WGUS83 KLSX 181900
FLSLSX

Flood Advisory
National Weather Service St Louis MO
200 PM CDT Mon May 18 2026

ILC119-133-163-182200-
/O.NEW.KLSX.FA.Y.0024.260518T1900Z-260518T2200Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Madison IL-Monroe IL-Saint Clair IL-
200 PM CDT Mon May 18 2026

...FLOOD ADVISORY IN EFFECT UNTIL 5 PM CDT THIS AFTERNOON...

* WHAT...Urban area and small stream flooding caused by excessive
  rainfall is expected.

* WHERE...Southern Madison County in southwestern Illinois...
  Northwestern Monroe County in southwestern Illinois...
  Saint Clair County in southwestern Illinois...

* WHEN...Until 500 PM CDT.

* IMPACTS...Minor flooding in low-lying and poor drainage areas.
  Overflowing poor drainage areas.

* ADDITIONAL DETAILS...
  - At 200 PM CDT, Doppler radar indicated heavy rain due to
    thunderstorms. This  will cause urban and small stream flooding.
    Between 1 and 2 inches of rain have fallen.
  - Additional rainfall amounts of 1 to 2 inches are expected over
    the area. This additional rain will result in minor flooding.
  - Some locations that will experience 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.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

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


$$

Walsh