two angles — point detections from NEXRAD, and modeled hail size aloft. Where the two disagree is informative: it marks where estimated size outran the signatures, or trailed them.
Estimated size field The modeled maximum hail size across the swath, derived from radar aloft — the largest stone the storm could have supported, which is not necessarily what reached the ground.
Only the radar-estimated size surface resolved for Sep 15, 2026 — this storm produced no NEXRAD point detections over San Jose, so there is one map to show, not two.
The storm in context
Where Sep 15, 2026 sits in San Jose's hail record.
This was San Jose's 8th recorded hail day, arriving 25 days after the Aug 21, 2026 storm. By severity it ranks 3rd of the 8 storms we have logged here. Radar put the day's largest stone over San Jose at 0.75" — radar-estimated size aloft.
The Sep 15, 2026 convective day was bigger than San Jose: the same system put hail over 169 other tracked cities, 31 of them in Illinois. Nearest: Tremont (17 miles northeast, up to 1.5"); Mackinaw (21 miles northeast, up to 1.25"); Elkhart (23 miles southeast, up to 0.5").
These maps are stills. In the app this date is one of 8 San Jose 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 San Jose, 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 San Jose 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
$8.9M
Potential roof exposure — 741 homes × the ~$12,000 industry-average hail roof claim. Exposure, not confirmed damage.
- Illustrative jobs
- 4 jobs
- Illustrative work
- ~$60K
Close just 0.5% of the 741 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 $156 on top of the $150 plan.
San Jose hail history
Other storms in San Jose.
Estimated-size surface Aug 21, 2026
0.75"
Estimated-size surface Jul 10, 2026
0.5"
Estimated-size surface Jun 17, 2026
0.75"
Estimated-size surface Jun 11, 2026
0.75"
Estimated-size surface May 4, 2026
1"
Estimated-size surface Apr 27, 2026
1.25"
Estimated-size surface Mar 6, 2026
0.5"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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