AtmostormCounty briefing

Cook County, IL

Severe-weather activation briefing

Generated 2026-09-20T14:18:47.267413+00:00

2 active warnings

Radar over Cook County, IL with the warned area outlined

In the warned path — county-wide (estimate)

~1,700,000 residents, plus 51 nursing homes, 9 mobile-home parks, 56 dialysis centers, 14 hospitals and 529 schools

Active warnings (2)

1. Flood Warninguntil 2026-09-20T18:00:00+00:00

Flood Warning issued September 19 at 9:05PM CDT until September 21 at 3:00AM CDT by NWS Chicago IL

In path: ~43,000 residents, 2 nursing homes, 3 dialysis centers and 13 schools.

Storm details · Full facility list (per-warning briefing)

2. Flood Advisoryuntil 2026-09-20T15:00:00+00:00

Flood Advisory issued September 20 at 7:04AM CDT until September 20 at 10:00AM CDT by NWS Chicago IL

In path: ~1,700,000 residents, 49 nursing homes, 9 mobile-home parks, 53 dialysis centers, 14 hospitals and 516 schools.

Storm details · Full facility list (per-warning briefing)

County exposure (baseline)

Cook County, IL has an estimated 5,275,541 residents, including 201 nursing homes, 20 mobile-home parks, 137 dialysis centers, 48 hospitals and 1,402 schools. This is the denominator behind “in the warned path”.