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Home Return to list Flash Flood Warning 0017 Issued by the St. Louis Forecast Office
Action: New Issued At: 2026-05-18 14:54:53
411
WGUS53 KLSX 181954
FFWLSX
ILC005-027-051-119-121-163-189-190200-
/O.NEW.KLSX.FF.W.0017.260518T1954Z-260519T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service St Louis MO
254 PM CDT Mon May 18 2026
The National Weather Service in St Louis has issued a
* Flash Flood Warning for...
Southern Bond County in south central Illinois...
Clinton County in south central Illinois...
Southwestern Fayette County in south central Illinois...
Western Marion County in south central Illinois...
Northern Washington County in south central Illinois...
Southeastern Madison County in southwestern Illinois...
Northeastern Saint Clair County in southwestern Illinois...
* Until 900 PM CDT Monday.
* At 254 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...
Breese, New Baden, Carlyle, Trenton, Aviston, Okawville, St. Rose,
Germantown, Albers, Wamac, Beckemeyer, Pocahontas, Tamalco, Beaver
Creek, Jamestown, Boulder, Shattuc, New Memphis and Pleasant Mound.
This includes the following State Parks...
Carlyle Lake State Fish and Wildlife Area and Eldon Hazlet State
Recreation Area.
This includes Interstate 64 in Illinois near exit 34.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, dont drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3866 8971 3866 8960 3882 8960 3892 8914
3848 8914 3843 8968 3843 8970 3849 8970
FLASH FLOOD...RADAR INDICATED
$$
Walsh
Action: Continued Issued At: 2026-05-18 15:18:08
346
WGUS73 KLSX 182017
FFSLSX
Flash Flood Statement
National Weather Service St Louis MO
317 PM CDT Mon May 18 2026
ILC119-163-182027-
/O.CAN.KLSX.FF.W.0017.000000T0000Z-260519T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Madison IL-Saint Clair IL-
317 PM CDT Mon May 18 2026
...FLASH FLOOD WARNING IS CANCELLED FOR SOUTHEASTERN MADISON AND
NORTHEASTERN SAINT CLAIR COUNTIES IN SOUTHWESTERN ILLINOIS...
Flooding is no longer expected to pose a threat. Please continue to
heed remaining road closures.
A Flood Watch remains in effect until 100 PM CDT Tuesday for portions
of southwest Illinois and east central Missouri.
A Flood Watch remains in effect until 100 PM CDT Tuesday for a
portion of south central Illinois.
&&
LAT...LON 3843 8968 3843 8970 3849 8970 3859 8971
3866 8971 3866 8960 3882 8960 3892 8914
3848 8914
$$
ILC005-027-051-121-189-190200-
/O.CON.KLSX.FF.W.0017.000000T0000Z-260519T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Bond IL-Clinton IL-Fayette IL-Marion IL-Washington IL-
317 PM CDT Mon May 18 2026
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 9 PM CDT THIS EVENING
FOR SOUTHERN BOND, CLINTON, SOUTHWESTERN FAYETTE, WESTERN MARION AND
NORTHERN WASHINGTON COUNTIES IN SOUTH CENTRAL ILLINOIS...
At 317 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...
Breese, New Baden, Carlyle, Trenton, Aviston, Okawville, St. Rose,
Germantown, Albers, Wamac, Beckemeyer, Pocahontas, Tamalco, Beaver
Creek, Jamestown, Boulder, Shattuc, New Memphis and Pleasant Mound.
This includes the following State Parks...
Carlyle Lake State Fish and Wildlife Area and Eldon Hazlet State
Recreation Area.
This includes Interstate 64 in Illinois near exit 34.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, dont drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3843 8968 3843 8970 3849 8970 3859 8971
3866 8971 3866 8960 3882 8960 3892 8914
3848 8914
FLASH FLOOD...RADAR INDICATED
$$
Walsh
Action: Cancelled Issued At: 2026-05-18 15:18:08
346
WGUS73 KLSX 182017
FFSLSX
Flash Flood Statement
National Weather Service St Louis MO
317 PM CDT Mon May 18 2026
ILC119-163-182027-
/O.CAN.KLSX.FF.W.0017.000000T0000Z-260519T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Madison IL-Saint Clair IL-
317 PM CDT Mon May 18 2026
...FLASH FLOOD WARNING IS CANCELLED FOR SOUTHEASTERN MADISON AND
NORTHEASTERN SAINT CLAIR COUNTIES IN SOUTHWESTERN ILLINOIS...
Flooding is no longer expected to pose a threat. Please continue to
heed remaining road closures.
A Flood Watch remains in effect until 100 PM CDT Tuesday for portions
of southwest Illinois and east central Missouri.
A Flood Watch remains in effect until 100 PM CDT Tuesday for a
portion of south central Illinois.
&&
LAT...LON 3843 8968 3843 8970 3849 8970 3859 8971
3866 8971 3866 8960 3882 8960 3892 8914
3848 8914
$$
ILC005-027-051-121-189-190200-
/O.CON.KLSX.FF.W.0017.000000T0000Z-260519T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Bond IL-Clinton IL-Fayette IL-Marion IL-Washington IL-
317 PM CDT Mon May 18 2026
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 9 PM CDT THIS EVENING
FOR SOUTHERN BOND, CLINTON, SOUTHWESTERN FAYETTE, WESTERN MARION AND
NORTHERN WASHINGTON COUNTIES IN SOUTH CENTRAL ILLINOIS...
At 317 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...
Breese, New Baden, Carlyle, Trenton, Aviston, Okawville, St. Rose,
Germantown, Albers, Wamac, Beckemeyer, Pocahontas, Tamalco, Beaver
Creek, Jamestown, Boulder, Shattuc, New Memphis and Pleasant Mound.
This includes the following State Parks...
Carlyle Lake State Fish and Wildlife Area and Eldon Hazlet State
Recreation Area.
This includes Interstate 64 in Illinois near exit 34.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, dont drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3843 8968 3843 8970 3849 8970 3859 8971
3866 8971 3866 8960 3882 8960 3892 8914
3848 8914
FLASH FLOOD...RADAR INDICATED
$$
Walsh
Action: Expired Issued At: 2026-05-18 20:58:36
950
WGUS73 KLSX 190158
FFSLSX
Flash Flood Statement
National Weather Service St Louis MO
858 PM CDT Mon May 18 2026
ILC005-027-051-121-189-190208-
/O.EXP.KLSX.FF.W.0017.000000T0000Z-260519T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Bond IL-Clinton IL-Fayette IL-Marion IL-Washington IL-
858 PM CDT Mon May 18 2026
...FLASH FLOOD WARNING WILL EXPIRE AT 9 PM CDT THIS EVENING FOR
SOUTHERN BOND, CLINTON, SOUTHWESTERN FAYETTE, WESTERN MARION AND
NORTHERN WASHINGTON COUNTIES IN SOUTH CENTRAL ILLINOIS...
The heavy rain has ended. Minor flooding may continue to linger for
the next few hours, especially in flood prone areas. Please continue
to heed remaining road closures.
A Flood Watch remains in effect until 100 PM CDT Tuesday for portions
of southwest Illinois and east central Missouri.
A Flood Watch remains in effect until 100 PM CDT Tuesday for a
portion of south central Illinois.
&&
LAT...LON 3843 8968 3843 8970 3849 8970 3859 8971
3866 8971 3866 8960 3882 8960 3892 8914
3848 8914
$$
Maples
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