Hail size 2.75"
1 NNE Millersburg Iowa County
“Golfball to baseball sized hail. (DVN)”
— NOAA / SPC storm report
/ Storm field report · Iowa
Hail in Williamsburg · Aug 7, 2026
Hit 36 days ago
The estimated-size surface reached 3" aloft; NEXRAD logged no point detections over Williamsburg that day. At 3" — baseball — 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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Peak hail signal 3" ≈ baseball · radar-estimated size aloft
Homes in the hail footprint 1,076
Ground reports 1 1 hail
Radar surfaces 1 Estimated size only
Convective day · Aug 7, 2026 · noon–noon UTC
Severity
The most severe storm Williamsburg has seen in the last 12 months
Composite score · 6.3 / 10
Storm severity score
Overview's storm severity score weighs hailstone size, homes in the footprint, and ground-truth reports.
6.3 /10
- Peak hail signal
- 75 /100
- Homes exposed
- 61 /100
- Ground truth
- 17 /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 Williamsburg saw the hail — from two instruments
Aug 7, 2026 · Williamsburg, IA
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.
Radar-estimated hail size Surface resolved
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.
Max size
3"
Only the radar-estimated size surface resolved for Aug 7, 2026 — this storm produced no NEXRAD point detections over Williamsburg, so there is one map to show, not two.
The storm in context
Where Aug 7, 2026 sits in Williamsburg's hail record.
This was Williamsburg's 9th recorded hail day, arriving 35 days after the Jul 3, 2026 storm. By severity it ranks 1st of the 9 storms we have logged here. Radar put the day's largest stone over Williamsburg at 3" — radar-estimated size aloft.
The Aug 7, 2026 convective day was bigger than Williamsburg: the same system put hail over 709 other tracked cities, 114 of them in Iowa. Nearest: North English (7 miles south, up to 3"); Webster (9 miles southwest, up to 2.5"); South English (9 miles southeast, up to 1.75").
These maps are stills. In the app this date is one of 9 Williamsburg 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
1 report filed with the NWS
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.
Hail reports
1 reportStorm forensics
How the storm moved
Timing and place names from NOAA ground reports
Read from the arrival times and locations of the NOAA ground reports, not a radar-measured storm track.
Reports came from Millersburg — beyond Williamsburg itself.
Severe hail signal
What 3" hail means for Williamsburg 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.
1,076 homes × $12,000 avg. claim
Potential roof exposure
$13M
Potential roof exposure — 1,076 homes × the ~$12,000 industry-average hail roof claim. Exposure, not confirmed damage.
- Illustrative jobs
- 5 jobs
- Illustrative work
- ~$75K
Close just 0.5% of the 1,076 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
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 $226 on top of the $150 plan.
Williamsburg hail history
Other storms in Williamsburg.
9 recorded storm days in Williamsburg, IA
Estimated-size surface Storm date Williamsburg / IA
Jul 3, 2026
1" Signatures 1" Estimated 0.5"
No ground reports filed Open report →
Estimated-size surface Storm date Williamsburg / IA
Jun 16, 2026
0.5" Estimated 0.5"
No ground reports filed Open report →
Estimated-size surface Storm date Williamsburg / IA
Jun 13, 2026
1" Estimated 1"
No ground reports filed Open report →
Estimated-size surface Storm date Williamsburg / IA
Jun 11, 2026
0.5" Estimated 0.5"
No ground reports filed Open report →
Estimated-size surface Storm date Williamsburg / IA
Apr 23, 2026
1" Signatures 1"
No ground reports filed Open report →
Estimated-size surface Storm date Williamsburg / IA
Apr 17, 2026
1.25" Signatures 1.25" Estimated 0.5"
No ground reports filed Open report →
Estimated-size surface Storm date Williamsburg / IA
Apr 2, 2026
0.75" Signatures 0.75"
1 ground report Open report →
Estimated-size surface Storm date Williamsburg / IA
Mar 30, 2026
No ground reports filed Open report →
Take your next area into the field.
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A storm day here is a convective day — it runs from noon to noon
UTC, so late-night hail is grouped with the afternoon storm that
spawned it rather than split across two calendar dates. Ground
reports are public-domain observations from the NOAA Storm
Prediction Center. Radar tells you where to look. Only an inspection confirms damage at an address. Last updated Aug 8, 2026.