Tornado Rating unknown
Rye Brook Westchester County
“Trees & wires down around Lawridge Dr in Purchase. (OKX)”
— NOAA / SPC storm report
Hail in West Harrison Jul 21, 2026
Hit 13 days agoBoth radar surfaces caught this storm: NEXRAD logged 3 hail signatures up to 1", and the radar-estimated size reached 0.5" aloft.
A tornado was also reported to the National Weather Service during this storm — see the ground reports below.
Largest hailstone
1"
≈ quarter · the largest NEXRAD radar signature Homes in the hail footprint
1,607
Ground reports
3
3 tornadoWest Harrison's only recorded storm in the last 12 months
Storm severity score
Overview's storm severity score weighs hailstone size, homes in the footprint, and ground-truth reports.
4.6 /10
- Hail size
- 25 /100
- Homes exposed
- 64 /100
- Ground truth
- 100 /100
Largest hailstone — the top predictor of roof damage.
How many homes sit inside the storm's footprint.
Independent storm reports filed with the NWS.
How West Harrison saw the hail — from two instruments
We map this storm two ways: the NEXRAD radar signatures the storm produced overhead, and the radar-estimated size of the hail in the air. The two surfaces don’t have to match — where they diverge is where estimated size aloft ran ahead of, or behind, what the signatures caught.
NEXRAD radar signatures
Map image is still rendering for this surface.
NEXRAD radar signatures — the point detections the storm produced overhead. A signature is where the radar saw hail, not a confirmed stone on the ground.
Max size
1"
Detections
3
Radar-estimated hail size
Map image is still rendering for this surface.
Maximum hail size as estimated from radar aloft. Treat it as the storm's ceiling — the largest supportable stone — rather than a ground measurement.
Max size
0.5"
Where Jul 21, 2026 sits in West Harrison's hail record
This was West Harrison's 1st recorded hail day — the first hail day in our records for the city. By severity it ranks 1st of the 1 storms we have logged here. Radar put the day's largest stone over West Harrison at 1" — the largest NEXRAD radar signature.
The Jul 21, 2026 convective day was bigger than West Harrison: the same system put hail over 703 other tracked cities, 28 of them in New York. Nearest: Greenwich (0 miles north, up to 1"); Riverside (9 miles southeast, up to 1.25"); Mamaroneck (14 miles south, up to 1").
These maps are stills from West Harrison's Jul 21, 2026 storm. In the Overview app the same surfaces are live — radar updating in real time, radar-estimated hail size as it forms, and NWS spotter reports pinned where they're filed — with a radar replay you can scrub back over any past day.
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.
Tornado reports
3 reports Tornado Rating unknown
1 N Harrison Westchester County
“Corrects previous report from tstm wnd dmg to tornado. Several trees down at Manhattanville University. (OKX)”
— NOAA / SPC storm report
Tornado Rating unknown
1 W Rye Brook Westchester County
“Several trees uprooted and/or large limbs broken or sheared in the vicinity of the corner of Lincoln Avenue and Loden Lane. (OKX)”
— NOAA / SPC storm report
Storm forensics
Read from the arrival times and locations of the NOAA ground reports,
not a radar-measured storm track.
How the storm moved
Reports came from Rye Brook and Harrison — beyond West Harrison itself.
What 1" hail means for West Harrison roofs
Quarter-size and larger hail is where asphalt shingle damage starts in earnest: bruised mats and granule loss that homeowners can't see from the ground. Most people inside the footprint won't know their roof was hit until someone inspects it.
What this storm is worth to a roofer
$19M
Potential roof exposure — 1,607 homes × the ~$12,000 industry-average hail roof claim. Exposure, not confirmed damage.
Illustrative jobs
8 jobs
Illustrative work
~$120K
Claims from this storm can typically be filed until around July 2028 — the window to reach these homeowners while it's still open. Deadlines vary by policy and state.
Track hail over West Harrison on the live map
Radar updates in real time, spotter reports appear on the map as they're filed, and the full West Harrison storm history — this Jul 21, 2026 storm included — sits underneath. When you're ready, draw this storm's footprint and pull highly accurate homeowner contact information for every address inside it.
Highly accurate contact information starting at $0.23 per address — every contact included. Digital leads cost $15–$40. Start with a 7-day free trial — no credit card required. See pricing
West Harrison hail history
← All hail in West Harrison 1 recorded storm day in West Harrison, NY
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 surfaces are detections and estimates,
not confirmed damage. Last updated Aug 1, 2026.