The radar-estimated size surface caught this storm, reaching 1.5" aloft. NEXRAD logged no point detections over Winthrop this day.
A tornado was also reported to the National Weather Service during this storm — see the ground reports below.
1.5"
≈ ping-pong ball · radar-estimated size aloft2,296
1
1 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.
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 Apr 14, 2026 — this storm produced no NEXRAD point detections over Winthrop, so there is one map to show, not two.
This was Winthrop's 1st recorded hail day — the first hail day in our records for the city. By severity it ranks 1st of the 5 storms we have logged here. Radar put the day's largest stone over Winthrop at 1.5" — radar-estimated size aloft.
The Apr 14, 2026 convective day was bigger than Winthrop: the same system put hail over 476 other tracked cities, 143 of them in Iowa. Nearest: Masonville (5 miles east, up to 1.5"); Rowley (5 miles west, up to 0.75"); Coggon (10 miles southeast, up to 1").
These maps are stills from Winthrop's Apr 14, 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.
“An EF1 tornado began east-southeast of Winthrop and tracked into Delaware County to just east-southeast of Masonville. A barn was completely destroyed at the beginning (DVN)”
— NOAA / SPC storm report
Reports came from Masonville — beyond Winthrop 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.
$28M
Potential roof exposure — 2,296 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 Winthrop storm history — this Apr 14, 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
5 recorded storm days in Winthrop, IA
Jul 2, 2026
2"
Jun 28, 2026
1"
Apr 17, 2026
1.25"
Apr 15, 2026
1"