Hail in Herndon · Aug 27, 2026
The estimated-size surface reached 0.75" aloft; NEXRAD logged no point detections over Herndon that day. Open it on the live map to see the swath over the streets.
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Convective day · Aug 27, 2026 · noon–noon UTC
Severity
The 6th most severe storm Herndon 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
- 27 /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 Herndon 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 Aug 27, 2026 — this storm produced no NEXRAD point detections over Herndon, so there is one map to show, not two.
The storm in context
Where Aug 27, 2026 sits in Herndon's hail record.
This was Herndon's 9th recorded hail day, arriving 2 days after the Aug 25, 2026 storm. By severity it ranks 6th of the 9 storms we have logged here. Radar put the day's largest stone over Herndon at 0.75" — radar-estimated size aloft.
The Aug 27, 2026 convective day was bigger than Herndon: the same system put hail over 365 other tracked cities, 13 of them in Kansas. Nearest: Culbertson (9 miles northwest, up to 0.5"); Oberlin (15 miles southeast, up to 1.75"); Danbury (21 miles east, up to 0.5").
These maps are stills. In the app this date is one of 9 Herndon 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.
No ground reports were filed with the National Weather Service for this storm over Herndon. That is common: a report depends on someone being there to see it and take the time to call it in. The radar surfaces above are the record here — the storm was detected from above even though no one on the ground logged it.
Near the severe threshold
What 0.75" hail means for Herndon 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
$252K
Potential roof exposure — 21 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 $4 on top of the $150 plan.
Herndon hail history
Other storms in Herndon.
Estimated-size surface Aug 25, 2026
0.75"
Estimated-size surface Aug 20, 2026
3.25"
Estimated-size surface Aug 14, 2026
0.5"
Estimated-size surface Jul 8, 2026
1.75"
Estimated-size surface Jul 3, 2026
Estimated-size surface Jun 20, 2026
3.5"
Estimated-size surface May 29, 2026
2.5"
Estimated-size surface May 16, 2026
1"Take your next area into the field.
See the hail, review your recommendations, and canvass with Overview on iPhone.
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