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Flash Flood Warning

◍ De Kalb, IL · USA · updated 9/20/2026, 7:12:00 AM

⏱ In effect until 8:00 AM UTC-5

Severity score

65/100

Confidence

High

Why this matters

FFWLOT The National Weather Service in Chicago has issued a * Flash Flood Warning for... Southern De Kalb County in north central Illinois... Northern La Salle County in north central Illinois... Lee County in north central Illinois... * Until 800 AM CDT. * At 212 AM CDT, Doppler radar indicated thunderstorms producing heavy rain across the warned area. Up to 3 inches of rain have fallen. The

Key stats

Severity

Severe

Certainty

Likely

Urgency

Immediate

Timeline

Flash Flood Warning
9/20/2026, 7:12:00 AM
Flash Flood Warning issued September 20 at 2:12AM CDT until September 20 at 8:00AM CDT by NWS Chicago IL

Sources & attribution

OfficialNWS NWS Chicago ILupdated 9/20/2026, 7:12:00 AM

OfficialNWS NWS Chicago ILupdated 9/20/2026, 9:30:00 AM

OfficialNWS NWS Chicago ILupdated 9/20/2026, 3:10:00 AM

OfficialNWS NWS Chicago ILupdated 9/20/2026, 3:06:00 AM

⚠This is an informational severity score, not an official warning. Follow guidance from NWS/NOAA, FEMA (ready.gov), and local emergency management.