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Hail in Cook County, Illinois

SkyVision detected hail in Cook County, IL near Lemont on July 27, 2026 — estimated up to 5″. See the storm map, timeline, and check any address.

Estimated hail from 2.11″ to 5″ across 4 detection windows, the largest near Lemont.

Sizes are estimates from SkyVision's national detection engine, which analyzes weather radar continuously. Conditions at a specific address vary — check yours.

Record tracked since 2026-10-05.

Storm timeline (estimated sizes)

10:00 AM MDT — up to 2.36″ near Schaumburg
11:00 AM MDT — up to 5″ near Lemont
12:00 PM MDT — up to 5″ near Lemont
1:00 PM MDT — up to 2.11″ near Marley

NWS ground reports (eyewitness)

11:20 AM MDT — 1.75″ hail at 1 Ene Willowbrook
11:30 AM MDT — 1.75″ hail at 1 Ne Tinley Park
11:32 AM MDT — 1.75″ hail at 2 Se Lemont
11:01 AM MDT — 1.5″ hail at 1 E La Grange Park
12:17 PM MDT — 1.5″ hail at 1 E Greater Grand Cross
10:45 AM MDT — 1.25″ hail at 1 Se Schaumburg
10:48 AM MDT — 1.25″ hail at 1 Nw Roselle
11:02 AM MDT — 1.25″ hail at 1 Nw Countryside

How to read this record

One county, one storm day. This record covers Cook County on July 27, 2026: every detection pass that qualified, the largest estimate in each, and where it fell.

Archived. The swath is the frozen storm-day archive. It will not change.

Estimates, not damage. Radar estimates size from the storm; eyewitness reports and inspections confirm what happened on the ground. Radar can overstate the very largest stones, so estimates above 5″ are published as 5″ or larger.

Eyewitness reports. Preliminary local storm reports are ground observations filed with the National Weather Service. They confirm hail fell, not the size at every address.

Check your address. Enter it at the top of the page: the answer is this storm's estimate at that property, then the full dated record there.

Cook County hail questions, answered

Did it hail in Cook County, Illinois on July 27, 2026?

Yes. SkyVision's detection engine estimated hail from 2.11″ to 5″ across 4 detection windows, the largest near Lemont. This record is the frozen storm-day archive.

How big was the hail in Cook County?

The largest estimate across the storm was 5″. Sizes are radar-derived estimates of the largest hail in each detection window, not measurements at a specific address.

Was my house hit?

Enter your address at the top of this page. The answer shows there: the hail estimated at your home on July 27, 2026 and reported nearby. Sign up free to download the dated property storm report.

What size hail damages a roof?

Hail as small as 1″ can bruise asphalt shingles in ways you can’t see from the ground, and that damage often surfaces months later as leaks. Larger hail can crack shingles, dent metal roofing and gutters, and break seals in a single storm.

How accurate are radar-detected hail maps?

Sizes shown are radar-derived estimates of the largest hail in each storm window, produced by SkyVision's own detection engine from national weather radar — not crowd-sourced reports. Ground conditions at a specific address can differ, which is why every map lets you check your exact address.

Was your home in the path? Enter your address at the top of this page and the answer shows here: the hail estimated at your home on July 27, 2026 and reported nearby. Sign up free to download the dated property storm report and get a text when qualifying hail is estimated at your address.