Hail in Harpers Ferry · Sep 4, 2026
The estimated-size surface reached 0.5" aloft; NEXRAD logged no point detections over Harpers Ferry that day. Open it on the live map to see the swath over the streets.
7-day free trial in the iPhone app. No card required to start.
For iPhone. Android coming soon.
Web trial: 7 days free. Card required. $150/month after the trial unless cancelled.
Convective day · Sep 4, 2026 · noon–noon UTC
Severity
The 4th most severe storm Harpers Ferry 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
- 13 /100
- Homes exposed
- 61 /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 Harpers Ferry 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-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.
Only the radar-estimated size surface resolved for Sep 4, 2026 — this storm produced no NEXRAD point detections over Harpers Ferry, so there is one map to show, not two.
The storm in context
Where Sep 4, 2026 sits in Harpers Ferry's hail record.
This was Harpers Ferry's 5th recorded hail day, arriving 91 days after the Jun 5, 2026 storm. By severity it ranks 4th of the 5 storms we have logged here. Radar put the day's largest stone over Harpers Ferry at 0.5" — radar-estimated size aloft.
The Sep 4, 2026 convective day was bigger than Harpers Ferry: the same system put hail over 482 other tracked cities, 31 of them in Iowa. Nearest: Lansing (7 miles north, up to 0.75"); Waterville (9 miles northwest, up to 1"); Waukon (13 miles west, up to 1.75").
These maps are stills. In the app this date is one of 5 Harpers Ferry 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 Harpers Ferry. 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.
Below the severe threshold
What 0.5" hail means for Harpers Ferry roofs.
Radar signals under three-quarters of an inch stay below the National Weather Service severe threshold and generally indicate lower roof risk. Older or already-worn materials can still show effects, but radar alone cannot determine whether a specific roof was damaged.
Radar reading · not confirmed damage
Roofing exposure
What this storm is worth to a roofer.
Potential roof exposure
$13M
Potential roof exposure — 1,124 homes × the ~$12,000 industry-average hail roof claim. Exposure, not confirmed damage.
- Illustrative jobs
- 6 jobs
- Illustrative work
- ~$90K
Close just 0.5% of the 1,124 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 $236 on top of the $150 plan.
Harpers Ferry hail history
Other storms in Harpers Ferry.
Estimated-size surface Jun 5, 2026
1"
NEXRAD surface Apr 23, 2026
0.75"
NEXRAD surface Apr 17, 2026
1"
NEXRAD surface Apr 13, 2026
0.5"Take your next area into the field.
See the hail, review your recommendations, and canvass with Overview on iPhone.
7-day free trial in the iPhone app. No card required to start.
For iPhone. Android coming soon.
Web trial: 7 days free. Card required. $150/month after the trial unless cancelled.