River Flood Warning 39, NWS St. Louis, MO

008 
WGUS83 KLSX 280341
FLSLSX

Flood Statement
National Weather Service St Louis MO
1041 PM CDT Mon Apr 27 2026

...The Flood Warning is extended for the following rivers in
Illinois...Missouri...

  Illinois River at Valley City.

  Mississippi River at Grafton.

  Mississippi River at Saverton.

  Mississippi River at Chester.

  Meramec River near Arnold.

...The Flood Warning continues for the following rivers in
Illinois...Missouri...

  Mississippi River at Canton.

  Mississippi River at Clarksville.

  Mississippi River at Louisiana.

  Kaskaskia River at Vandalia.

  Missouri River near Chamois.

  Missouri River at Hermann.

  Mississippi River at Lock & Dam 21.

  Illinois River at Hardin.

  Mississippi River at Winfield.

  Mississippi River at Hannibal.

  Mississippi River at Quincy.

River forecasts are based on observed precipitation and forecast
precipitation for the next 24 hours.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Motorists should not attempt to drive around barricades or drive cars
through flooded areas.

Rainfall heavier than forecast could cause river levels to rise even
higher than predicted. The National Weather Service will monitor this
developing situation and issue follow up statements as conditions
change.

This product, along with additional weather and stream information,
is available at https://water.noaa.gov/wfo/lsx

&&

ILC149-171-291545-
/O.EXT.KLSX.FL.W.0041.260428T0341Z-000000T0000Z/
/VALI2.1.ER.260428T0056Z.260502T0000Z.000000T0000Z.NO/
1041 PM CDT Mon Apr 27 2026

...FLOOD WARNING NOW IN EFFECT FROM THIS EVENING UNTIL FURTHER
NOTICE...

* WHAT...Minor flooding is occurring and minor flooding is forecast.

* WHERE...Illinois River at Valley City.

* WHEN...From this evening until further notice.

* IMPACTS...At 14.0 feet, The road to Norbut Fish and Wildlife area
  is flooded.

* ADDITIONAL DETAILS...
  - At 10:30 PM CDT Monday the stage was 14.3 feet.
  - Recent Activity...The maximum river stage in the 24 hours ending
    at 10:30 PM CDT Monday was 14.3 feet.
  - Forecast...The river will fall to 14.2 feet just after midnight
    tonight. It will then rise to 14.3 feet early tomorrow afternoon.
    It will fall to 14.1 feet Wednesday evening. It will then rise to
    14.9 feet Saturday evening. It will fall again but remain above
    flood stage.
  - Flood stage is 14.0 feet.



&&


All Times CDT Fld   Observed  Forecasts (7:00 am)
Location      Stg     Stage   Wed   Thu   Fri   Sat   Sun

Illinois River
 Valley City  14.0    14.3    14.1  14.3  14.8  14.9  14.8



&&

LAT...LON 3977 9067 3977 9053 3969 9056 3962 9052
      3952 9051 3952 9059 3964 9062 3965 9066
      3967 9065


$$

ILC083-MOC183-291545-
/O.EXT.KLSX.FL.W.0034.000000T0000Z-260505T1500Z/
/GRFI2.1.ER.260420T0010Z.260430T0600Z.260504T0900Z.NO/
1041 PM CDT Mon Apr 27 2026

...FLOOD WARNING NOW IN EFFECT UNTIL TUESDAY, MAY 05...

* WHAT...Minor flooding is occurring and minor flooding is forecast.

* WHERE...Mississippi River at Grafton.

* WHEN...Until Tuesday, May 05.

* IMPACTS...At 22.5 feet, East end of Main Street in Portage des
  Sioux begins flooding near this height.

* ADDITIONAL DETAILS...
  - At 10:30 PM CDT Monday the stage was 21.0 feet.
  - Recent Activity...The maximum river stage in the 24 hours ending
    at 10:30 PM CDT Monday was 21.0 feet.
  - Forecast...The river is expected to rise to a crest of 22.4 feet
    early Thursday morning. It will then fall below flood stage
    Monday, May 04.
  - Flood stage is 20.0 feet.



&&


All Times CDT    Fld   Observed  Forecasts (7:00 am)
Location         Stg     Stage   Wed   Thu   Fri   Sat   Sun

Mississippi River
 Grafton         20.0    21.0    21.9  22.4  22.1  21.4  20.7



&&

LAT...LON 3880 9057 3888 9057 3897 9055 3898 9042
      3895 9028 3891 9033


$$

ILC001-MOC111-291545-
/O.EXT.KLSX.FL.W.0026.000000T0000Z-260502T2100Z/
/CANM7.1.ER.260418T0926Z.260428T1200Z.260501T1500Z.NO/
1041 PM CDT Mon Apr 27 2026

...FLOOD WARNING NOW IN EFFECT UNTIL SATURDAY AFTERNOON...

* WHAT...Minor flooding is occurring and minor flooding is forecast.

* WHERE...Mississippi River at Canton.

* WHEN...Until Saturday afternoon.

* IMPACTS...At 16.6 feet, Front Street leading to the campground and
  Corps park campgrounds flood at this height.

* ADDITIONAL DETAILS...
  - At 8:00 PM CDT Monday the stage was 15.9 feet.
  - Recent Activity...The maximum river stage in the 24 hours ending
    at 8:00 PM CDT Monday was 15.9 feet.
  - Forecast...The river is expected to rise to a crest of 16.1 feet
    tomorrow morning. It will then fall below flood stage late Friday
    morning.
  - Flood stage is 15.0 feet.



&&


All Times CDT    Fld   Observed  Forecasts (7:00 am)
Location         Stg     Stage   Wed   Thu   Fri   Sat   Sun

Mississippi River
 Canton          15.0    15.9    16.0  15.6  15.1  14.4  13.7



&&

LAT...LON 4022 9154 4022 9142 4008 9139 4008 9153


$$

ILC149-MOC173-291545-
/O.EXT.KLSX.FL.W.0024.000000T0000Z-260504T1000Z/
/SVRM7.1.ER.260415T0220Z.260429T0600Z.260503T0400Z.NO/
1041 PM CDT Mon Apr 27 2026

...FLOOD WARNING NOW IN EFFECT UNTIL LATE SUNDAY NIGHT...

* WHAT...Minor flooding is occurring and minor flooding is forecast.

* WHERE...Mississippi River at Saverton.

* WHEN...Until late Sunday night.

* ADDITIONAL DETAILS...
  - At 10:00 PM CDT Monday the stage was 18.0 feet.
  - Recent Activity...The maximum river stage in the 24 hours ending
    at 10:00 PM CDT Monday was 18.0 feet.
  - Forecast...The river is expected to rise to a crest of 18.8 feet
    early Wednesday morning. It will then fall below flood stage late
    Saturday evening.
  - Flood stage is 16.0 feet.



&&


All Times CDT    Fld   Observed  Forecasts (7:00 am)
Location         Stg     Stage   Wed   Thu   Fri   Sat   Sun

Mississippi River
 Saverton        16.0    18.0    18.8  18.2  17.5  16.6  15.7



&&

LAT...LON 3967 9132 3974 9121 3970 9114 3953 9099
      3946 9110 3960 9122


$$

ILC013-MOC163-291545-
/O.EXT.KLSX.FL.W.0021.000000T0000Z-260505T1600Z/
/CLKM7.1.ER.260409T1800Z.260429T1200Z.260504T1000Z.NO/
1041 PM CDT Mon Apr 27 2026

...FLOOD WARNING NOW IN EFFECT UNTIL TUESDAY, MAY 05...

* WHAT...Minor flooding is occurring and minor flooding is forecast.

* WHERE...Mississippi River at Clarksville.

* WHEN...Until Tuesday, May 05.

* IMPACTS...At 30.0 feet, East bank (Illinois side) begins to flood.

* ADDITIONAL DETAILS...
  - At 10:30 PM CDT Monday the stage was 28.7 feet.
  - Recent Activity...The maximum river stage in the 24 hours ending
    at 10:30 PM CDT Monday was 28.7 feet.
  - Forecast...The river is expected to rise to a crest of 29.6 feet
    Wednesday morning. It will then fall below flood stage Monday,
    May 04.
  - Flood stage is 25.0 feet.



&&


All Times CDT    Fld   Observed  Forecasts (7:00 am)
Location         Stg     Stage   Wed   Thu   Fri   Sat   Sun

Mississippi River
 Clarksville     25.0    28.7    29.6  29.0  28.0  26.9  25.9



&&

LAT...LON 3939 9097 3946 9088 3940 9081 3932 9075
      3925 9071 3925 9083 3930 9090 3932 9088
      3936 9092 3935 9095


$$

ILC149-MOC163-291545-
/O.EXT.KLSX.FL.W.0020.000000T0000Z-260505T2100Z/
/LUSM7.1.ER.260409T1626Z.260429T0600Z.260504T1500Z.NO/
1041 PM CDT Mon Apr 27 2026

...FLOOD WARNING NOW IN EFFECT UNTIL TUESDAY, MAY 05...

* WHAT...Minor flooding is occurring and minor flooding is forecast.

* WHERE...Mississippi River at Louisiana.

* WHEN...Until Tuesday, May 05.

* IMPACTS...At 19.6 feet, Maryland Street at 4th Street by the Town
  Branch bridge begins flooding near this height.

* ADDITIONAL DETAILS...
  - At 10:30 PM CDT Monday the stage was 18.4 feet.
  - Recent Activity...The maximum river stage in the 24 hours ending
    at 10:30 PM CDT Monday was 18.4 feet.
  - Forecast...The river is expected to rise to a crest of 19.2 feet
    early Wednesday morning. It will then fall below flood stage
    Monday, May 04.
  - Flood stage is 15.0 feet.



&&


All Times CDT    Fld   Observed  Forecasts (7:00 am)
Location         Stg     Stage   Wed   Thu   Fri   Sat   Sun

Mississippi River
 Louisiana       15.0    18.4    19.2  18.6  17.8  16.8  15.9



&&

LAT...LON 3946 9110 3953 9099 3946 9088 3939 9097
      3941 9100 3939 9103


$$

ILC051-291545-
/O.EXT.KLSX.FL.W.0042.260428T0527Z-260502T1800Z/
/VNDI2.3.ER.260428T0527Z.260429T1800Z.260501T1200Z.NO/
1041 PM CDT Mon Apr 27 2026

...FLOOD WARNING NOW IN EFFECT UNTIL SATURDAY AFTERNOON...

* WHAT...Major flooding is forecast.

* WHERE...Kaskaskia River at Vandalia.

* WHEN...Until Saturday afternoon.

* IMPACTS...At 26.0 feet, The Dively and Vandalia Levees begin to be
  overtopped.

* ADDITIONAL DETAILS...
  - At 10:00 PM CDT Monday the stage was 16.6 feet.
  - Forecast...The river is expected to rise above flood stage just
    after midnight tonight to a crest of 26.0 feet early Wednesday
    afternoon. It will then fall below flood stage Friday morning.
  - Flood stage is 18.0 feet.
  - Flood History...This crest compares to a previous crest of 26.0
    feet on 04/21/1970.



&&


All Times CDT  Fld   Observed  Forecasts (7:00 am)
Location       Stg     Stage   Wed   Thu   Fri   Sat   Sun

Kaskaskia River
 Vandalia      18.0    16.6    25.7  24.6  18.0  10.2  7.4



&&

LAT...LON 3903 8910 3903 8906 3889 8908 3881 8916
      3883 8922


$$

MOC027-151-291545-
/O.EXT.KLSX.FL.W.0047.260429T0000Z-260503T0508Z/
/CMSM7.1.ER.260429T0000Z.260430T1200Z.260501T1708Z.NO/
1041 PM CDT Mon Apr 27 2026

...FLOOD WARNING NOW IN EFFECT FROM TUESDAY EVENING TO LATE SATURDAY
NIGHT...

* WHAT...Minor flooding is forecast.

* WHERE...Missouri River near Chamois.

* WHEN...From Tuesday evening to late Saturday night.

* ADDITIONAL DETAILS...
  - There is no current observed data.
  - Forecast...The river is expected to rise above flood stage
    tomorrow evening to a crest of 19.4 feet Thursday morning. It
    will then fall below flood stage early Friday afternoon.
  - Flood stage is 17.0 feet.



&&


All Times CDT Fld   Observed  Forecasts (7:00 am)
Location      Stg     Stage   Wed   Thu   Fri   Sat   Sun

Missouri River
 Chamois      17.0    MSG     18.0  19.4  17.6  14.5  MSG



&&

LAT...LON 3864 9198 3871 9185 3873 9160 3865 9160
      3864 9181 3858 9194


$$

ILC077-157-MOC157-186-291545-
/O.EXT.KLSX.FL.W.0040.260429T0215Z-000000T0000Z/
/CHSI2.1.ER.260429T0215Z.260502T1200Z.000000T0000Z.NO/
1041 PM CDT Mon Apr 27 2026

...FLOOD WARNING NOW IN EFFECT FROM TUESDAY EVENING UNTIL FURTHER
NOTICE...

* WHAT...Minor flooding is forecast.

* WHERE...Mississippi River at Chester.

* WHEN...From Tuesday evening until further notice.

* IMPACTS...At 34.7 feet, The north parking lot at Menard
  Correctional Center begins flooding.

* ADDITIONAL DETAILS...
  - At 10:30 PM CDT Monday the stage was 25.1 feet.
  - Forecast...The river is expected to rise above flood stage late
    tomorrow evening and continue rising to a crest of 34.2 feet
    Saturday morning.
  - Flood stage is 27.0 feet.



&&


All Times CDT    Fld   Observed  Forecasts (7:00 am)
Location         Stg     Stage   Wed   Thu   Fri   Sat   Sun

Mississippi River
 Chester         27.0    25.1    28.3  30.9  33.0  34.2  33.4



&&

LAT...LON 3799 8992 3790 8977 3786 8973 3776 8945
      3769 8941 3769 8959 3786 8995 3795 9005


$$

MOC073-139-291545-
/O.EXT.KLSX.FL.W.0048.260429T0234Z-260502T2125Z/
/HRNM7.1.ER.260429T0234Z.260430T1200Z.260501T1525Z.NO/
1041 PM CDT Mon Apr 27 2026

...FLOOD WARNING NOW IN EFFECT FROM TUESDAY EVENING TO SATURDAY
AFTERNOON...

* WHAT...Minor flooding is forecast.

* WHERE...Missouri River at Hermann.

* WHEN...From Tuesday evening to Saturday afternoon.

* IMPACTS...At 22.3 feet, Southern portions of Old Rock Road and
  Twisters Road south of Rhineland begin flooding near this height.

* ADDITIONAL DETAILS...
  - At 9:30 PM CDT Monday the stage was 15.8 feet.
  - Forecast...The river is expected to rise above flood stage late
    tomorrow evening to a crest of 22.9 feet Thursday morning. It
    will then fall below flood stage late Friday morning.
  - Flood stage is 21.0 feet.



&&


All Times CDT Fld   Observed  Forecasts (7:00 am)
Location      Stg     Stage   Wed   Thu   Fri   Sat   Sun

Missouri River
 Hermann      21.0    15.8    21.8  22.9  21.4  18.1  14.6



&&

LAT...LON 3873 9160 3875 9136 3866 9119 3859 9119
      3867 9144 3865 9160


$$

MOC099-189-291545-
/O.EXT.KLSX.FL.W.0039.260429T1115Z-000000T0000Z/
/ARNM7.1.ER.260429T1115Z.260502T0000Z.000000T0000Z.NO/
1041 PM CDT Mon Apr 27 2026

...FLOOD WARNING NOW IN EFFECT FROM WEDNESDAY MORNING UNTIL FURTHER
NOTICE...

* WHAT...Minor flooding is forecast.

* WHERE...Meramec River near Arnold.

* WHEN...From Wednesday morning until further notice.

* IMPACTS...At 30.0 feet, Wells Road below Suson Woods begins
  flooding at this height.

* ADDITIONAL DETAILS...
  - At 10:00 PM CDT Monday the stage was 20.9 feet.
  - Forecast...The river is expected to rise above flood stage
    Wednesday morning and continue rising to a crest of 29.0 feet
    Friday evening.
  - Flood stage is 24.0 feet.



&&


All Times CDT Fld   Observed  Forecasts (7:00 am)
Location      Stg     Stage   Wed   Thu   Fri   Sat   Sun

Meramec River
 Arnold       24.0    20.9    24.1  27.1  28.6  28.8  26.5



&&

LAT...LON 3847 9044 3847 9032 3840 9033 3837 9036
      3841 9036 3842 9037 3843 9036 3845 9036
      3845 9041


$$

ILC001-MOC127-291545-
/O.CON.KLSX.FL.W.0050.000000T0000Z-260501T0000Z/
/QLDI2.1.ER.260428T0125Z.260428T1200Z.260429T1800Z.NO/
1041 PM CDT Mon Apr 27 2026

...FLOOD WARNING REMAINS IN EFFECT UNTIL THURSDAY EVENING...

* WHAT...Minor flooding is occurring and minor flooding is forecast.

* WHERE...Mississippi River at Lock & Dam 21.

* WHEN...Until Thursday evening.

* ADDITIONAL DETAILS...
  - At 10:00 PM CDT Monday the stage was 18.2 feet.
  - Recent Activity...The maximum river stage in the 24 hours ending
    at 10:00 PM CDT Monday was 18.2 feet.
  - Forecast...The river is expected to rise to a crest of 18.5 feet
    tomorrow morning. It will then fall below flood stage early
    Wednesday afternoon.
  - Flood stage is 18.0 feet.



&&


All Times CDT    Fld   Observed  Forecasts (7:00 am)
Location         Stg     Stage   Wed   Thu   Fri   Sat   Sun

Mississippi River
 Lock & Dam 21   18.0    18.2    18.1  17.5  16.8  15.8  15.2



&&

LAT...LON 3991 9153 3991 9140 3983 9135 3983 9148


$$

ILC013-061-083-291545-
/O.CON.KLSX.FL.W.0025.000000T0000Z-000000T0000Z/
/HARI2.1.ER.260418T2200Z.260501T0600Z.000000T0000Z.NO/
1041 PM CDT Mon Apr 27 2026

...FLOOD WARNING REMAINS IN EFFECT UNTIL FURTHER NOTICE...

* WHAT...Minor flooding is occurring and minor flooding is forecast.

* WHERE...Illinois River at Hardin.

* WHEN...Until further notice.

* ADDITIONAL DETAILS...
  - At 10:30 PM CDT Monday the stage was 26.9 feet.
  - Recent Activity...The maximum river stage in the 24 hours ending
    at 10:30 PM CDT Monday was 26.9 feet.
  - Forecast...The river is expected to rise to a crest of 27.4 feet
    early Friday morning.
  - Flood stage is 25.0 feet.



&&


All Times CDT Fld   Observed  Forecasts (7:00 am)
Location      Stg     Stage   Wed   Thu   Fri   Sat   Sun

Illinois River
 Hardin       25.0    26.9    26.9  27.2  27.4  27.4  27.2



&&

LAT...LON 3952 9064 3952 9052 3942 9054 3935 9051
      3931 9053 3898 9052 3897 9049 3890 9054
      3898 9062 3923 9065


$$

ILC013-MOC113-291545-
/O.CON.KLSX.FL.W.0023.000000T0000Z-260505T1800Z/
/CAGM7.1.ER.260415T1236Z.260430T0000Z.260504T1200Z.NO/
1041 PM CDT Mon Apr 27 2026

...FLOOD WARNING REMAINS IN EFFECT UNTIL TUESDAY, MAY 05...

* WHAT...Minor flooding is occurring and minor flooding is forecast.

* WHERE...Mississippi River at Winfield.

* WHEN...Until Tuesday, May 05.

* IMPACTS...At 29.5 feet, Highway B in eastern St. Charles County
  floods near the Dardenne Creek bridge.

* ADDITIONAL DETAILS...
  - At 10:30 PM CDT Monday the stage was 28.7 feet.
  - Recent Activity...The maximum river stage in the 24 hours ending
    at 10:30 PM CDT Monday was 28.7 feet.
  - Forecast...The river is expected to rise to a crest of 29.6 feet
    Wednesday evening. It will then fall below flood stage Monday,
    May 04.
  - Flood stage is 26.0 feet.



&&


All Times CDT    Fld   Observed  Forecasts (7:00 am)
Location         Stg     Stage   Wed   Thu   Fri   Sat   Sun

Mississippi River
 Winfield        26.0    28.7    29.4  29.6  29.0  28.0  27.0



&&

LAT...LON 3925 9083 3925 9071 3912 9065 3896 9065
      3888 9057 3880 9057 3885 9073 3910 9076


$$

ILC149-MOC127-291545-
/O.CON.KLSX.FL.W.0022.000000T0000Z-260505T0000Z/
/HNNM7.1.ER.260413T1415Z.260429T0000Z.260503T1800Z.NO/
1041 PM CDT Mon Apr 27 2026

...FLOOD WARNING REMAINS IN EFFECT UNTIL MONDAY EVENING...

* WHAT...Minor flooding is occurring and minor flooding is forecast.

* WHERE...Mississippi River at Hannibal.

* WHEN...Until Monday evening.

* IMPACTS...At 20.2 feet, Nipper Park begins flooding on the Hannibal
  riverfront.

* ADDITIONAL DETAILS...
  - At 10:15 PM CDT Monday the stage was 19.6 feet.
  - Recent Activity...The maximum river stage in the 24 hours ending
    at 10:15 PM CDT Monday was 19.6 feet.
  - Forecast...The river is expected to rise to a crest of 20.1 feet
    tomorrow evening. It will then fall below flood stage early
    Sunday afternoon.
  - Flood stage is 17.0 feet.



&&


All Times CDT    Fld   Observed  Forecasts (7:00 am)
Location         Stg     Stage   Wed   Thu   Fri   Sat   Sun

Mississippi River
 Hannibal        17.0    19.6    20.1  19.5  18.7  17.9  17.2



&&

LAT...LON 3983 9148 3983 9135 3974 9121 3967 9132
      3969 9134 3968 9139 3971 9136


$$

ILC001-MOC127-291545-
/O.CON.KLSX.FL.W.0051.260428T1800Z-260430T1200Z/
/UINI2.1.ER.260428T1800Z.260428T1800Z.260429T0600Z.NO/
1041 PM CDT Mon Apr 27 2026

...FLOOD WARNING REMAINS IN EFFECT FROM TUESDAY AFTERNOON TO THURSDAY
MORNING...

* WHAT...Minor flooding is forecast.

* WHERE...Mississippi River at Quincy.

* WHEN...From Tuesday afternoon to Thursday morning.

* IMPACTS...At 18.5 feet, BNSF Railroad main line, 10 to 16 miles
  above Quincy begins to flood at several locations.

* ADDITIONAL DETAILS...
  - At 9:15 PM CDT Monday the stage was 18.7 feet.
  - Forecast...The river is expected to rise to a crest of 19.0 feet
    early tomorrow afternoon. It will then fall below flood stage
    early Wednesday morning.
  - Flood stage is 19.0 feet.



&&


All Times CDT    Fld   Observed  Forecasts (7:00 am)
Location         Stg     Stage   Wed   Thu   Fri   Sat   Sun

Mississippi River
 Quincy          19.0    18.7    18.9  18.6  17.9  16.9  16.4



&&

LAT...LON 3999 9153 3999 9140 3991 9140 3991 9153


$$

Elmore

583 
WGUS83 KLSX 282134
FLSLSX

Flood Statement
National Weather Service St Louis MO
434 PM CDT Tue Apr 28 2026

...The Flood Warning continues for the following rivers in
Missouri...

  Meramec River near Arnold.

River forecasts are based on observed precipitation and forecast
precipitation for the next 24 hours.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Rainfall heavier than forecast could cause river levels to rise even
higher than predicted. The National Weather Service will monitor this
developing situation and issue follow up statements as conditions
change.

This product, along with additional weather and stream information,
is available at https://water.noaa.gov/wfo/lsx

&&

MOC099-189-300945-
/O.EXT.KLSX.FL.W.0039.260429T0815Z-260505T2308Z/
/ARNM7.1.ER.260429T0815Z.260502T0600Z.260504T1708Z.NO/
434 PM CDT Tue Apr 28 2026

...FLOOD WARNING NOW IN EFFECT FROM LATE TONIGHT TO TUESDAY
EVENING...

* WHAT...Minor flooding is forecast.

* WHERE...Meramec River near Arnold.

* WHEN...From late tonight to Tuesday evening.

* IMPACTS...At 27.0 feet, Meramec Bottom Road between Wells Road and
  Kerth Road begins flooding near this height.

* ADDITIONAL DETAILS...
  - At 4:00 PM CDT Tuesday the stage was 22.8 feet.
  - Forecast...The river is expected to rise above flood stage late
    tonight to a crest of 29.4 feet early Saturday morning. It will
    then fall below flood stage early Monday afternoon.
  - Flood stage is 24.0 feet.



&&


All Times CDT Fld   Observed  Forecasts (7:00 am)
Location      Stg     Stage   Wed   Thu   Fri   Sat   Sun

Meramec River
 Arnold       24.0    22.8    24.5  27.5  28.8  29.3  27.3



&&

LAT...LON 3847 9044 3847 9032 3840 9033 3837 9036
      3841 9036 3842 9037 3843 9036 3845 9036
      3845 9041


$$

Fuchs

517 
WGUS83 KLSX 290152
FLSLSX

Flood Statement
National Weather Service St Louis MO
852 PM CDT Tue Apr 28 2026

...The Flood Warning continues for the following rivers in
Missouri...

  Meramec River near Arnold.

...The Flood Warning is cancelled for the following rivers in
Missouri...

  Moreau River near Jefferson City.

River forecasts are based on observed precipitation and forecast
precipitation for the next 24 hours.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

This product, along with additional weather and stream information,
is available at https://water.noaa.gov/wfo/lsx

&&

MOC051-290300-
/O.CAN.KLSX.FL.W.0052.000000T0000Z-260429T0152Z/
/JCMM7.1.ER.260428T0839Z.260428T2045Z.260429T0113Z.NO/
852 PM CDT Tue Apr 28 2026

...FLOOD WARNING IS CANCELLED...

The Flood Warning is cancelled for
  the Moreau River near Jefferson City.

* ADDITIONAL DETAILS...
  - At 8:30 PM CDT Tuesday the stage was 16.7 feet.
  - Forecast...The river is expected to fall to 2.2 feet Sunday
    evening.



&&


All Times CDT  Fld   Observed  Forecasts (7:00 am)
Location       Stg     Stage   Thu   Fri   Sat   Sun   Mon

Moreau River
 Jefferson Cit 17.0    16.7    3.9   2.2   2.3   2.2   MSG



&&

LAT...LON 3855 9214 3854 9207 3850 9210 3847 9224
      3850 9235 3856 9236 3857 9233 3854 9226


$$

MOC099-189-301400-
/O.EXT.KLSX.FL.W.0039.260429T0730Z-260505T1930Z/
/ARNM7.1.ER.260429T0730Z.260502T0000Z.260504T1330Z.NO/
852 PM CDT Tue Apr 28 2026

...FLOOD WARNING NOW IN EFFECT FROM LATE TONIGHT TO TUESDAY
AFTERNOON...

* WHAT...Minor flooding is forecast.

* WHERE...Meramec River near Arnold.

* WHEN...From late tonight to Tuesday afternoon.

* IMPACTS...At 27.0 feet, Meramec Bottom Road between Wells Road and
  Kerth Road begins flooding near this height.

* ADDITIONAL DETAILS...
  - At 8:30 PM CDT Tuesday the stage was 23.3 feet.
  - Forecast...The river is expected to rise above flood stage just
    after midnight tonight to a crest of 29.1 feet Friday evening. It
    will then fall below flood stage Monday morning.
  - Flood stage is 24.0 feet.



&&


All Times CDT Fld   Observed  Forecasts (7:00 am)
Location      Stg     Stage   Thu   Fri   Sat   Sun   Mon

Meramec River
 Arnold       24.0    23.3    27.6  28.8  29.0  27.0  24.2



&&

LAT...LON 3847 9044 3847 9032 3840 9033 3837 9036
      3841 9036 3842 9037 3843 9036 3845 9036
      3845 9041


$$

Jaja

850 
WGUS83 KLSX 291703
FLSLSX

Flood Statement
National Weather Service St Louis MO
1203 PM CDT Wed Apr 29 2026

...The Flood Warning continues for the following rivers in
Missouri...

  Meramec River near Arnold.

River forecasts are based on observed precipitation and forecast
precipitation for the next 24 hours.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

This product, along with additional weather and stream information,
is available at https://water.noaa.gov/wfo/lsx

&&

MOC099-189-010515-
/O.EXT.KLSX.FL.W.0039.000000T0000Z-260505T1617Z/
/ARNM7.1.ER.260429T0612Z.260501T1200Z.260504T1017Z.NO/
1203 PM CDT Wed Apr 29 2026

...FLOOD WARNING NOW IN EFFECT UNTIL TUESDAY MORNING...

* WHAT...Minor flooding is occurring and minor flooding is forecast.

* WHERE...Meramec River near Arnold.

* WHEN...Until Tuesday morning.

* IMPACTS...At 30.0 feet, Wells Road below Suson Woods begins
  flooding at this height.

* ADDITIONAL DETAILS...
  - At 11:30 AM CDT Wednesday the stage was 25.2 feet.
  - Recent Activity...The maximum river stage in the 24 hours ending
    at 11:30 AM CDT Wednesday was 25.2 feet.
  - Forecast...The river is expected to rise to a crest of 28.7 feet
    Friday morning. It will then fall below flood stage early Monday
    morning.
  - Flood stage is 24.0 feet.



&&


All Times CDT Fld   Observed  Forecasts (7:00 am)
Location      Stg     Stage   Thu   Fri   Sat   Sun   Mon

Meramec River
 Arnold       24.0    25.2    27.5  28.7  28.2  26.5  23.8



&&

LAT...LON 3847 9044 3847 9032 3840 9033 3837 9036
      3841 9036 3842 9037 3843 9036 3845 9036
      3845 9041


$$

19

238 
WGUS83 KLSX 300112
FLSLSX

Flood Statement
National Weather Service St Louis MO
812 PM CDT Wed Apr 29 2026

...The Flood Warning continues for the following rivers in
Missouri...

  Meramec River near Arnold.

River forecasts are based on observed precipitation and forecast
precipitation for the next 24 hours.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

This product, along with additional weather and stream information,
is available at https://water.noaa.gov/wfo/lsx

&&

MOC099-189-011315-
/O.EXT.KLSX.FL.W.0039.000000T0000Z-260505T1525Z/
/ARNM7.1.ER.260429T0612Z.260501T1200Z.260504T0925Z.NO/
812 PM CDT Wed Apr 29 2026

...FLOOD WARNING NOW IN EFFECT UNTIL TUESDAY MORNING...

* WHAT...Minor flooding is occurring and minor flooding is forecast.

* WHERE...Meramec River near Arnold.

* WHEN...Until Tuesday morning.

* IMPACTS...At 27.0 feet, Meramec Bottom Road between Wells Road and
  Kerth Road begins flooding near this height.

* ADDITIONAL DETAILS...
  - At 7:30 PM CDT Wednesday the stage was 25.9 feet and rising.
  - Recent Activity...The river rose above flood stage early in the
    morning on April 29.
  - Forecast...The river is expected to rise to a crest of 28.4 feet
    Friday morning. It will then fall below flood stage early Monday
    morning.
  - Flood stage is 24.0 feet.



&&


All Times CDT Fld   Observed  Forecasts (7:00 am)
Location      Stg     Stage   Fri   Sat   Sun   Mon   Tue

Meramec River
 Arnold       24.0    25.9    28.4  28.0  26.3  23.7  20.6



&&

LAT...LON 3847 9044 3847 9032 3840 9033 3837 9036
      3841 9036 3842 9037 3843 9036 3845 9036
      3845 9041


$$

Kimble

574 
WGUS83 KLSX 301654
FLSLSX

Flood Statement
National Weather Service St Louis MO
1154 AM CDT Thu Apr 30 2026

...The Flood Warning continues for the following rivers in
Missouri...

  Meramec River near Arnold.

River forecasts are based on observed precipitation and forecast
precipitation for the next 24 hours.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

This product, along with additional weather and stream information,
is available at https://water.noaa.gov/wfo/lsx

&&

MOC099-189-020500-
/O.EXT.KLSX.FL.W.0039.000000T0000Z-260505T0834Z/
/ARNM7.1.ER.260429T0612Z.260501T1800Z.260504T0234Z.NO/
1154 AM CDT Thu Apr 30 2026

...FLOOD WARNING NOW IN EFFECT UNTIL LATE MONDAY NIGHT...

* WHAT...Minor flooding is occurring and minor flooding is forecast.

* WHERE...Meramec River near Arnold.

* WHEN...Until late Monday night.

* IMPACTS...At 27.0 feet, Meramec Bottom Road between Wells Road and
  Kerth Road begins flooding near this height.

* ADDITIONAL DETAILS...
  - At 11:30 AM CDT Thursday the stage was 26.8 feet.
  - Recent Activity...The maximum river stage in the 24 hours ending
    at 11:30 AM CDT Thursday was 26.8 feet.
  - Forecast...The river is expected to rise to a crest of 27.7 feet
    early tomorrow afternoon. It will then fall below flood stage
    late Sunday evening.
  - Flood stage is 24.0 feet.



&&


All Times CDT Fld   Observed  Forecasts (7:00 am)
Location      Stg     Stage   Fri   Sat   Sun   Mon   Tue

Meramec River
 Arnold       24.0    26.8    27.6  27.3  25.5  22.9  19.7



&&

LAT...LON 3847 9044 3847 9032 3840 9033 3837 9036
      3841 9036 3842 9037 3843 9036 3845 9036
      3845 9041


$$

19

445 
WGUS83 KLSX 010221
FLSLSX

Flood Statement
National Weather Service St Louis MO
921 PM CDT Thu Apr 30 2026

...The Flood Warning continues for the following rivers in
Missouri...

  Meramec River near Arnold.

River forecasts are based on observed precipitation and forecast
precipitation for the next 24 hours.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

This product, along with additional weather and stream information,
is available at https://water.noaa.gov/wfo/lsx

&&

MOC099-189-021430-
/O.EXT.KLSX.FL.W.0039.000000T0000Z-260505T0300Z/
/ARNM7.1.ER.260429T0612Z.260501T1800Z.260503T2100Z.NO/
921 PM CDT Thu Apr 30 2026

...FLOOD WARNING NOW IN EFFECT UNTIL MONDAY EVENING...

* WHAT...Minor flooding is occurring and minor flooding is forecast.

* WHERE...Meramec River near Arnold.

* WHEN...Until Monday evening.

* IMPACTS...At 27.0 feet, Meramec Bottom Road between Wells Road and
  Kerth Road begins flooding near this height.

* ADDITIONAL DETAILS...
  - At 9:00 PM CDT Thursday the stage was 27.2 feet.
  - Recent Activity...The maximum river stage in the 24 hours ending
    at 9:00 PM CDT Thursday was 27.2 feet.
  - Forecast...The river is expected to rise to a crest of 27.5 feet
    early tomorrow afternoon. It will then fall below flood stage
    Sunday afternoon.
  - Flood stage is 24.0 feet.



&&


All Times CDT Fld   Observed  Forecasts (7:00 am)
Location      Stg     Stage   Sat   Sun   Mon   Tue   Wed

Meramec River
 Arnold       24.0    27.2    27.0  25.0  22.4  19.4  17.5



&&

LAT...LON 3847 9044 3847 9032 3840 9033 3837 9036
      3841 9036 3842 9037 3843 9036 3845 9036
      3845 9041


$$

Maples

830 
WGUS83 KLSX 011821
FLSLSX

Flood Statement
National Weather Service St Louis MO
121 PM CDT Fri May 1 2026

...The Flood Warning is extended for the following rivers in
Missouri...

  Meramec River near Arnold.

River forecasts are based on observed precipitation and forecast
precipitation for the next 24 hours.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

This product, along with additional weather and stream information,
is available at https://water.noaa.gov/wfo/lsx

&&

MOC099-189-030630-
/O.EXT.KLSX.FL.W.0039.000000T0000Z-260505T0500Z/
/ARNM7.1.ER.260429T0612Z.260501T1345Z.260503T2300Z.NO/
121 PM CDT Fri May 1 2026

...FLOOD WARNING NOW IN EFFECT UNTIL LATE MONDAY NIGHT...

* WHAT...Minor flooding is occurring and minor flooding is forecast.

* WHERE...Meramec River near Arnold.

* WHEN...Until late Monday night.

* IMPACTS...At 27.0 feet, Meramec Bottom Road between Wells Road and
  Kerth Road begins flooding near this height.

* ADDITIONAL DETAILS...
  - At 1:00 PM CDT Friday the stage was 27.2 feet.
  - Recent Activity...The maximum river stage in the 24 hours ending
    at 1:00 PM CDT Friday was 27.4 feet.
  - Forecast...The river is expected to crest near 27.3 feet this
    afternoon and slowly fall into the evening. It will then fall
    below flood stage Sunday evening.
  - Flood stage is 24.0 feet.



&&


All Times CDT Fld   Observed  Forecasts (7:00 am)
Location      Stg     Stage   Sat   Sun   Mon   Tue   Wed

Meramec River
 Arnold       24.0    27.2    26.8  25.0  22.8  20.3  18.3



&&

LAT...LON 3847 9044 3847 9032 3840 9033 3837 9036
      3841 9036 3842 9037 3843 9036 3845 9036
      3845 9041


$$

Peine

853 
WGUS83 KLSX 020211
FLSLSX

Flood Statement
National Weather Service St Louis MO
911 PM CDT Fri May 1 2026

...The Flood Warning is extended for the following rivers in
Missouri...

  Meramec River near Arnold.

River forecasts are based on observed precipitation and forecast
precipitation for the next 24 hours.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Motorists should not attempt to drive around barricades or drive cars
through flooded areas.

This product, along with additional weather and stream information,
is available at https://water.noaa.gov/wfo/lsx

&&

MOC099-189-031415-
/O.EXT.KLSX.FL.W.0039.000000T0000Z-260505T0600Z/
/ARNM7.1.ER.260429T0612Z.260501T1345Z.260504T0000Z.NO/
911 PM CDT Fri May 1 2026

...FLOOD WARNING NOW IN EFFECT UNTIL LATE MONDAY NIGHT...

* WHAT...Minor flooding is occurring and minor flooding is forecast.

* WHERE...Meramec River near Arnold.

* WHEN...Until late Monday night.

* IMPACTS...At 27.0 feet, Meramec Bottom Road between Wells Road and
  Kerth Road begins flooding near this height.

* ADDITIONAL DETAILS...
  - At 8:30 PM CDT Friday the stage was 27.1 feet and falling.
  - Recent Activity...The river rose above flood stage early in the
    morning on April 29. It crested near 27.3 feet on May 1.
  - Forecast...The river is expected to fall below flood stage Sunday
    evening and continue falling over the following days.
  - Flood stage is 24.0 feet.



&&


All Times CDT Fld   Observed  Forecasts (7:00 am)
Location      Stg     Stage   Sun   Mon   Tue   Wed   Thu

Meramec River
 Arnold       24.0    27.1    25.1  23.0  20.4  18.3  16.9



&&

LAT...LON 3847 9044 3847 9032 3840 9033 3837 9036
      3841 9036 3842 9037 3843 9036 3845 9036
      3845 9041


$$

Kimble

141 
WGUS83 KLSX 021506
FLSLSX

Flood Statement
National Weather Service St Louis MO
1006 AM CDT Sat May 2 2026

...The Flood Warning continues for the following river in Missouri...

  Meramec River near Arnold.

River forecasts are based on observed precipitation and forecast
precipitation for the next 24 hours.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Motorists should not attempt to drive around barricades or drive cars
through flooded areas.

This product, along with additional weather and stream information,
is available at https://water.noaa.gov/wfo/lsx

&&

MOC099-189-040315-
/O.EXT.KLSX.FL.W.0039.000000T0000Z-260505T0448Z/
/ARNM7.1.ER.260429T0612Z.260501T1345Z.260503T2248Z.NO/
1006 AM CDT Sat May 2 2026

...FLOOD WARNING NOW IN EFFECT UNTIL MONDAY EVENING...

* WHAT...Minor flooding is occurring and minor flooding is forecast.

* WHERE...Meramec River near Arnold.

* WHEN...Until Monday evening.

* ADDITIONAL DETAILS...
  - At 9:30 AM CDT Saturday the stage was 26.4 feet.
  - Forecast...The river is expected to fall below flood stage Sunday
    afternoon.
  - Flood stage is 24.0 feet.



&&


All Times CDT Fld   Observed  Forecasts (7:00 am)
Location      Stg     Stage   Sun   Mon   Tue   Wed   Thu

Meramec River
 Arnold       24.0    26.4    24.9  22.8  20.4  18.4  17.1



&&

LAT...LON 3847 9044 3847 9032 3840 9033 3837 9036
      3841 9036 3842 9037 3843 9036 3845 9036
      3845 9041


$$

Gosselin

723 
WGUS83 KLSX 030044
FLSLSX

Flood Statement
National Weather Service St Louis MO
744 PM CDT Sat May 2 2026

...The Flood Warning continues for the following rivers in
Missouri...

  Meramec River near Arnold.

River forecasts are based on observed precipitation and forecast
precipitation for the next 24 hours.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Motorists should not attempt to drive around barricades or drive cars
through flooded areas.

This product, along with additional weather and stream information,
is available at https://water.noaa.gov/wfo/lsx

&&

MOC099-189-041245-
/O.CON.KLSX.FL.W.0039.000000T0000Z-260505T0448Z/
/ARNM7.1.ER.260429T0612Z.260501T1345Z.260503T2248Z.NO/
744 PM CDT Sat May 2 2026

...FLOOD WARNING REMAINS IN EFFECT UNTIL MONDAY EVENING...

* WHAT...Minor flooding is occurring and minor flooding is forecast.

* WHERE...Meramec River near Arnold.

* WHEN...Until Monday evening.

* IMPACTS...At 26.0 feet, Athletic fields east of I-55 begin flooding
  near this height.

* ADDITIONAL DETAILS...
  - At 7:00 PM CDT Saturday the stage was 25.8 feet and falling.
  - Recent Activity...The river rose above flood stage on April 29,
    cresting near 27.3 feet on May 1.
  - Forecast...The river is expected to fall below flood stage
    tomorrow afternoon and continue falling in the following days.
  - Flood stage is 24.0 feet.



&&


All Times CDT Fld   Observed  Forecasts (7:00 am)
Location      Stg     Stage   Mon   Tue   Wed   Thu   Fri

Meramec River
 Arnold       24.0    25.8    22.9  20.5  18.6  17.3  16.4



&&

LAT...LON 3847 9044 3847 9032 3840 9033 3837 9036
      3841 9036 3842 9037 3843 9036 3845 9036
      3845 9041


$$

Kimble

015 
WGUS83 KLSX 031523
FLSLSX

Flood Statement
National Weather Service St Louis MO
1023 AM CDT Sun May 3 2026

...The Flood Warning continues for the following rivers in
Missouri...

  Meramec River near Arnold.

River forecasts are based on observed precipitation and forecast
precipitation for the next 24 hours.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Motorists should not attempt to drive around barricades or drive cars
through flooded areas.

This product, along with additional weather and stream information,
is available at https://water.noaa.gov/wfo/lsx

&&

MOC099-189-050330-
/O.CON.KLSX.FL.W.0039.000000T0000Z-260505T0448Z/
/ARNM7.1.ER.260429T0612Z.260501T1345Z.260503T2248Z.NO/
1023 AM CDT Sun May 3 2026

...FLOOD WARNING REMAINS IN EFFECT UNTIL MONDAY EVENING...

* WHAT...Minor flooding is occurring and minor flooding is forecast.

* WHERE...Meramec River near Arnold.

* WHEN...Until Monday evening.

* ADDITIONAL DETAILS...
  - At 10:00 AM CDT Sunday the stage was 24.7 feet.
  - Recent Activity...The maximum river stage in the 24 hours ending
    at 10:00 AM CDT Sunday was 26.4 feet.
  - Forecast...The river is expected to fall below flood stage late
    this afternoon.
  - Flood stage is 24.0 feet.



&&


All Times CDT Fld   Observed  Forecasts (7:00 am)
Location      Stg     Stage   Mon   Tue   Wed   Thu   Fri

Meramec River
 Arnold       24.0    24.7    22.9  20.3  18.2  17.2  16.5



&&

LAT...LON 3847 9044 3847 9032 3840 9033 3837 9036
      3841 9036 3842 9037 3843 9036 3845 9036
      3845 9041


$$

Britt

499 
WGUS83 KLSX 040014
FLSLSX

Flood Statement
National Weather Service St Louis MO
714 PM CDT Sun May 3 2026

...The Flood Warning is cancelled for the following river in
Missouri...

  Meramec River near Arnold.

River forecasts are based on observed precipitation and forecast
precipitation for the next 24 hours.

MOC099-189-040115-
/O.CAN.KLSX.FL.W.0039.000000T0000Z-260504T0014Z/
/ARNM7.1.ER.260429T0612Z.260501T1345Z.260503T2237Z.NO/
714 PM CDT Sun May 3 2026

...FLOOD WARNING IS CANCELLED...

The Flood Warning is cancelled for
  the Meramec River near Arnold.

* ADDITIONAL DETAILS...
  - At 7:00 PM CDT Sunday the stage was 23.9 feet.
  - Forecast...The river is expected to fall to 20.4 feet Tuesday
    morning



&&


All Times CDT Fld   Observed  Forecasts (7:00 am)
Location      Stg     Stage   Tue   Wed   Thu   Fri   Sat

Meramec River
 Arnold       24.0    23.9    20.4  18.2  17.2  16.6  16.0



&&

LAT...LON 3847 9044 3847 9032 3840 9033 3837 9036
      3841 9036 3842 9037 3843 9036 3845 9036
      3845 9041


$$

Gosselin

Area Forecast Discussion...Updated Aviation
National Weather Service Saint Louis MO
647 AM CDT Mon Apr 27 2026

.KEY MESSAGES...

- While periods of storms are expected through Monday morning, the most
  potent thunderstorms will occur this afternoon and evening.

- Thunderstorms this afternoon and evening will be capable of
  damaging wind gusts, large hail, and strong tornadoes.

- A period of cool, calm weather is expected mid-week through the
  weekend.

&&

.SHORT TERM... (Through Tuesday Night)
Issued at 155 AM CDT Mon Apr 27 2026

Storms across southeastern Missouri continue to butt up against an
instability gradient draped from north to south across Missouri.
The warm air advection feeding these storms will also push greater
instability slowly northeastward through this morning, though
propagation vectors will favor convection continuing to move east-
southeastward generally away from the CWA or into an unfavorable
environment. Additionally, the low-level jet refocusing across
Kansas will continue to support the downward trend in convection
across southeastern Missouri early this morning. Any linger storms
over the next couple of hours will be capable mainly of large hail,
though there is also a very low damaging wind and tornado threat for
storms that remain surface based.

Our attention turns to the storms over eastern Kansas that are
propagating eastward with the nose of the low-level jet. With the
nose of this low-level jet edging into northeastern Missouri later
this morning, the focus for these storms will spread into portions
of the CWA north of I-70. Vertical thermal profiles suggest that this
convection will be elevated, mitigating a threat of damaging wind
gusts and/or tornadoes. However, with around 40 kts of effective
shear and building MUCAPE, there is a low chance for isolated
instances of large hail.

How long this convection lingers is uncertain, although guidance
trends have been toward a lull in convective activity in the wake of
this convection and that associated with a cold front during the
late afternoon and evening. Ahead of the front, the warm sector
remains capped through much of the afternoon per a majority of
deterministic soundings. Although, any remnant outflow or
differential heating boundary from early day convection may serve as
enough of a forcing mechanism to spawn discrete convection during
the afternoon as lift from an approaching shortwave increases over
the region. If this convection does form, it will be in an
environment characterized by 2,000-2,500 J/kg of SBCAPE and roughly
50 kts of deep-layer shear. This will favor supercells capable of
all hazards, with long curved hodographs favoring strong tornadoes,
especially if storms are able to latch on to any remnant boundaries
across the CWA.

Where the environment isn't contaminated from earlier rounds of
convection, additional updrafts are expected along the cold front as
it enters the area 4-5pm. Forcing from the front paired with lift
from the shortwave will lead to numerous updrafts along the front.
While this will be occurring within a similar environment detailed
prior, the number of updrafts paired with them occurring along the
front may lead to destructive interactions and congealing into line
segments and/or clusters. While this will tend to limit a strong
tornado threat, storms will still be capable of all severe hazards.
Convection is expected to depart the CWA with the front by 9-10pm.

Even with the FROPA Monday evening, the threat for convection will
continue on Tuesday. Guidance consensus has the front stalling just
south of the CWA early Tuesday and then buckling northward as a
shortwave moves through the Central Plains and into the Midwest
through the day. This shortwave will send a subtle surface
reflection through the Mid South along the front, with a brief
period of warm air advection that will help force elevated
convection for areas mainly along and south of I-70. If the front
can move northward enough, shear profiles and instability amounts
favor supercells capable primarily of large hail across far
southeastern Missouri during the afternoon. Waning instability and
the front continuing southward will bring an end to rain chances
during the evening.

Elmore

&&

.LONG TERM... (Tuesday Night through Sunday)
Issued at 155 AM CDT Mon Apr 27 2026

Both deterministic guidance and ensemble clusters keep upper-level
troughing slowly moving eastward over the eastern CONUS through the
long range forecast period. This will maintain northwesterly flow
over the Middle Mississippi Valley through Saturday as several
rounds of high pressure pass through the region. As a result,
temperatures will run at or below climatological normals into the
weekend and mostly dry weather is expected.

Elmore

&&

.AVIATION...  (For the 12z TAFs through 12z Tuesday Morning)
Issued at 647 AM CDT Mon Apr 27 2026

Thunderstorms are expected at times throughout the day, impacting
all terminals. The greatest coverage of thunderstorms this morning
is expected to be across central, northeastern MO into west-central
IL impacting KCOU, KJEF, and KUIN, with lower confidence in
thunderstorms reaching the St. Louis metro terminals through early
afternoon. Another round of redevelopment will take place this
afternoon and evening with the greatest chance of severe
thunderstorms as well. These thunderstorms will be capable of hail,
strong winds, and some tornadoes. Trends will need to be monitored
for more significant terminal impacts beyond MVFR to IFR flight
conditions.

A cold front will pass through the region this evening, veering
southerly winds to northwesterly with drier conditions prevailing.
There is the potential for some post-frontal MVFR ceilings late
tonight into Tuesday morning, with the highest chance of impacts at
KUIN. However, given that confidence is low in impacts before the
end of the TAF period, VFR flight conditions are maintained for
now.

Pfahler

&&

.LSX WATCHES/WARNINGS/ADVISORIES...
MO...None.
IL...None.
&&

WFO LSX

Hazardous Weather Outlook
National Weather Service St Louis MO
202 AM CDT Mon Apr 27 2026

ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027-
034>036-041-042-047>052-059>065-072>075-084-085-099-280715-
Greene IL-Macoupin IL-Montgomery IL-Bond IL-Fayette IL-Clinton IL-
Marion IL-Washington IL-Randolph IL-Adams IL-Brown IL-Pike IL-
Calhoun IL-Jersey IL-Madison IL-Saint Clair IL-Monroe IL-Knox MO-
Lewis MO-Shelby MO-Marion MO-Monroe MO-Ralls MO-Pike MO-Boone MO-
Audrain MO-Moniteau MO-Cole MO-Osage MO-Callaway MO-Montgomery MO-
Lincoln MO-Gasconade MO-Warren MO-Saint Charles MO-Franklin MO-
Saint Louis MO-Saint Louis City MO-Jefferson MO-Crawford MO-
Washington MO-Saint Francois MO-Sainte Genevieve MO-Iron MO-
Madison MO-Reynolds MO-
202 AM CDT Mon Apr 27 2026

This Hazardous Weather Outlook is for portions of eastern and
central Missouri as well as west central and southwest Illinois.

.DAY ONE...Today and tonight.

Periods of thunderstorms are expected through the day into this
evening. Thunderstorms this afternoon and evening will be capable of
large hail, damaging wind gusts, and tornadoes.

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

There is a chance of thunderstorms Tuesday.

.SPOTTER INFORMATION STATEMENT...

Spotters are encouraged to report wind damage, hail occurrence and
size, and tornado occurrence to NWS St. Louis.

Elmore

Preliminary Local Storm Report
National Weather Service St Louis MO
217 PM CDT Mon Apr 27 2026

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

0148 PM     Hail             1 S Saint John          38.70N 90.35W
04/27/2026  M1.00 Inch       St. Louis          MO   Trained Spotter

            At Midland and I-170.

&&

Britt

Preliminary Local Storm Report
National Weather Service St Louis MO
223 PM CDT Mon Apr 27 2026

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

0221 PM     Hail             Glen Carbon             38.76N 89.97W
04/27/2026  M1.00 Inch       Madison            IL   Trained Spotter

&&

Carney

Preliminary Local Storm Report
National Weather Service St Louis MO
226 PM CDT Mon Apr 27 2026

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

0619 AM     Hail             2 W Saint Louis         38.65N 90.28W
04/27/2026  E1.00 Inch       St. Louis City     MO   Public

            Report from mPING: Quarter (1.00 in.).

0621 AM     Hail             2 SE Hillsdale          38.66N 90.27W
04/27/2026  E1.00 Inch       St. Louis City     MO   Public

            Report from mPING: Quarter (1.00 in.).

0642 AM     Hail             2 SE Hillsdale          38.66N 90.27W
04/27/2026  E1.25 Inch       St. Louis City     MO   Public

            Report from mPING: Half Dollar (1.25 in.).

0313 AM     Hail             1 NW Bismarck           37.78N 90.63W
04/27/2026  E1.50 Inch       St. Francois       MO   Public

            Report from mPING: Ping Pong Ball (1.50
            in.).

0318 AM     Hail             1 NW Bismarck           37.78N 90.63W
04/27/2026  E1.75 Inch       St. Francois       MO   Public

            Report from mPING: Golf Ball (1.75 in.).

0320 AM     Hail             1 NW Bismarck           37.78N 90.63W
04/27/2026  E2.00 Inch       St. Francois       MO   Public

            Report from mPING: Hen Egg (2.00 in.).

0329 AM     Hail             1 SW Desloge            37.87N 90.53W
04/27/2026  E1.00 Inch       St. Francois       MO   Public

            Report from mPING: Quarter (1.00 in.).

0329 AM     Hail             1 N Leadington          37.84N 90.48W
04/27/2026  E1.00 Inch       St. Francois       MO   Public

            Report from mPING: Quarter (1.00 in.).

0337 AM     Hail             1 NW Farmington         37.79N 90.43W
04/27/2026  M1.25 Inch       St. Francois       MO   Public

0339 AM     Hail             1 S Farmington          37.76N 90.42W
04/27/2026  E1.75 Inch       St. Francois       MO   Public

            Report from mPING: Golf Ball (1.75 in.).

0358 AM     Hail             5 E Farmington          37.77N 90.34W
04/27/2026  E1.50 Inch       St. Francois       MO   Public

            Report from mPING: Ping Pong Ball (1.50
            in.).

0418 AM     Hail             4 SE Farmington         37.74N 90.36W
04/27/2026  E2.00 Inch       St. Francois       MO   Public

            Report from mPING: Hen Egg (2.00 in.).

1225 PM     Hail             2 S Harvester           38.72N 90.59W
04/27/2026  E1.00 Inch       St. Charles        MO   Public

            Report from mPING: Quarter (1.00 in.).

&&

Preliminary Local Storm Report
National Weather Service St Louis MO
228 PM CDT Mon Apr 27 2026

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

0138 PM     Hail             1 E Clarkson Valley     38.63N 90.58W
04/27/2026  E1.25 Inch       St. Louis          MO   Public

0134 PM     Hail             1 SW Bridgeton          38.75N 90.44W
04/27/2026  E1.50 Inch       St. Louis          MO   Public

            Report from mPING: Ping Pong Ball (1.50
            in.).

&&

Preliminary Local Storm Report
National Weather Service St Louis MO
237 PM CDT Mon Apr 27 2026

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

0221 PM     Hail             4 SE Jonesburg          38.82N 91.26W
04/27/2026  E1.00 Inch       Warren             MO   Public

&&

Preliminary Local Storm Report
National Weather Service St Louis MO
245 PM CDT Mon Apr 27 2026

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

0152 PM     Tstm Wnd Dmg     2 SW Marine             38.77N 89.80W
04/27/2026                   Madison            IL   Public

            Shed damaged.

&&

Carney