Tornado Rating unknown
3 SSE Shirland Winnebago County
“Trained spotter reports tornado on the ground just southeast of Harrison. (LOT)”
— NOAA / SPC storm report
Hail in Rockton Apr 17, 2026
Both radar surfaces caught this storm: NEXRAD logged 10 hail signatures up to 2.75", and the radar-estimated size reached 1.75" aloft. At 2.75" — baseball — this is severe, roof-replacing hail: close to every roof inside the footprint becomes a claim candidate.
A tornado was also reported to the National Weather Service during this storm — see the ground reports below.
Largest hailstone
2.75"
≈ baseball · the largest NEXRAD radar signature Homes in the hail footprint
508
Ground reports
4
4 tornadoThe most severe storm Rockton has seen in the last 12 months
Storm severity score
Overview's storm severity score weighs hailstone size, homes in the footprint, and ground-truth reports.
7.0 /10
- Hail size
- 69 /100
- Homes exposed
- 54 /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 Rockton 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
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
2.75"
Detections
10
Radar-estimated hail size
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
1.75"
Where Apr 17, 2026 sits in Rockton's hail record
This was Rockton's 4th recorded hail day, arriving 3 days after the Apr 14, 2026 storm. By severity it ranks 1st of the 5 storms we have logged here. Radar put the day's largest stone over Rockton at 2.75" — the largest NEXRAD radar signature.
The Apr 17, 2026 convective day was bigger than Rockton: the same system put hail over 1,016 other tracked cities, 101 of them in Illinois. Nearest: Durand (5 miles west, up to 2.5"); Beloit (10 miles northeast, up to 4"); Davis (10 miles west, up to 3.25").
These maps are stills from Rockton's Apr 17, 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
4 reports Tornado Rating unknown
4 S Shirland Winnebago County
“An NWS damage survey confirmed than a high-end EF-1 tornado with peak winds of 110 mph... path length of 3.74 miles... and maximum width of 125 yards damaged trees and (LOT)”
— NOAA / SPC storm report
Tornado Rating unknown
3 SE Shirland Winnebago County
“An NWS Damage survey confirmed an EF-1 tornado with peak winds of 95 mph... path length of 11.2 miles... and maximum width of 350 yards damaged trees and buildings incl (LOT)”
— NOAA / SPC storm report
Tornado Rating unknown
3 ESE Shirland Winnebago County
“Multiple photos and videos shared via social media show tornado on the ground between Harrison and Rockton. (LOT)”
— 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
Hail was reported over 124 minutes, from to .
Reports came from Shirland — beyond Rockton itself.
What 2.75" hail means for Rockton roofs
Two-inch-plus hail punctures shingles, breaks skylights and windows, and dents anything soft. In the core of a footprint like this, close to every roof is a candidate for an insurance claim. Speed decides who writes those jobs.
What this storm is worth to a roofer
$6.1M
Potential roof exposure — 508 homes × the ~$12,000 industry-average hail roof claim. Exposure, not confirmed damage.
Illustrative jobs
3 jobs
Illustrative work
~$45K
Claims from this storm can typically be filed until around April 2028 — the window to reach these homeowners while it's still open. Deadlines vary by policy and state.
Track hail over Rockton on the live map
Radar updates in real time, spotter reports appear on the map as they're filed, and the full Rockton storm history — this Apr 17, 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
Rockton hail history
← All hail in Rockton 5 recorded storm days in Rockton, IL
Other storms in Rockton
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 3, 2026.