≋floodactive

Flash Flood Warning issued August 1 at 6:25AM CDT until August 1 at 9:30AM CDT by NWS Chicago IL

8.0

41.6033° N, 88.2800° W·US-IL

Started 2h ago

Event Details

Typeflood

Severity8.0

Statusactive

Location41.6033°N, 88.2800°W (US-IL)

Started2026-08-01T11:25:00+00:00

Last Updated2026-08-01T14:10:49.718+00:00

Sourcenoaa_ahps

Source URLapi.weather.gov

Confidence1.00

Impact Zones

Catastrophic Impact Zone

Flash flooding or major flood stage. Immediate danger to life and property.

NWS polygon

Zone estimates are based on scientific models and may differ from actual local conditions.

Impact Analysis

Note: Zone 1 uses NWS polygon geometry. Exposure for this zone is pending polygon-based computation — totals reflect outer zones only.

Population from ACS 5-Year 2022 tract sampling; structure counts from Microsoft Building Footprints or Census ACS housing data, capped by USGS NLCD 2021 developed land. Estimates for situational awareness — not for actuarial, regulatory, or underwriting use.

Historical Comparison

2013 LA SALLE County, ILLINOIS Flash Flood (2013)75% match

Flash Flood in ILLINOIS, 27km from current event, $75M in recorded damage

LA SALLE County, ILLINOISDamage: $75.0MFatalities: 1

2013 GRUNDY County, ILLINOIS Flash Flood (2013)72% match

Flash Flood in ILLINOIS, 31km from current event, $15M in recorded damage

GRUNDY County, ILLINOISDamage: $15.0M

2014 COOK County, ILLINOIS Flash Flood (2014)72% match

Flash Flood in ILLINOIS, 39km from current event, $50M in recorded damage

COOK County, ILLINOISDamage: $50.0M

Historical comparison based on peril type, geography, and severity. Past events do not predict future outcomes.

View on Live Map

US-IL flood hazard profile All US hazard profiles Scoring methodology

Zone estimates are based on scientific models and may differ from actual local conditions.