Both radar surfaces caught this storm: NEXRAD logged 28 hail signatures up to 1.5", and the radar-estimated size reached 0.75" aloft.
A tornado was also reported to the National Weather Service during this storm — see the ground reports below.
1.5"
≈ ping-pong ball · the largest NEXRAD radar signature1,270
2
2 tornadoOverview's storm severity score weighs hailstone size, homes in the footprint, and ground-truth reports.
Largest hailstone — the top predictor of roof damage.
How many homes sit inside the storm's footprint.
Independent storm reports filed with the NWS.
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.
The point detections NEXRAD recorded overhead. Each signature marks where the radar saw hail aloft — it is a detection, not a stone measured on the ground.
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.
This was Clarkson's 3rd recorded hail day, arriving 12 days after the Jul 9, 2026 storm. By severity it ranks 1st of the 4 storms we have logged here. Radar put the day's largest stone over Clarkson at 1.5" — the largest NEXRAD radar signature.
The Jul 21, 2026 convective day was bigger than Clarkson: the same system put hail over 703 other tracked cities, 101 of them in Kentucky. Nearest: Leitchfield (5 miles west, up to 1.25"); Munfordville (17 miles east, up to 1.5"); Cecilia (20 miles northeast, up to 1").
These maps are stills from Clarkson'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.
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.
“*** 1 INJ *** Corrects previous tornado report start time. NWS Storm survey found an EF-2 tornado that tracked for 21 miles through eastern Grayson County into Hart Cou (LMK)”
— NOAA / SPC storm report
“*** 1 INJ *** NWS Storm survey found an EF-2 tornado that tracked for 21 miles through eastern Grayson County into Hart County. (LMK)”
— NOAA / SPC storm report
Hail was reported over 60 minutes, from to .
Reports came from Wax — beyond Clarkson itself.
At an inch and a half, hail cracks shingles, strips granules down to the mat, and dents gutters, vents, and siding. A footprint like this typically produces a wave of insurance claims — and the contractor who reaches the homeowner first usually gets the inspection.
$15M
Potential roof exposure — 1,270 homes × the ~$12,000 industry-average hail roof claim. Exposure, not confirmed damage.Radar updates in real time, spotter reports appear on the map as they're filed, and the full Clarkson 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
4 recorded storm days in Clarkson, KY
