The estimated-size surface reached 1.75" aloft; NEXRAD logged no point detections over Glendale Heights that day. 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
Two instruments, one storm: NEXRAD logs the point signatures it detected overhead, while the estimated-size surface models how large the hail aloft could have grown. Agreement between them is not guaranteed — the gaps are where the model ran ahead of, or behind, the detections.
Estimated size field Radar-estimated maximum hail size across the swath, modeled from radar aloft. It reflects the biggest stone the storm could support, which may differ from what actually fell.
Only the radar-estimated size surface resolved for Jul 27, 2026 — this storm produced no NEXRAD point detections over Glendale Heights, so there is one map to show, not two.
The storm in context
This was Glendale Heights's 3rd recorded hail day, arriving 24 days after the Jul 3, 2026 storm. By severity it ranks 1st of the 3 storms we have logged here. Radar put the day's largest stone over Glendale Heights at 1.75" — radar-estimated size aloft.
The Jul 27, 2026 convective day was bigger than Glendale Heights: the same system put hail over 803 other tracked cities, 130 of them in Illinois. Nearest: Carol Stream (0 miles north, up to 1.75"); Lombard (5 miles east, up to 1.75"); West Chicago (5 miles west, up to 1.25").
These maps are stills. In the app this date is one of 3 Glendale Heights 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.
“Updates prior report. An NWS storm survey confirmed an EF-0 tornado with peak winds of 75 mph... peak width of 100 yards... and path length of 1 mile impacted Glen Elly (LOT)”
— NOAA / SPC storm report
“Concentrated tree damage on Stacy Court in North Glen Ellyn... including large trees snapped and/or uprooted... some onto homes and causing damage. This area lines up w (LOT)”
— NOAA / SPC storm report
“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. (LOT)”
— NOAA / SPC storm report
“Quarter size hail in Carol Stream. Location approximate. (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 Carol Stream, York Center, Lisle, Glen Ellyn, and Wheaton — beyond Glendale Heights itself.
High damage potential
Hail around an inch and a half is capable of cracking shingles, stripping granules, and denting gutters, vents, and siding. Risk is usually greatest near the strongest radar signal, but property-level damage still requires an on-site inspection.
Radar reading · not confirmed damage
Roofing exposure
Potential roof exposure
$790M
Potential roof exposure — 65,849 homes × the ~$12,000 industry-average hail roof claim. Exposure, not confirmed damage.
Close just 0.5% of the 65,849 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 $13,828 on top of the $150 plan.
Glendale Heights hail history
Set your territory and alerts today. When hail hits, use Overview to choose your streets and get moving.
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