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Home Return to list Areal Flood Advisory 0024 Issued by the St. Louis Forecast Office
Action: New Issued At: 2026-05-18 14:01:22
846
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, OFallon, 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, dont 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
$$
Walsh
Action: Time Extended Issued At: 2026-05-18 16:31:56
679
WGUS83 KLSX 182131
FLSLSX
Flood Advisory
National Weather Service St Louis MO
431 PM CDT Mon May 18 2026
ILC119-133-163-182300-
/O.EXT.KLSX.FA.Y.0024.000000T0000Z-260518T2300Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Madison IL-Monroe IL-Saint Clair IL-
431 PM CDT Mon May 18 2026
...FLOOD ADVISORY NOW IN EFFECT UNTIL 6 PM CDT THIS EVENING...
* WHAT...Urban area and small stream flooding caused by excessive
rainfall continues.
* WHERE...Southern Madison County in southwestern Illinois...
Northwestern Monroe County in southwestern Illinois...
Saint Clair County in southwestern Illinois...
* WHEN...Until 600 PM CDT.
* IMPACTS...Minor flooding in low-lying and poor drainage areas.
Overflowing poor drainage areas.
* ADDITIONAL DETAILS...
- At 431 PM CDT, Doppler radar indicated heavy rain due to
thunderstorms. This will cause urban and small stream flooding.
Between 1 and 2 inches of rain have fallen.
- Additional rainfall amounts of 1 to 2 inches are expected over
the area. This additional rain will result in minor flooding.
- Some locations that will experience flooding include...
Belleville, Granite City, OFallon, East St. Louis, Collinsville,
Edwardsville, Fairview Heights, Cahokia, Swansea, Glen Carbon,
Shiloh, Highland, Troy, Waterloo, Columbia, Maryville, Mascoutah,
Pontoon Beach and Centreville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, dont drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3852 9026 3861 9018 3867 9018 3872 9021
3877 9017 3882 8960 3866 8960 3866 8971
3843 8970 3821 9035 3826 9037 3835 9036
3844 9029
$$
Walsh
Action: Cancelled Issued At: 2026-05-18 17:06:28
818
WGUS83 KLSX 182206
FLSLSX
Flood Advisory
National Weather Service St Louis MO
506 PM CDT Mon May 18 2026
ILC119-133-163-182216-
/O.CAN.KLSX.FA.Y.0024.000000T0000Z-260518T2300Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Madison IL-Monroe IL-Saint Clair IL-
506 PM CDT Mon May 18 2026
...FLOOD ADVISORY HAS BEEN REPLACED WITH A FLASH FLOOD WARNING...
The Flood Advisory is replaced by a Flash Flood Warning for a portion
of southwest Illinois, including the following areas, Madison, Monroe
and Saint Clair.
The threat of flooding continues and a Flash Flood Warning is now in
effect. Please refer to that bulletin for more information.
&&
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
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