The radar-estimated size surface caught this storm, reaching 1.75" aloft. NEXRAD logged no point detections over Glendale Heights this day.
A tornado was also reported to the National Weather Service during this storm — see the ground reports below.
1.75"
≈ golf ball · radar-estimated size aloft65,849
7
4 hail · 3 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.
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.
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.
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 from Glendale Heights's Jul 27, 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.
“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
Hail was reported over 27 minutes, from to .
Reports came from Carol Stream, York Center, Lisle, Glen Ellyn, and Wheaton — beyond Glendale Heights 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.
$790M
Potential roof exposure — 65,849 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 Glendale Heights storm history — this Jul 27, 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
3 recorded storm days in Glendale Heights, IL
