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Flash Flood Warning — DuPage County, IL, Will County, IL
Flash Flood Warning
Issued
4:35 PM CDT · Sat, Jul 4 2026
Expires
9:30 PM CDT · Sat, Jul 4 2026
Issuing Office
NWS KLOT

Affected Areas

DuPage County, IL Will County, IL

Official Bulletin

330
WGUS53 KLOT 042135 RRA
FFWLOT
ILC043-197-050230-
/O.NEW.KLOT.FF.W.0033.260704T2135Z-260705T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Chicago IL
435 PM CDT Sat Jul 4 2026

The National Weather Service in Chicago has issued a

* Flash Flood Warning for...
  Southern DuPage County in northeastern Illinois...
  Northwestern Will County in northeastern Illinois...

* Until 930 PM CDT.

* At 435 PM CDT, Doppler radar and automated rain gauges indicated
  thunderstorms producing rainfall rates of up to 3 inches per hour
  across the warned area. Additional rainfall amounts up to 3 inches
  or more are possible in the warned area. Significant flash
  flooding is ongoing or expected to begin shortly.

  HAZARD...Significant flash flooding.

  SOURCE...Radar and automated gauges.

  IMPACT...Rapid-onset, significant flooding of creeks, streams,
           drainage ditches, low-lying areas, and poor drainage
           areas. Widespread street and underpass flooding.
           Possible flooding of structures. Possible flooding of
           highways.

* Some locations that will experience flash flooding include...
  Aurora, Naperville, Bolingbrook, Downers Grove, Romeoville,
  Woodridge, Lemont, Burr Ridge, Westmont, Lisle, Darien,
  Warrenville, Willowbrook and Willow Springs.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flash Flood Warning means rapid-onset flooding is imminent or may
already be occurring. Persons along creeks, drainage ditches, and
other waterways should take immediate precautions to protect life
and property.

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

&&

LAT...LON 4177 8792 4172 8792 4171 8793 4171 8794
      4170 8794 4170 8795 4169 8797 4169 8803
      4166 8803 4172 8818 4172 8826 4181 8826

FLASH FLOOD...RADAR AND GAUGE INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL RATE...3 INCHES IN 1 HOUR

$$

RC