AtmostormCounty briefing

Grundy County, IL

Severe-weather activation briefing

Generated 2026-09-20T14:24:34.771291+00:00

1 active warning

Radar over Grundy County, IL with the warned area outlined

In the warned path — county-wide (estimate)

~0 residents

Active warnings (1)

1. Flood Watchuntil 2026-09-20T21:15:00+00:00

Flood Watch issued September 19 at 10:06PM CDT until September 21 at 1:00AM CDT by NWS Chicago IL

In path: ~0 residents.

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

County exposure (baseline)

Grundy County, IL has an estimated 52,533 residents, including 2 nursing homes, 2 mobile-home parks, 2 dialysis centers, 1 hospital and 28 schools. This is the denominator behind “in the warned path”.