River Flood Warning 22, NWS St. Louis, MO

112 
WGUS83 KLSX 201537
FLSLSX

Flood Statement
National Weather Service St Louis MO
1037 AM CDT Sun Apr 20 2025

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

  Big River at Byrnesville.

  Kaskaskia River at Carlyle.

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

  Meramec River near Sullivan.

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

&&

MOC099-220345-
/O.EXT.KLSX.FL.W.0022.000000T0000Z-250422T1920Z/
/BYRM7.1.ER.250420T1104Z.250421T0600Z.250421T1920Z.UU/
1037 AM CDT Sun Apr 20 2025

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

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

* WHERE...Big River at Byrnesville.

* WHEN...Until Tuesday afternoon.

* IMPACTS...At 19.0 feet, Dutch Creek Road south of Byrnesville and 
  Byrnesville Road near John McKeever Road north of Byrnesville 
  begin to flood.

* ADDITIONAL DETAILS...
  - At 9:45 AM CDT Sunday the stage was 16.7 feet.
  - Recent Activity...The maximum river stage in the 24 hours
    ending at 9:45 AM CDT Sunday was 16.7 feet.
  - Forecast...The river will rise to 18.6 feet just after
    midnight tonight. It will then fall below flood stage early
    tomorrow afternoon to 13.5 feet Tuesday morning. It will rise
    to 14.4 feet Tuesday evening. It will then fall again and
    remain below flood stage.
  - Flood stage is 16.0 feet.



&&


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

Big River
  Byrnesville  16.0    16.7    17.9  13.5  13.5  9.3   7.5



&&

LAT...LON 3834 9060 3833 9068 3846 9063 3849 9057


$$

MOC055-221-220345-
/O.EXT.KLSX.FL.W.0020.000000T0000Z-250424T0700Z/
/SLLM7.1.ER.250419T2324Z.250421T0000Z.250423T0100Z.UU/
1037 AM CDT Sun Apr 20 2025

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

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

* WHERE...Meramec River near Sullivan.

* WHEN...Until late Wednesday night.

* IMPACTS...At 15.6 feet, The basic loop of the Onondaga Cave State 
  Park campground begins flooding near this height.

* ADDITIONAL DETAILS...
  - At 9:29 AM CDT Sunday the stage was 14.7 feet.
  - Recent Activity...The maximum river stage in the 24 hours
    ending at 9:29 AM CDT Sunday was 14.7 feet.
  - Forecast...The river is expected to rise to a crest of 15.2
    feet this evening. It will then fall below flood stage
    Tuesday evening.
  - Flood stage is 11.0 feet.



&&


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

Meramec River
  Sullivan     11.0    14.7    14.9  12.8  9.8   8.1   7.3



&&

LAT...LON 3801 9122 3807 9126 3816 9116 3828 9110
      3832 9097 3839 9091 3839 9082 3825 9092
      3823 9105 3808 9111


$$

ILC027-220345-
/O.CON.KLSX.FL.W.0002.000000T0000Z-000000T0000Z/
/KCAI2.1.ER.000000T0000Z.250420T0345Z.000000T0000Z.NO/
1037 AM CDT Sun Apr 20 2025

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

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

* WHERE...Kaskaskia River at Carlyle.

* WHEN...Until further notice.

* IMPACTS...At 23.6 feet, Near this height, wastewater treatmeant 
  ponds along the left bank are threatened by floodwaters.

* ADDITIONAL DETAILS...
  - At 10:00 AM CDT Sunday the stage was 22.7 feet.
  - Recent Activity...The maximum river stage in the 24 hours
    ending at 10:00 AM CDT Sunday was 22.7 feet.
  - Forecast...The river is expected to rise to a crest of 22.7
    feet this afternoon.
  - Flood stage is 16.5 feet.



&&


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

Kaskaskia River
  Carlyle        16.5    22.7    22.7  22.7  22.7  22.7  22.7



&&

LAT...LON 3862 8936 3861 8933 3851 8937 3849 8942
      3854 8942


$$

MRB

065 
WGUS83 KLSX 210158
FLSLSX

Flood Statement
National Weather Service St Louis MO
858 PM CDT Sun Apr 20 2025

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

  Big River at Byrnesville.

  Meramec River near Sullivan.

  Bourbeuse River at Union.

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.

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

&&

MOC099-221400-
/O.EXT.KLSX.FL.W.0022.000000T0000Z-250422T1836Z/
/BYRM7.1.ER.250420T1104Z.250421T0600Z.250421T1836Z.UU/
858 PM CDT Sun Apr 20 2025

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

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

* WHERE...Big River at Byrnesville.

* WHEN...Until Tuesday afternoon.

* IMPACTS...At 19.0 feet, Dutch Creek Road south of Byrnesville and 
  Byrnesville Road near John McKeever Road north of Byrnesville 
  begin to flood.

* ADDITIONAL DETAILS...
  - At 8:45 PM CDT Sunday the stage was 18.3 feet.
  - Forecast...The river is expected to rise to a crest of 19.0
    feet just after midnight tonight.
  - Flood stage is 16.0 feet.



&&


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

Big River
  Byrnesville  16.0    18.3    13.3  13.5  9.3   7.5   6.8



&&

LAT...LON 3834 9060 3833 9068 3846 9063 3849 9057


$$

MOC055-221-221400-
/O.EXT.KLSX.FL.W.0020.000000T0000Z-250423T2240Z/
/SLLM7.1.ER.250419T2324Z.250420T1759Z.250422T1640Z.UU/
858 PM CDT Sun Apr 20 2025

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

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

* WHERE...Meramec River near Sullivan.

* WHEN...Until Wednesday afternoon.

* ADDITIONAL DETAILS...
  - At 8:29 PM CDT Sunday the stage was 14.6 feet.
  - Forecast...The river is expected to fall below flood stage
    late Tuesday morning.
  - Flood stage is 11.0 feet.



&&


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

Meramec River
  Sullivan     11.0    14.6    11.7  8.7   7.5   7.1   6.7



&&

LAT...LON 3801 9122 3807 9126 3816 9116 3828 9110
      3832 9097 3839 9091 3839 9082 3825 9092
      3823 9105 3808 9111


$$

MOC071-221400-
/O.EXT.KLSX.FL.W.0026.250421T0627Z-250423T2000Z/
/UNNM7.1.ER.250421T0627Z.250421T1800Z.250422T1400Z.NO/
858 PM CDT Sun Apr 20 2025

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

* WHAT...Minor flooding is forecast.

* WHERE...Bourbeuse River at Union.

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

* IMPACTS...At 17.0 feet, Flat Creek backs up to Smeltzer's Park.

* ADDITIONAL DETAILS...
  - At 8:30 PM CDT Sunday the stage was 13.3 feet.
  - Forecast...The river is expected to rise above flood stage
    just after midnight tonight to a crest of 16.5 feet early
    tomorrow afternoon.
  - Flood stage is 15.0 feet.



&&


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

Bourbeuse River
  Union          15.0    13.3    15.3  12.0  7.1   4.6   3.7



&&

LAT...LON 3826 9123 3832 9133 3838 9137 3848 9094
      3842 9087


$$

Gosselin

926 
WGUS83 KLSX 211603
FLSLSX

Flood Statement
National Weather Service St Louis MO
1103 AM CDT Mon Apr 21 2025

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

  Bourbeuse River at Union.

  Big River at Byrnesville.

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.

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

&&

MOC071-230415-
/O.EXT.KLSX.FL.W.0026.000000T0000Z-250424T0840Z/
/UNNM7.1.ER.250421T1600Z.250422T0600Z.250423T0240Z.NO/
1103 AM CDT Mon Apr 21 2025

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

* WHAT...Minor flooding is forecast.

* WHERE...Bourbeuse River at Union.

* WHEN...Until late Wednesday night.

* IMPACTS...At 17.0 feet, Flat Creek backs up to Smeltzer's Park.

* ADDITIONAL DETAILS...
  - At 10:30 AM CDT Monday the stage was 14.9 feet.
  - Forecast...The river is expected to rise to a crest of 16.9
    feet just after midnight tonight. It will then fall below
    flood stage late tomorrow evening.
  - Flood stage is 15.0 feet.



&&


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

Bourbeuse River
  Union          15.0    14.9    16.7  13.5  8.0   4.9   3.8



&&

LAT...LON 3826 9123 3832 9133 3838 9137 3848 9094
      3842 9087


$$

MOC099-230415-
/O.EXT.KLSX.FL.W.0022.000000T0000Z-250424T0230Z/
/BYRM7.1.ER.250420T1104Z.250421T0630Z.250423T0230Z.UU/
1103 AM CDT Mon Apr 21 2025

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

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

* WHERE...Big River at Byrnesville.

* WHEN...Until Wednesday evening.

* IMPACTS...At 18.0 feet, Cedar Hill Road at Cedar Hill and Klondike 
  Road south of Cedar Hill begin to flood near this height.

* ADDITIONAL DETAILS...
  - At 10:45 AM CDT Monday the stage was 17.5 feet.
  - Forecast...The river is expected to fall below flood stage
    late tomorrow evening and continue falling to 5.7 feet
    Monday, April 28.
  - Flood stage is 16.0 feet.



&&


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

Big River
  Byrnesville  16.0    17.5    16.8  13.5  8.5   7.5   6.8



&&

LAT...LON 3834 9060 3833 9068 3846 9063 3849 9057


$$

Carney

196 
WGUS83 KLSX 220306
FLSLSX

Flood Statement
National Weather Service St Louis MO
1006 PM CDT Mon Apr 21 2025

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

  Meramec River near Eureka.

  Meramec River at Pacific.

  Big River at Byrnesville.

  Meramec River near Sullivan.

  Meramec River near Arnold.

  Meramec River at Valley Park.

  Bourbeuse River at Union.

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

&&

MOC099-189-231515-
/O.EXT.KLSX.FL.W.0030.000000T0000Z-250425T0400Z/
/ERKM7.1.ER.250421T0852Z.250422T1800Z.250423T2200Z.NO/
1006 PM CDT Mon Apr 21 2025

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

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

* WHERE...Meramec River near Eureka.

* WHEN...Until Thursday evening.

* IMPACTS...At 22.0 feet, Willman Road near the Highway 109 bridge 
  becomes inundated and impassable.

* ADDITIONAL DETAILS...
  - At 9:30 PM CDT Monday the stage was 20.9 feet.
  - Recent Activity...The maximum river stage in the 24 hours
    ending at 9:30 PM CDT Monday was 20.9 feet.
  - Forecast...The river is expected to rise to a crest of 21.7
    feet early tomorrow afternoon. It will then fall below flood
    stage Wednesday afternoon.
  - Flood stage is 19.0 feet.



&&


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

Meramec River
  Eureka       19.0    20.9    20.8  15.7  10.3  8.2   7.2



&&

LAT...LON 3844 9064 3850 9066 3855 9064 3855 9056
      3850 9056


$$

MOC071-099-231515-
/O.EXT.KLSX.FL.W.0029.000000T0000Z-250425T0036Z/
/PCFM7.1.ER.250421T1845Z.250422T1800Z.250423T1836Z.NO/
1006 PM CDT Mon Apr 21 2025

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

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

* WHERE...Meramec River at Pacific.

* WHEN...Until Thursday evening.

* IMPACTS...At 17.0 feet, State Highway AK begins flooding near the 
  intersection with State Highway O near this height.

* ADDITIONAL DETAILS...
  - At 9:30 PM CDT Monday the stage was 15.8 feet.
  - Recent Activity...The maximum river stage in the 24 hours
    ending at 9:30 PM CDT Monday was 15.8 feet.
  - Forecast...The river is expected to rise to a crest of 17.0
    feet early tomorrow afternoon. It will then fall below flood
    stage early Wednesday afternoon.
  - Flood stage is 15.0 feet.



&&


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

Meramec River
  Pacific      15.0    15.8    15.9  11.7  6.5   4.2   3.1



&&

LAT...LON 3839 9082 3839 9091 3849 9081 3850 9066
      3844 9064 3843 9077


$$

MOC099-231515-
/O.EXT.KLSX.FL.W.0022.000000T0000Z-250424T0055Z/
/BYRM7.1.ER.250420T1104Z.250421T0630Z.250423T0055Z.UU/
1006 PM CDT Mon Apr 21 2025

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

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

* WHERE...Big River at Byrnesville.

* WHEN...Until Wednesday evening.

* IMPACTS...At 18.0 feet, Cedar Hill Road at Cedar Hill and Klondike 
  Road south of Cedar Hill begin to flood near this height.

* ADDITIONAL DETAILS...
  - At 9:45 PM CDT Monday the stage was 16.4 feet.
  - Recent Activity...The maximum river stage in the 24 hours
    ending at 9:45 PM CDT Monday was 17.6 feet.
  - Forecast...The river is expected to rise to a crest of 16.8
    feet early tomorrow afternoon. It will then fall below flood
    stage tomorrow evening.
  - Flood stage is 16.0 feet.



&&


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

Big River
  Byrnesville  16.0    16.4    13.3  8.7   7.5   6.8   6.3



&&

LAT...LON 3834 9060 3833 9068 3846 9063 3849 9057


$$

MOC055-221-231515-
/O.EXT.KLSX.FL.W.0020.000000T0000Z-250424T0000Z/
/SLLM7.1.ER.250419T2324Z.250420T1759Z.250422T1800Z.UU/
1006 PM CDT Mon Apr 21 2025

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

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

* WHERE...Meramec River near Sullivan.

* WHEN...Until Wednesday evening.

* ADDITIONAL DETAILS...
  - At 9:29 PM CDT Monday the stage was 12.9 feet.
  - Recent Activity...The maximum river stage in the 24 hours
    ending at 9:29 PM CDT Monday was 14.7 feet.
  - Forecast...The river is expected to fall below flood stage
    early tomorrow afternoon.
  - Flood stage is 11.0 feet.



&&


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

Meramec River
  Sullivan     11.0    12.9    8.9   7.7   7.0   6.7   6.2



&&

LAT...LON 3801 9122 3807 9126 3816 9116 3828 9110
      3832 9097 3839 9091 3839 9082 3825 9092
      3823 9105 3808 9111


$$

MOC099-189-231515-
/O.EXT.KLSX.FL.W.0035.250422T1531Z-250426T0000Z/
/ARNM7.1.ER.250422T1531Z.250423T1200Z.250424T1800Z.NO/
1006 PM CDT Mon Apr 21 2025

...FLOOD WARNING NOW IN EFFECT FROM TUESDAY MORNING TO FRIDAY 
EVENING...

* WHAT...Minor flooding is forecast.

* WHERE...Meramec River near Arnold.

* WHEN...From Tuesday morning to Friday evening.

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

* ADDITIONAL DETAILS...
  - At 9:30 PM CDT Monday the stage was 20.2 feet.
  - Forecast...The river is expected to rise above flood stage
    late tomorrow morning to a crest of 26.5 feet Wednesday
    morning. It will then fall below flood stage early Thursday
    afternoon.
  - Flood stage is 24.0 feet.



&&


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

Meramec River
  Arnold       24.0    20.2    26.5  25.2  20.1  15.7  13.4



&&

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


$$

MOC099-189-231515-
/O.CON.KLSX.FL.W.0031.000000T0000Z-250425T0632Z/
/VLLM7.1.ER.250422T0007Z.250423T0600Z.250424T0032Z.NO/
1006 PM CDT Mon Apr 21 2025

...FLOOD WARNING REMAINS IN EFFECT UNTIL LATE THURSDAY NIGHT...

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

* WHERE...Meramec River at Valley Park.

* WHEN...Until late Thursday night.

* IMPACTS...At 19.5 feet, Buder Park and the recreation park at the 
  water plant floods.

* ADDITIONAL DETAILS...
  - At 9:30 PM CDT Monday the stage was 18.2 feet.
  - Recent Activity...The maximum river stage in the 24 hours
    ending at 9:30 PM CDT Monday was 18.2 feet.
  - Forecast...The river is expected to rise to a crest of 19.6
    feet early Wednesday morning. It will then fall below flood
    stage Wednesday evening.
  - Flood stage is 18.0 feet.



&&


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

Meramec River
  Valley Park  18.0    18.2    19.5  15.7  9.3   5.5   3.9



&&

LAT...LON 3850 9056 3855 9056 3857 9047 3856 9043
      3853 9042 3853 9051


$$

MOC071-231515-
/O.CON.KLSX.FL.W.0026.000000T0000Z-250424T0840Z/
/UNNM7.1.ER.250421T1600Z.250422T1200Z.250423T0240Z.NO/
1006 PM CDT Mon Apr 21 2025

...FLOOD WARNING REMAINS IN EFFECT UNTIL LATE WEDNESDAY NIGHT...

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

* WHERE...Bourbeuse River at Union.

* WHEN...Until late Wednesday night.

* IMPACTS...At 17.0 feet, Flat Creek backs up to Smeltzer's Park.

* ADDITIONAL DETAILS...
  - At 9:30 PM CDT Monday the stage was 15.3 feet.
  - Recent Activity...The maximum river stage in the 24 hours
    ending at 9:30 PM CDT Monday was 15.3 feet.
  - Forecast...The river is expected to rise to a crest of 16.0
    feet tomorrow morning. It will then fall below flood stage
    late tomorrow evening.
  - Flood stage is 15.0 feet.



&&


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

Bourbeuse River
  Union          15.0    15.3    13.5  8.0   4.9   3.8   3.4



&&

LAT...LON 3826 9123 3832 9133 3838 9137 3848 9094
      3842 9087


$$

Britt

720 
WGUS83 KLSX 221457
FLSLSX

Flood Statement
National Weather Service St Louis MO
957 AM CDT Tue Apr 22 2025

...The Flood Warning remains in effect for the following rivers in 
Missouri...

  Big River at Byrnesville.

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

&&

MOC099-240130-
/O.EXT.KLSX.FL.W.0022.000000T0000Z-250424T0130Z/
/BYRM7.1.ER.250420T1104Z.250421T0630Z.250423T0130Z.UU/
957 AM CDT Tue Apr 22 2025

...FLOOD WARNING REMAINS IN EFFECT...

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

* WHERE...Big River at Byrnesville.

* WHEN...Until Wednesday evening.

* IMPACTS...At 15.5 feet, Rockford Beach Park at the Highway MM 
  bridge begins flooding.

* ADDITIONAL DETAILS...
  - At 9:45 AM CDT Tuesday the stage was 16.5 feet.
  - Forecast...The river will fall below flood stage this
    evening.
  - Flood stage is 16.0 feet.



&&


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

Big River
  Byrnesville  16.0    16.5    13.2  8.3   7.7   7.2   6.7



&&

LAT...LON 3834 9060 3833 9068 3846 9063 3849 9057


$$

Carney

028 
WGUS83 KLSX 221748
FLSLSX

Flood Statement
National Weather Service St Louis MO
1248 PM CDT Tue Apr 22 2025

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

  Big River at Byrnesville.

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

&&

MOC099-240130-
/O.CON.KLSX.FL.W.0022.000000T0000Z-250424T0130Z/
/BYRM7.1.ER.250420T1104Z.250421T0630Z.250423T0130Z.UU/
1248 PM CDT Tue Apr 22 2025

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

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

* WHERE...Big River at Byrnesville.

* WHEN...Until Wednesday evening.

* IMPACTS...At 15.5 feet, Rockford Beach Park at the Highway MM 
  bridge begins flooding.

* ADDITIONAL DETAILS...
  - At 11:45 AM CDT Tuesday the stage was 16.4 feet.
  - Forecast...The river is expected to rise to a crest of 16.6
    feet this afternoon. It will then fall below flood stage this
    evening.
  - Flood stage is 16.0 feet.



&&


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

Big River
  Byrnesville  16.0    16.4    13.2  8.3   7.7   7.2   6.7



&&

LAT...LON 3834 9060 3833 9068 3846 9063 3849 9057


$$

Carney

826 
WGUS83 KLSX 230110
FLSLSX

Flood Statement
National Weather Service St Louis MO
810 PM CDT Tue Apr 22 2025

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

  Big River at Byrnesville.

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

MOC099-230215-
/O.CAN.KLSX.FL.W.0022.000000T0000Z-250423T0110Z/
/BYRM7.1.ER.250420T1104Z.250421T0630Z.250422T2025Z.UU/
810 PM CDT Tue Apr 22 2025

...FLOOD WARNING IS CANCELLED...

The Flood Warning is cancelled for
  the Big River at Byrnesville.

* ADDITIONAL DETAILS...
  - At 7:45 PM CDT Tuesday the stage was 14.9 feet.
  - Forecast...The river is expected to continue to fall to a
    stage of 8.3 feet on Thursday morning.



&&


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

Big River
  Byrnesville  16.0    14.9    8.3   7.7   7.2   6.7   6.3



&&

LAT...LON 3834 9060 3833 9068 3846 9063 3849 9057


$$

Britt

Area Forecast Discussion...Updated Aviation
National Weather Service Saint Louis MO
628 AM CDT Sun Apr 20 2025

.KEY MESSAGES...

- Showers and thunderstorms are expected to lift northward along a
  warm front this morning. A lull is anticipated late this
  morning into early this afternoon. Pockets of brief, heavy
  rainfall are possible in and around thunderstorms.

- A broken line of strong to severe thunderstorms is expected to
  turn linear late this afternoon over central Missouri and move
  eastward into Illinois by late this evening. Severe thunderstorms
  have the potential to produce large hail, damaging winds and a
  few tornadoes.

- Near to above normal temperatures stretch through the upcoming
  week with dry conditions Monday and Tuesday. The pattern becomes
  active once again from midweek on.

&&

.SHORT TERM...  (Through Late Monday Afternoon)
Issued at 415 AM CDT Sun Apr 20 2025

The meat of the impacts occur today, ramping up late this afternoon
into this evening, when strong to severe thunderstorms are possible.
The strongest thunderstorms will be capable of producing large hail,
damaging winds, a few tornadoes and a quick shot of heavy rainfall.

A broad view of the CONUS shows a persistent ridge over the Atlantic
that extends westward over the Atlantic coastline, surface ridging
over the Great Lakes and the axis to an amplified trough/upper level
low near the New Mexico/Texas border. Upstream showers and
thunderstorms are clearly evident with a broad mass of colder cloud
tops/moisture on IR satellite/water vapor.

Thunderstorms are distributed just ahead of the upper level trough,
which is giving rise to surface low pressure over western/central
Texas. This system is forecast to quickly deepens slingshot to
the northeast through northwestern Missouri and south-central Iowa
by late this evening. Further east, elevated convection becomes
scattered over the mid-Mississippi Valley, stemming from weaker
mid- level impulses well north of the surface boundary.

Through the rest of the morning, the southeastern ridge and
strengthening surface low will act in tandem to lift the stationary
surface boundary northward as a warm front, drawing in warmer air
and dewpoints in the low to mid-60s. Showers and thunderstorms
likely remain scattered with the low level jet focused on the Plains
underneath the right entrance region of the upper jet. Despite
the northward advancement of the warm front, the lack of MUCAPE
(<500 J/kg) and extent of overcast skies will likely inhibit more
widespread development until ongoing convection the our southwest
lifts northeast into the area. As we get behind the warm front,
precipitation chances drop from south to north with a brief period
of mainly dry conditions favored along and south of I-70 after
15z (10 a.m.). Showers and thunderstorms hang on a bit longer over
northeastern Missouri and west-central Illinois with activity
shifting northward by 17z-18z (12 p.m.-1 p.m.). Though the flash
flood watch continues, the threat for flash flooding (aside from
river flooding) is decreasing. Mean rainfall amounts of 1-2 inches
will be fairly representative of much of the area. Even PMM/LPMM
only retain striations of 2-3 inches over the far northwest
sections of the CWA, where much less rain has fallen over the last
several days.

Latest guidance has come into better consensus on the arrival of a
cold front and its preceding dryline late this afternoon through
late this evening. The main change since the last forecast cycle is
a slight delay (1-2 hours) in the arrival of the boundary. Nearly
all guidance is showing the front positioned over the eastern Plains
around 15z (10 a.m.). The front enters western Missouri around
diurnal peak (18z-21z), where the low level jet (45-55 knots) will
be positioned underneath a 500 mb speed max. The recovery in
instability will rely heavily on sky conditions as much of the
guidance holds onto broken/overcast cloud cover. The track of the
surface low, however, keeps the broader convection to the west,
leaving the greater uncertainty over western Missouri. There is a
brief window for clouds to break some ahead of the front, limiting
the potential for instability to build further. Guidance has been
rather consistent in holding MUCAPE valued in the 500-1000 J/kg
range with weakly capped surface instability. Despite this
limiting factor, upward vertical velocity signatures remain strong
and concentrated along and immediately ahead of the front. This
coincides with mid-level lapse rates around 7C, SRH values of 250-
300+ m2/s2, and 0-3 km shear around 50 kts. Additionally, 0-3 km
CAPE values approach 100 J/kg, which can be supportive of tornado
development.

Indications are that initial discrete cells will develop along the
front with the potential for all hazards. As storms propagate
downstream, convection become more linear over central Missouri and
points east. Evolution of this nature do not support hail so much
later in the game, as damaging winds and tornadoes become the
primary threats. Considering the arrival time of 22z-23z over
central Missouri and 00z and later along and east of the Mississippi
River, the line will exhibit the greatest intensity around Columbia,
potentially weakening along and east of the Mississippi River as
diurnal trends take hold. While this is the case, conditions will
have to be monitored closely as helicity track show the support for
tornadoes for a few hours after sunset. More over, should tornadoes
occur, they will result from vorticity embedded within a fast-moving
line, becoming further obscured by heavy rainfall. The best
timeframe for severe potential is approximately 22z through 04z this
evening.

The front clears the area late tonight, bringing an end to the
rainfall late Sunday night into Monday. Near normal temperatures
(mid-60s to low-70s) will be accompanied by dry conditions and
clearing skies Monday.

Maples

&&

.LONG TERM...  (Monday Night through Saturday)
Issued at 415 AM CDT Sun Apr 20 2025

Dry conditions persist Tuesday as surface high pressure centers over
central Illinois and a modest mid-level ridge builds into the mid-
Mississippi Valley. Warm air advection brings warmer air to the
region with highs rising well into the 70s to near 80 degrees.

The patterns turns active again through midweek as zonal flow
introduces multiple shortwaves into the central U.S. A northern
stream system pushes a weakening cold front into the central Plains,
eventually interacting with the advancement of the previously
mentioned warm air advection. This essentially washes the front out
to the north, while second shortwave passes over the Texas
Panhandle. A surface low then develops over Texas and eject
northeast into Missouri through the day Wednesday. Yet another
shortwave follows close behind the initial wave with additional
chances late Wednesday into Thursday. This second wave influences
the boundary to slowly return south as a cold front, increasing
potential for showers and thunderstorms later in the week.

The front then stalls somewhere over the southern portion of the
area with additional shortwave energy moving into the Plains Friday.
Where the boundary lies will be the focus for better potential for
showers and thunderstorms. As was the case in yesterday's update,
precipitation chances are spread through the later half of the week
with a number of details (largely timing and position or existence
of surface features). While guidance seems to be coming into a
little better agreement for the midweeks period, the consecutive run
of shortwaves and precipitation potential will have at least some
influence on the orientation of the pattern. Therefore, specifics
are not yet certain with general trends toward warm and wet weather
through the end of the period.

Maples

&&

.AVIATION...  (For the 12z TAFs through 12z Monday Morning)
Issued at 604 AM CDT Sun Apr 20 2025

A warm front positioned over southern Missouri and Illinois will
lift south to north over the terminals this morning, bringing
showers and a few thunderstorms. Thunderstorms will result in
brief periods of locally heavy rain with reduced visibility.
Surface observations show ceilings lowering to IFR behind the
front, which will briefly lift back to MVFR/VFR behind the
advancing front.

The greatest potential impacts will be late this afternoon through
late this evening with a cold front that bring strong to severe
thunderstorms across the region from west to east. Thunderstorms
with the later round could be strong to severe with the potential
for large hail, damaging winds and tornadoes. The front arrives
around 22z for KCOU/KJEF and 23z-02z for metro terminals, bringing
IFR/LIFR potential along and just behind the cold front. KUIN is
far enough north that most severe potential will remain south of
the terminal, but trends will be monitored in the event amendment
is needed. Strong thunderstorms should pass over terminals
quickly with about 2 hours duration of direct impacts. Ceiling
drop immediately behind the front and then improve shortly
thereafter.

Once the cold front clears each terminal and post-frontal IFR
evacuates, conditions improve to MVFR/VFR.

Maples

&&

.LSX WATCHES/WARNINGS/ADVISORIES...
MO...Flood Watch through late tonight for Audrain MO-Boone MO-
     Callaway MO-Cole MO-Crawford MO-Franklin MO-Gasconade MO-
     Iron MO-Jefferson MO-Lincoln MO-Madison MO-Moniteau MO-
     Montgomery MO-Osage MO-Pike MO-Reynolds MO-Saint Charles MO-
     Saint Francois MO-Saint Louis City MO-Saint Louis MO-Sainte
     Genevieve MO-Warren MO-Washington MO.

IL...Flood Watch through late tonight for Bond IL-Calhoun IL-Clinton
     IL-Fayette IL-Greene IL-Jersey IL-Macoupin IL-Madison IL-
     Marion IL-Monroe IL-Montgomery IL-Randolph IL-Saint Clair
     IL-Washington IL.

&&

WFO LSX

Hazardous Weather Outlook
National Weather Service St Louis MO
422 AM CDT Sun Apr 20 2025

ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027-
034>036-041-042-047>052-059>065-072>075-084-085-099-210930-
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-
422 AM CDT Sun Apr 20 2025

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.

Showers and thunderstorms are expected today through late this
evening. A round of strong to severe thunderstorms is likely late
this afternoon through late this evening. The strongest thunderstorms
will be capable of large hail, damaging winds, and tornadoes.

Locally heavy rain is possible in and around thunderstorms, posing an
isolated threat for flash flooding. A flash flood watch remains in
effect through 7 p.m. this evening.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Showers and thunderstorms are possible Tuesday night through
Friday night.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will likely be needed later today.

Maples