Flash Flood Warning 34, NWS Chicago, IL

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Hazardous Weather Outlook...UPDATED
National Weather Service Chicago/Romeoville IL
936 PM CDT Mon Aug 18 2025

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-200245-
Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-De Kalb-Kane-DuPage-
La Salle-Kendall-Grundy-Kankakee-Livingston-Iroquois-Ford-
Northern Cook-Central Cook-Southern Cook-Northern Will-
Southern Will-Eastern Will-Lake IN-Porter-Newton-Jasper-Benton-
936 PM CDT Mon Aug 18 2025 /1036 PM EDT Mon Aug 18 2025/

This Hazardous Weather Outlook is for portions of north central
Illinois...northeast Illinois and northwest Indiana.

.DAY ONE...Tonight.

Weather hazards expected...

  Elevated Thunderstorm Risk...with an associated:
     Level 1 of 5 Damaging Wind Risk...up to 60 mph.
  Elevated Flooding Risk.

DISCUSSION...

Scattered thunderstorms will continue tonight, mainly along and
south of Interstate 80, where an isolated strong to severe
thunderstorm is possible.

Very heavy rain is expected with these thunderstorms, which may
lead to additional localized flash flooding, especially in urban
areas.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

Tuesday...
  Limited Flooding Risk.
  Limited Thunderstorm Risk.
Wednesday...
  High Swim Risk at Lake Michigan Beaches.

.SPOTTER INFORMATION STATEMENT...

Spotter reports of flooding will be appreciated.

GENERAL STORM MOTION OF THE DAY:

Moving toward the east at 20 to 30 mph.

LMZ740>745-200245-
Winthrop Harbor to Wilmette Harbor IL-
Wilmette Harbor to Northerly Island IL-
Northerly Island to Calumet Harbor IL-
Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN-
Burns Harbor to Michigan City IN-
936 PM CDT Mon Aug 18 2025

This Hazardous Weather Outlook is for portions of the Illinois
nearshore waters of Lake Michigan and the Indiana nearshore
waters of Lake Michigan.

.DAY ONE...Tonight.

Weather hazards expected...

  Elevated Thunderstorm Risk...with an associated:
     Level 1 of 5 Thunderstorm Wind Gust Risk...up to 40 knots.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

Tuesday...
  Hazardous conditions for small craft are likely.
  Limited Thunderstorm Risk.
Wednesday...
  Hazardous conditions for small craft are likely.

Visit us at www.weather.gov/chicago

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Preliminary Local Storm Report
National Weather Service Chicago IL
1212 AM CDT Tue Aug 19 2025

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1211 AM     Rain             2 ENE Ingalls Park      41.54N 88.00W
08/19/2025  M1.08 Inch       Will               IL   Mesonet

            1.08 inches of rain in 15 minutes. Personal
            weather station KILNEWLE66.

&&

Special Weather Statement
National Weather Service Chicago/Romeoville
1215 AM CDT Tue Aug 19 2025

ILZ105-190530-
Southern Cook IL-
1215 AM CDT Tue Aug 19 2025

...STRONG THUNDERSTORMS WILL IMPACT SOUTHEASTERN COOK COUNTY THROUGH
1230 AM CDT...

At 1215 AM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from Crestwood to near Frankfort Square. Movement
was east at 30 mph.

HAZARD...Wind gusts up to 50 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Strong thunderstorms will be near...
  Homewood, Park Forest, Dixmoor, Riverdale, Blue Island, Richton
  Park, Chicago Heights, Crestwood, Hazel Crest, and Tinley Park
  around 1220 AM CDT.

Other locations impacted by these storms include East Hazel Crest,
Robbins, South Chicago Heights, Calumet Park, and West Pullman.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4149 8762 4148 8779 4156 8779 4166 8777
      4166 8775 4165 8773 4165 8768 4166 8765
      4166 8762 4164 8762 4164 8759
TIME...MOT...LOC 0515Z 266DEG 25KT 4165 8775 4149 8779

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH

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Special Weather Statement
National Weather Service Chicago/Romeoville
1230 AM CDT Tue Aug 19 2025

ILZ104>106-108-190600-
Eastern Will IL-Southern Cook IL-Central Cook IL-Northern Will IL-
1230 AM CDT Tue Aug 19 2025

...STRONG THUNDERSTORMS WILL IMPACT EAST CENTRAL WILL AND
SOUTHEASTERN COOK COUNTIES THROUGH 100 AM CDT...

At 1229 AM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from Merrionette Park to near Manhattan. Movement
was east at 25 mph.

HAZARD...Wind gusts up to 50 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Strong thunderstorms will be near...
  Homewood, Park Forest, Dixmoor, Riverdale, Blue Island, Richton
  Park, Alsip, Crestwood, Hazel Crest, and Tinley Park around 1235
  AM CDT.
  Chicago Heights, Calumet City, Thornton, and Glenwood around 1240
  AM CDT.
  Hammond and Lansing around 1245 AM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 4141 8753 4141 8790 4143 8790 4171 8772
      4175 8753 4174 8754 4174 8752 4173 8752
TIME...MOT...LOC 0529Z 263DEG 20KT 4168 8769 4143 8789

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH

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