WGUS53 KLSX 182206
FFWLSX
ILC027-119-133-163-MOC099-189-510-190200-
/O.NEW.KLSX.FF.W.0020.260518T2206Z-260519T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service St Louis MO
506 PM CDT Mon May 18 2026

The National Weather Service in St Louis has issued a

* Flash Flood Warning for...
  Western Clinton County in south central Illinois...
  Southern Madison County in southwestern Illinois...
  Northwestern Monroe County in southwestern Illinois...
  Saint Clair County in southwestern Illinois...
  Northeastern Jefferson County in east central Missouri...
  Eastern Saint Louis County in east central Missouri...
  East Central Saint Louis City in east central Missouri...

* Until 900 PM CDT.

* At 506 PM CDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Between 1 and 2 inches of rain
  have fallen. Additional rainfall amounts of 1 to 2 inches are
  possible in the warned area. Flash flooding is ongoing or expected
  to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar indicated.

  IMPACT...Flash flooding of small creeks and streams, urban areas,
           highways, streets and underpasses as well as other poor
           drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Belleville, Granite City, O'Fallon, East St. Louis, Collinsville,
  Edwardsville, Fairview Heights, Cahokia, Swansea, Glen Carbon,
  Shiloh, Highland, Troy, Waterloo, Columbia, Maryville, Mascoutah,
  Pontoon Beach and Centreville.

This includes the following State Parks...
Frank Holten State Park and Horseshoe Lake State Park.

This includes the following highways...
Interstate 64 in Illinois between exits 9 and 27. Interstate 70 in
Illinois between exits 21 and 30.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3826 9037 3835 9036 3844 9029 3852 9026
      3861 9018 3867 9018 3872 9021 3877 9017
      3882 8960 3866 8960 3866 8971 3843 8970
      3821 9035

FLASH FLOOD...RADAR INDICATED

$$

Walsh