NEXRAD logged 0 hail signatures up to 0"; the estimated-size surface reached 2.75" aloft. At 2.75" — baseball — this is a severe hail signal associated with roof damage. Open it on the live map to see the swath over the streets.
A tornado was also reported to the National Weather Service during this storm. The ground reports below show where it was filed.
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Convective day · Jul 27, 2026 · noon–noon UTC
Severity
Overview's storm severity score weighs hailstone size, homes in the footprint, and ground-truth reports.
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
The maps here read the same storm from two angles — point detections from NEXRAD, and modeled hail size aloft. Where the two disagree is informative: it marks where estimated size outran the signatures, or trailed them.
Radar signature field Where NEXRAD flagged hail as the storm passed — point signatures from the radar, which indicate hail overhead rather than confirm what landed.
Estimated size field The modeled maximum hail size across the swath, derived from radar aloft — the largest stone the storm could have supported, which is not necessarily what reached the ground.
The storm in context
This was Lisle's 7th recorded hail day, arriving 24 days after the Jul 3, 2026 storm. By severity it ranks 1st of the 7 storms we have logged here. Radar put the day's largest stone over Lisle at 2.75" — radar-estimated size aloft.
The Jul 27, 2026 convective day was bigger than Lisle: the same system put hail over 803 other tracked cities, 130 of them in Illinois. Nearest: Wheaton (0 miles north, up to 2.75"); Downers Grove (5 miles east, up to 2.75"); Naperville (6 miles southwest, up to 1.5").
These maps are stills. In the app this date is one of 7 Lisle 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
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.
“Corrects previous tornado report from Wheaton. NWS survey confirms a brief EF-0 tornado started just south of Wheaton College. Tornado was on the ground for 2 minutes o (LOT)”
— NOAA / SPC storm report
“Relayed via mping. Time estimated by radar. (LOT)”
— NOAA / SPC storm report
“Relayed via mping. Time estimated by radar. (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.
Hail was reported over 27 minutes, from to .
Reports came from York Center and Wheaton — beyond Lisle itself.
Severe hail signal
Two-inch-plus hail is capable of puncturing shingles, breaking skylights or windows, and heavily denting soft materials. The strongest radar bands warrant prompt inspection, but neither the signal nor the footprint confirms damage at a specific address.
Radar reading · not confirmed damage
Roofing exposure
Potential roof exposure
$732M
Potential roof exposure — 60,983 homes × the ~$12,000 industry-average hail roof claim. Exposure, not confirmed damage.
Close just 0.5% of the 60,983 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
July 2028
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.
Names and phones for every home in the footprint: at most $12,806 on top of the $150 plan.
Estimated-size surface 
Estimated-size surface 
Estimated-size surface 
Estimated-size surface 
NEXRAD surface 
Estimated-size surface Set your territory and alerts today. When hail hits, use Overview to choose your streets and get moving.
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