The radar-estimated size surface caught this storm, reaching 2.75" aloft. NEXRAD logged no point detections over Downers Grove this day. 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.
2.75"
≈ baseball · radar-estimated size aloft71,523
15
13 hail · 1 wind · 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.
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.
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.
Only the radar-estimated size surface resolved for Jul 27, 2026 — this storm produced no NEXRAD point detections over Downers Grove, so there is one map to show, not two.
This was Downers Grove's 6th recorded hail day, arriving 44 days after the Jun 13, 2026 storm. By severity it ranks 1st of the 6 storms we have logged here. Radar put the day's largest stone over Downers Grove at 2.75" — radar-estimated size aloft.
The Jul 27, 2026 convective day was bigger than Downers Grove: the same system put hail over 803 other tracked cities, 130 of them in Illinois. Nearest: Lisle (5 miles west, up to 2.75"); Wheaton (5 miles west, up to 2.75"); Western Springs (5 miles east, up to 2.25").
These maps are stills from Downers Grove'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.
“An NWS damage survey confirmed an EF-0 tornado with peak winds of 85 mph... path length of 2.1 miles... and maximum width of 100 yards impacted Downers Grove. (LOT)”
— NOAA / SPC storm report
“Relayed via mping. Time estimated by radar. (LOT)”
— NOAA / SPC storm report
“Photo shared to social media shows half dollar size hail near 67th Street and Clarendon Hills Road. Time estimated by radar. (LOT)”
— NOAA / SPC storm report
“Measured hailstone of 2 inches in diameter. Time estimated by radar. (LOT)”
— NOAA / SPC storm report
“Photo shared on social media of golf ball size hail. (LOT)”
— NOAA / SPC storm report
“Public report of ping pong ball size hail at Oakbrook Terrace. Time estimated by radar. (LOT)”
— NOAA / SPC storm report
“Public report of golf ball size hail in Oak Brook. Time estimated by radar. (LOT)”
— NOAA / SPC storm report
“Report from mPING: Hen Egg (2.00 in.). (LOT)”
— NOAA / SPC storm report
“Trained spotter reported 2 inch diameter hail in Clarendon Hills. Time estimated by radar. (LOT)”
— NOAA / SPC storm report
“Photo shared on social media showing a hailstone roughly two inches in diameter. (LOT)”
— NOAA / SPC storm report
“(LOT)”
— NOAA / SPC storm report
“Relayed via mping. (LOT)”
— NOAA / SPC storm report
“Relayed via mping. (LOT)”
— NOAA / SPC storm report
“Relayed via mping. Time estimated by radar. (LOT)”
— NOAA / SPC storm report
“(LOT)”
— NOAA / SPC storm report
The storm tracked southeast at roughly 10 mph, based on the timing of ground reports.
Hail was reported over 39 minutes, from to .
Reports came from Darien, Willowbrook, Oakbrook Terrace, Oak Brook, Clarendon Hills, and Westmont — beyond Downers Grove itself.
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.
$858M
Potential roof exposure — 71,523 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 Downers Grove 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
6 recorded storm days in Downers Grove, IL
Jun 13, 2026
0.5"
Jun 11, 2026
0.5"
Jun 10, 2026
0.75"
Mar 30, 2026
1.75"
Mar 26, 2026
1.25"