Hail in Jefferson · Aug 20, 2026
The estimated-size surface reached 0.75" aloft; NEXRAD logged no point detections over Jefferson that day. Open it on the live map to see the swath over the streets.
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Convective day · Aug 20, 2026 · noon–noon UTC
Severity
The 2nd most severe storm Jefferson 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
- 30 /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 Jefferson saw the hail — from two instruments
Two instruments, one storm: NEXRAD logs the point signatures it detected overhead, while the estimated-size surface models how large the hail aloft could have grown. Agreement between them is not guaranteed — the gaps are where the model ran ahead of, or behind, the detections.
Estimated size field Radar-estimated maximum hail size across the swath, modeled from radar aloft. It reflects the biggest stone the storm could support, which may differ from what actually fell.
Only the radar-estimated size surface resolved for Aug 20, 2026 — this storm produced no NEXRAD point detections over Jefferson, so there is one map to show, not two.
The storm in context
Where Aug 20, 2026 sits in Jefferson's hail record.
This was Jefferson's 4th recorded hail day, arriving 23 days after the Jul 28, 2026 storm. By severity it ranks 2nd of the 4 storms we have logged here. Radar put the day's largest stone over Jefferson at 0.75" — radar-estimated size aloft.
The Aug 20, 2026 convective day was bigger than Jefferson: the same system put hail over 640 other tracked cities, 14 of them in Colorado. Nearest: Como (5 miles west, up to 1"); Grant (13 miles northeast, up to 0.5"); Bailey (17 miles northeast, up to 0.5").
These maps are stills. In the app this date is one of 4 Jefferson 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.
The National Weather Service logged no spotter reports for this storm over Jefferson. That absence is ordinary — filing a report takes a person on the spot who saw the hail and phoned it in. What stands as the record for this date is the radar above, which caught the storm regardless.
Near the severe threshold
What 0.75" hail means for Jefferson 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
$360K
Potential roof exposure — 30 homes × the ~$12,000 industry-average hail roof claim. Exposure, not confirmed damage.
Claim window
August 2028
Claims from this storm can typically be filed until around August 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 $6 on top of the $150 plan.
Jefferson hail history
Other storms in Jefferson.
Estimated-size surface Jul 28, 2026
0.5"
NEXRAD surface Jun 2, 2026
Estimated-size surface May 28, 2026
1.25"Take your next area into the field.
See the hail, review your recommendations, and canvass with Overview on iPhone.
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