Alert archive / Missouri / River Flood Warnings in 2023

River Flood Warning 50, NWS St. Louis, MO

August 3, 2023Jefferson County, Missouri

NWS St. Louis, MO issued this river flood warning at Aug 3, 2023, 10:40 AM CDT for Jefferson County, Missouri. It took effect at Aug 4, 2023, 5:53 AM CDT. It was in force for 3 days.

The area

The outline as issued.

The facts

Issued: Aug 3, 2023, 10:40 AM CDT (15:40 UTC)
In effect from: Aug 4, 2023, 5:53 AM CDT
Expired: Aug 7, 2023, 11:35 AM CDT
In force: 3 days
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Flood severity: Minor

County Jefferson County, MO

The radar

The St Louis radar (KLSX), 35 km from the middle of the area, began a volume at 15:43 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The river

Written for the forecast point Big River at Byrnesville (BYRM7).

Action stage: 13 ft
Minor stage: 16 ft
Moderate stage: 20 ft
Major stage: 28 ft

This gauge today: stage, forecast and historic crests

Stage from the USGS instantaneous record for site 07018500, one reading an hour, from a day before the product to a day after it ended. Flood stages are today's.

The text

As transmitted.

523 
WGUS43 KLSX 031540
FLWLSX

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service St Louis MO
1040 AM CDT Thu Aug 3 2023

...The National Weather Service in St Louis MO has issued a Flood 
Warning for the following rivers in Missouri...

  Big River at Byrnesville.

  Meramec River near Eureka.


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.weather.gov/ahps2/index.php?wfo=lsx.

&&

MOC099-050345-
/O.NEW.KLSX.FL.W.0050.230804T1130Z-230807T0151Z/
/BYRM7.1.ER.230804T1130Z.230805T0600Z.230806T0150Z.UU/
1040 AM CDT Thu Aug 3 2023

...FLOOD WARNING IN EFFECT FROM FRIDAY MORNING TO SUNDAY EVENING...

* WHAT...Minor flooding is forecast.

* WHERE...Big River at Byrnesville.

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

* IMPACTS...At 19.3 feet, South Byrnesville Road goes under water 
  near this level.

* ADDITIONAL DETAILS...
  - At 9:45 AM CDT Thursday the stage was 3.8 feet.
  - Bankfull stage is 16.0 feet.
  - Forecast...The river is expected to rise above flood stage
    tomorrow morning to a crest of 19.5 feet early Saturday
    morning. It will then fall below flood stage Saturday
    evening.
  - Flood stage is 16.0 feet.


&&

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

Big River
  Byrnesville  16.0    3.8     16.3  19.3  12.3  8.0   6.1


&&

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


$$

MOC099-189-050345-
/O.NEW.KLSX.FL.W.0051.230805T0120Z-230807T2142Z/
/ERKM7.1.ER.230805T0120Z.230806T0000Z.230806T1541Z.NO/
1040 AM CDT Thu Aug 3 2023

...FLOOD WARNING IN EFFECT FROM FRIDAY EVENING TO MONDAY AFTERNOON...

* WHAT...Minor flooding is forecast.

* WHERE...Meramec River near Eureka.

* WHEN...From Friday evening to Monday afternoon.

* IMPACTS...At 21.0 feet, West Spring River Road becomes inundated 
  at this height.

* ADDITIONAL DETAILS...
  - At 10:00 AM CDT Thursday the stage was 5.7 feet.
  - Bankfull stage is 18.0 feet.
  - Forecast...The river is expected to rise above flood stage
    tomorrow evening to a crest of 21.0 feet Saturday evening. It
    will then fall below flood stage late Sunday morning.
  - Flood stage is 19.0 feet.


&&

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

Meramec River
  Eureka       19.0    5.7     15.5  20.5  19.8  14.7  9.0


&&

LAT...LON 3845 9065 3855 9063 3855 9056 3850 9056


$$

Fuchs

8 follow-up statements

376 
WGUS83 KLSX 040217
FLSLSX

Flood Statement
National Weather Service St Louis MO
917 PM CDT Thu Aug 3 2023

...The Flood Warning is extended 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.

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.weather.gov/ahps2/index.php?wfo=lsx.

&&

MOC099-051430-
/O.EXT.KLSX.FL.W.0050.230804T1053Z-230807T0224Z/
/BYRM7.1.ER.230804T1053Z.230805T0600Z.230806T0224Z.UU/
917 PM CDT Thu Aug 3 2023

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

* WHAT...Minor flooding is forecast.

* WHERE...Big River at Byrnesville.

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

* IMPACTS...At 19.3 feet, South Byrnesville Road goes under water 
  near this level.

* ADDITIONAL DETAILS...
  - At 8:45 PM CDT Thursday the stage was 10.7 feet.
  - Bankfull stage is 16.0 feet.
  - Forecast...The river is expected to rise above flood stage
    late tonight to a crest of 19.5 feet early Saturday morning.
    It will then fall below flood stage late Saturday evening.
  - Flood stage is 16.0 feet.


&&

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

Big River
  Byrnesville  16.0    10.7    19.3  12.3  7.9   6.0   5.3


&&

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


$$

Carney

238 
WGUS83 KLSX 041501
FLSLSX

Flood Statement
National Weather Service St Louis MO
1001 AM CDT Fri Aug 4 2023

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

  Big River at Byrnesville.

  Meramec River near Eureka.

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

  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.weather.gov/ahps2/index.php?wfo=lsx.

&&

MOC099-060315-
/O.EXT.KLSX.FL.W.0050.000000T0000Z-230808T0310Z/
/BYRM7.1.ER.230804T1800Z.230806T0600Z.230807T0310Z.UU/
1001 AM CDT Fri Aug 4 2023

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

* WHAT...Minor flooding is forecast.

* WHERE...Big River at Byrnesville.

* WHEN...Until late Monday evening.

* IMPACTS...At 19.3 feet, South Byrnesville Road goes under water 
  near this level.

* ADDITIONAL DETAILS...
  - At 9:45 AM CDT Friday the stage was 15.6 feet.
  - Bankfull stage is 16.0 feet.
  - Forecast...The river is expected to rise above flood stage
    this afternoon and crest near 19.5 feet Sunday morning.
  - Flood stage is 16.0 feet.


&&

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

Big River
  Byrnesville  16.0    15.6    18.7  19.2  13.3  8.8   7.2


&&

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


$$

MOC071-060315-
/O.EXT.KLSX.FL.W.0046.000000T0000Z-230807T1620Z/
/UNNM7.1.ER.230803T1910Z.230805T1200Z.230806T1020Z.NO/
1001 AM CDT Fri Aug 4 2023

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

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

* WHERE...Bourbeuse River at Union.

* WHEN...Until late Monday morning.

* IMPACTS...At 19.8 feet, Near this height, Missouri State Route UU 
  is closed in both directions.

* ADDITIONAL DETAILS...
  - At 9:30 AM CDT Friday the stage was 17.2 feet.
  - Bankfull stage is 14.0 feet.
  - Forecast...The river is forecast to crest near 19.1 feet
    tomorrow morning.
  - Flood stage is 15.0 feet.


&&

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

Bourbeuse River
  Union          15.0    17.2    19.1  14.5  13.0  9.7   5.5


&&

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


$$

MOC099-189-060315-
/O.EXT.KLSX.FL.W.0051.230805T0243Z-230808T1822Z/
/ERKM7.1.ER.230805T0243Z.230806T1200Z.230807T1222Z.NO/
1001 AM CDT Fri Aug 4 2023

...FLOOD WARNING NOW IN EFFECT FROM THIS EVENING TO EARLY TUESDAY 
AFTERNOON...

* WHAT...Minor flooding is forecast.

* WHERE...Meramec River near Eureka.

* WHEN...From this evening to early Tuesday afternoon.

* IMPACTS...At 21.2 feet, Hunters Ford Road is closed near this 
  height.

* ADDITIONAL DETAILS...
  - At 9:30 AM CDT Friday the stage was 16.3 feet.
  - Bankfull stage is 18.0 feet.
  - Forecast...The river is expected to rise above flood stage
    late this evening and crest near 21.5 feet Sunday morning.
  - Flood stage is 19.0 feet.


&&

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

Meramec River
  Eureka       19.0    16.3    20.3  21.5  19.1  13.4  10.5


&&

LAT...LON 3845 9065 3855 9063 3855 9056 3850 9056


$$

Gosselin

820 
WGUS83 KLSX 050248
FLSLSX

Flood Statement
National Weather Service St Louis MO
948 PM CDT Fri Aug 4 2023

...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...

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.weather.gov/ahps2/index.php?wfo=lsx.

&&

MOC099-061500-
/O.EXT.KLSX.FL.W.0050.000000T0000Z-230807T1607Z/
/BYRM7.1.ER.230804T1620Z.230805T1800Z.230806T1607Z.UU/
948 PM CDT Fri Aug 4 2023

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

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

* WHERE...Big River at Byrnesville.

* WHEN...Until late Monday morning.

* IMPACTS...At 19.3 feet, South Byrnesville Road goes under water 
  near this level.

* ADDITIONAL DETAILS...
  - At 8:45 PM CDT Friday the stage was 18.0 feet.
  - Bankfull stage is 16.0 feet.
  - Recent Activity...The maximum river stage in the 24 hours
    ending at 8:45 PM CDT Friday was 18.0 feet.
  - Forecast...The river is expected to rise to a crest of 19.5
    feet early tomorrow afternoon. It will then fall below flood
    stage late Sunday morning.
  - Flood stage is 16.0 feet.


&&

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

Big River
  Byrnesville  16.0    18.0    17.1  10.3  7.3   6.3   5.9


&&

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


$$

Carney

378 
WGUS83 KLSX 051535
FLSLSX

Flood Statement
National Weather Service St Louis MO
1035 AM CDT Sat Aug 5 2023

...The Flood Warning is extended 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...

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.

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.weather.gov/ahps2/index.php?wfo=lsx.

&&

MOC099-070345-
/O.EXT.KLSX.FL.W.0050.000000T0000Z-230807T2236Z/
/BYRM7.1.ER.230804T1620Z.230805T1800Z.230806T2236Z.UU/
1035 AM CDT Sat Aug 5 2023

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

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

* WHERE...Big River at Byrnesville.

* WHEN...Until Monday afternoon.

* IMPACTS...At 19.3 feet, South Byrnesville Road goes under water 
  near this level.

* ADDITIONAL DETAILS...
  - At 9:45 AM CDT Saturday the stage was 19.5 feet.
  - Bankfull stage is 16.0 feet.
  - Recent Activity...The maximum river stage in the 24 hours
    ending at 9:45 AM CDT Saturday was 19.5 feet.
  - Forecast...The river is expected to rise to a crest of 19.7
    feet this afternoon. It will then fall below flood stage
    tomorrow afternoon.
  - Flood stage is 16.0 feet.


&&

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

Big River
  Byrnesville  16.0    19.5    17.9  12.3  8.2   6.8   6.3


&&

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


$$

Maples

611 
WGUS83 KLSX 060214 RRA
FLSLSX

Flood Statement
National Weather Service St Louis MO
914 PM CDT Sat Aug 5 2023

...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...

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.weather.gov/ahps2/index.php?wfo=lsx.

&&

MOC099-071415-
/O.EXT.KLSX.FL.W.0050.000000T0000Z-230807T2100Z/
/BYRM7.1.ER.230804T1620Z.230805T2015Z.230806T2100Z.UU/
914 PM CDT Sat Aug 5 2023

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

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

* WHERE...Big River at Byrnesville.

* WHEN...Until Monday afternoon.

* IMPACTS...At 19.3 feet, South Byrnesville Road goes under water 
  near this level.

* ADDITIONAL DETAILS...
  - At 8:45 PM CDT Saturday the stage was 19.6 feet.
  - Bankfull stage is 16.0 feet.
  - Recent Activity...The maximum river stage in the 24 hours
    ending at 8:45 PM CDT Saturday was 19.7 feet.
  - Forecast...The river is expected to fall below flood stage
    tomorrow afternoon and continue falling to 5.6 feet Saturday,
    August 12.
  - 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    19.6    11.5  8.2   6.9   6.3   6.0


&&

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


$$

Carney

130 
WGUS83 KLSX 061531 RRA
FLSLSX

Flood Statement
National Weather Service St Louis MO
1031 AM CDT Sun Aug 6 2023

...The Flood Warning is extended 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...

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.weather.gov/ahps2/index.php?wfo=lsx.

&&

MOC099-080045-
/O.EXT.KLSX.FL.W.0050.000000T0000Z-230808T0043Z/
/BYRM7.1.ER.230804T1620Z.230805T2015Z.230807T0043Z.UU/
1031 AM CDT Sun Aug 6 2023

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

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

* WHERE...Big River at Byrnesville.

* WHEN...Until tomorrow evening.

* 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 19.0 feet.
  - Bankfull stage is 16.0 feet.
  - Recent Activity...The maximum river stage in the 24 hours
    ending at 9:45 AM CDT Sunday was 19.6 feet.
  - Forecast...The river is expected to fall below flood stage
    this evening and continue falling to 5.4 feet Sunday, August
    13.
  - 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    19.0    11.5  8.1   6.9   6.3   6.0


&&

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


$$

Maples

184 
WGUS83 KLSX 070244
FLSLSX

Flood Statement
National Weather Service St Louis MO
944 PM CDT Sun Aug 6 2023

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

  Meramec River at Valley Park.

  Meramec River near Eureka.

  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.weather.gov/ahps2/index.php?wfo=lsx.

&&

MOC099-189-081245-
/O.EXT.KLSX.FL.W.0053.000000T0000Z-230808T1245Z/
/VLLM7.1.ER.230806T1050Z.230806T2200Z.230807T0645Z.NO/
944 PM CDT Sun Aug 6 2023

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

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

* WHERE...Meramec River at Valley Park.

* WHEN...Until Tuesday morning.

* IMPACTS...At 19.0 feet, The south riverward side of Marshall Road 
  begins to flood.

* ADDITIONAL DETAILS...
  - At 9:00 PM CDT Sunday the stage was 18.4 feet.
  - Bankfull stage is 17.0 feet.
  - Recent Activity...The maximum river stage in the 24 hours
    ending at 9:00 PM CDT Sunday was 18.4 feet.
  - Forecast...The river is expected to fall below flood stage
    just after midnight tonight and continue falling to -0.8 feet
    Saturday evening.
  - Flood stage is 18.0 feet.


&&

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

Meramec River
  Valley Park  18.0    18.4    8.1   1.9   0.9   0.3   -0.5


&&

LAT...LON 3853 9056 3855 9056 3857 9043 3854 9043


$$

MOC099-189-081445-
/O.EXT.KLSX.FL.W.0051.000000T0000Z-230808T1634Z/
/ERKM7.1.ER.230805T0407Z.230806T1730Z.230807T1034Z.NO/
944 PM CDT Sun Aug 6 2023

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

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

* WHERE...Meramec River near Eureka.

* WHEN...Until late Tuesday morning.

* IMPACTS...At 21.0 feet, West Spring River Road becomes inundated 
  at this height.

* ADDITIONAL DETAILS...
  - At 9:00 PM CDT Sunday the stage was 21.0 feet.
  - Bankfull stage is 18.0 feet.
  - Recent Activity...The maximum river stage in the 24 hours
    ending at 9:00 PM CDT Sunday was 21.5 feet.
  - Forecast...The river is expected to fall below flood stage
    late tonight and continue falling to 5.1 feet Saturday
    evening.
  - Flood stage is 19.0 feet.


&&

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

Meramec River
  Eureka       19.0    21.0    9.5   6.8   6.3   5.8   5.3


&&

LAT...LON 3845 9065 3855 9063 3855 9056 3850 9056


$$

MOC099-080630-
/O.EXT.KLSX.FL.W.0050.000000T0000Z-230808T0617Z/
/BYRM7.1.ER.230804T1620Z.230805T2015Z.230807T0617Z.UU/
944 PM CDT Sun Aug 6 2023

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

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

* WHERE...Big River at Byrnesville.

* WHEN...Until early Tuesday morning.

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

* ADDITIONAL DETAILS...
  - At 8:45 PM CDT Sunday the stage was 16.6 feet.
  - Bankfull stage is 16.0 feet.
  - Recent Activity...The maximum river stage in the 24 hours
    ending at 8:45 PM CDT Sunday was 19.0 feet.
  - Forecast...The river is expected to fall below flood stage
    just after midnight tonight and continue falling to 5.3 feet
    Sunday, August 13.
  - 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    16.6    8.0   6.9   6.4   6.1   5.8


&&

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


$$

Britt

794 
WGUS83 KLSX 071635 RRA
FLSLSX

Flood Statement
National Weather Service St Louis MO
1135 AM CDT Mon Aug 7 2023

...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.

MOC099-071745-
/O.CAN.KLSX.FL.W.0050.000000T0000Z-230807T1635Z/
/BYRM7.1.ER.230804T1620Z.230805T2015Z.000000T0000Z.UU/
1135 AM CDT Mon Aug 7 2023

...FLOOD WARNING IS CANCELLED...

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

* ADDITIONAL DETAILS...
  - At 10:45 AM CDT Monday the stage was 8.2 feet.
  - Bankfull stage is 16.0 feet.
  - Forecast...The river is expected to fall to 5.1 feet Monday,
    August 14.


&&

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

Big River
  Byrnesville  16.0    8.2     6.2   5.8   5.6   5.5   5.3


&&

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


$$

Maples

What forecasters said that day

The local office's own words before this river flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS St. Louis, MO wrote its last area forecast discussion before this river flood warning went out at Aug 3, 10:03 AM CDT, 37 minutes earlier.

Area forecast discussion, Aug 3, 10:03 AM CDT, 37 minutes before

Area Forecast Discussion...Updated
National Weather Service Saint Louis MO
1003 AM CDT Thu Aug 3 2023

.UPDATE...
Issued at 948 AM CDT Thu Aug 3 2023

Trends in IR satellite imagery show a broad mass of colder cloud
tops moving into far southeast Missouri and southern Illinois this
morning. Depth and coverage decreases with northward travel,
though low stratus and episodic visibility reductions continue to
be observed across sections of northern Missouri into west-central
Illinois. Radar shows decreasing coverage of showers and thunderstorms
with rapidly diminishing coverage in heavy rainfall. Therefore,
the flood watch has been allowed to expire. Focus will shift to
the late afternoon period with CAMs beginning to latch onto an MCV
giving rise to shower and thunderstorm development late this
afternoon/evening. Activity does not initially looks as well
organized nor seem to reside over one particular area for too
long. However, localized heavy rainfall that impacts similar areas
that have been impacted last night into the morning will be a
concern later tonight into tonight if convection materializes.

Maples

&&

.SHORT TERM...  (Through Late Friday Afternoon)
Issued at 322 AM CDT Thu Aug 3 2023

Key Message:

Ongoing training of storms early this morning with activity
extending as far west as north central Kansas. So will keep Flood
Watch going through 15z today with widespread 1-3" rainfall
totals still expected in the flash flood watch area, with a few
locations already in excess of 6" (Southern Moniteau/Cole
counties) as of 08z Thursday. The heaviest rain will be in a NW-SE
axis from near Columbia to Farmington.

(Today - Friday)

With the low level jet (25-35kt) veering to the west, it will become
parallel to the mean 850-300mb flow, so this favors a continued
upwind propagation and cell training for a while longer. Then
between 12z and 15z, the low level jet will veer to the northwest
and weaken with activity quickly tapering off.

Even with rain tapering off, the effective front will linger across
southern portions of Missouri through the rest of the day. North of
this boundary, the latest HREF ensemble run has surface based CAPEs
between 1500-3000 J/kg and mean PWs around 2 inches. So plenty of
instability and moisture across the region, thus expect scattered
showers and storms will develop by late afternoon for portions of
central and southeast Missouri. The rest of the forecast area should
remain dry.

By tonight, some of the latest CAMs indicate that another MCS will
develop over south central and southeast Missouri. However, the
majority of the CAMs do not develop an MCS or have one develop
further to our southeast. Also, even with PMM/LPMM qpf values
indicating isolated 1-2" amounts of rain in southern portions of the
forecast area tonight, the latest HREF has more of a spread when it
comes to QPF amounts, so confidence is low on another heavy rain
event for portions of our area at this time. Will need to keep eye
out on the later model runs to see if adjustments need to be made
and/or possible flood watch for tonight.

On Friday, even though mean surface based CAPE values will be a bit
lower (1000-1500 J/kg) with mean PWs less than 2 inches as well as a
lingering frontal boundary across region, only expect a low end
chance of showers and storms once again due to weaker mid and upper
level flow.

Highs today and Friday will be near normal while lows tonight will
be a bit above normal in the upper 60s to mid 70s.

Byrd

.LONG TERM...  (Friday Night through Wednesday)
Issued at 322 AM CDT Thu Aug 3 2023

No major changes as the latest deterministic as well as ensembles
keep chances of showers and storms through the weekend, as
several shortwaves slide along the zonal flow aloft. However, with
weaker mid level flow and little to no low level jet each night,
precipitation chances will be on the lower side.

Otherwise, after near normal temperatures on Saturday and Sunday,
cooler than normal temperatures through the work week. This is due
to an upper level ridge building over the western CONUS once again
putting our area in northwest flow aloft.

Byrd

&&

.AVIATION...  (For the 12z TAFs through 12z Friday Morning)
Issued at 657 AM CDT Thu Aug 3 2023

A corridor of showers and thunderstorms extends through central to
southeastern MO, impacting KCOU and KJEF and remaining south of St.
Louis metro terminals. This brief reductions to MVFR to IFR
visibilities will be possible in thunderstorms over the next couple
hours, before gradual weakening to showers and then eventual
dissipation occurs through the rest of the morning. IFR stratus, and
additionally IFR fog at KUIN, extends across northeastern MO/west-
central IL to the south near the I-70 corridor. It is uncertain how
far southward the IFR stratus will continue to advance, but at least
a period of IFR flight conditions is likely at KSTL and KSUS.

Stratus should lift and begin scattering through the day with
improving flight conditions, although it is possible that
improvement occurs more slowly than advertise in the TAF. A few
showers and thunderstorms are again possible by late this afternoon,
but the relatively greater threat for showers and thunderstorms will
be overnight at KCOU and KJEF. Lastly, winds are anticipated to be
generally light through the TAF period.

Pfahler

&&

.PRELIMINARY POINT TEMPS/POPS...
Saint Louis     86  74  87  74 /  50  20  20  40
Quincy          84  70  86  71 /  10  10   5  40
Columbia        85  72  88  72 /  70  30  30  50
Jefferson City  88  73  90  74 /  80  40  30  50
Salem           84  69  88  70 /  60  20  20  20
Farmington      89  70  89  71 / 100  40  30  30

&&

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

WFO LSX

Hazardous weather outlook, Aug 3, 3:50 AM CDT, 6 hours 50 minutes before

Hazardous Weather Outlook
National Weather Service St Louis MO
350 AM CDT Thu Aug 3 2023

ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027-
034>036-041-042-047>052-059>065-072>075-084-085-099-041200-
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-
350 AM CDT Thu Aug 3 2023

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.

Flash Flood Watch is in effect for parts of Missouri and Illinois
through mid morning as thunderstorms producing heavy rainfall rates
will persist.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Thunderstorms are possible each day through Monday. There is another
chance of thunderstorms on Wednesday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will likely be needed.

Byrd

In the hours before

Local storm report, Aug 3, 8:52 AM CDT, 1 hour 48 minutes before

Preliminary Local Storm Report
National Weather Service St Louis MO
852 AM CDT Thu Aug 3 2023

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

0750 AM     Rain             Owensville              38.35N 91.50W
08/03/2023  M7.20 inch       Gasconade          MO   Broadcast Media

            2-day total.

&&

JPG

Local storm report, Aug 3, 9:18 AM CDT, 1 hour 22 minutes before

Preliminary Local Storm Report
National Weather Service St Louis MO
918 AM CDT Thu Aug 3 2023

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

0515 AM     Tstm Wnd Dmg     5 NNE Old Mines         38.08N 90.74W
08/03/2023                   Washington         MO   911 Call Center

            Several trees down across highway 47.

&&

Local storm report, Aug 3, 9:49 AM CDT, 51 minutes before

Preliminary Local Storm Report
National Weather Service St Louis MO
949 AM CDT Thu Aug 3 2023

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

0321 AM     Tstm Wnd Dmg     2 NE Easley             38.82N 92.36W
08/03/2023                   Boone              MO   Emergency Mngr

            Multiple trees down along Route N. Time
            estimated from radar.

&&

JPG

Local storm report, Aug 3, 10:10 AM CDT, 30 minutes before

Preliminary Local Storm Report
National Weather Service St Louis MO
1010 AM CDT Thu Aug 3 2023

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

0328 AM     Tstm Wnd Dmg     2 ESE Easley            38.79N 92.35W
08/03/2023                   Boone              MO   Emergency Mngr

            Tree down on Highway MM near Harold
            Cunningham Drive.

&&

JPG

Local storm report, Aug 3, 10:13 AM CDT, 27 minutes before

Preliminary Local Storm Report
National Weather Service St Louis MO
1013 AM CDT Thu Aug 3 2023

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

0630 AM     Rain             Desloge                 37.87N 90.52W
08/03/2023  M6.03 inch       St. Francois       MO   Public

&&

JPG

Local storm report, Aug 3, 10:17 AM CDT, 23 minutes before

Preliminary Local Storm Report
National Weather Service St Louis MO
1017 AM CDT Thu Aug 3 2023

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

0815 AM     Rain             4 NNW Mokane            38.73N 91.90W
08/03/2023  M9.32 inch       Callaway           MO   Public

            2-day total.

&&

JPG

The office that day

Everything else NWS St. Louis, MO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 2, 7:36 PM CDT	Severe Thunderstorm Warning	LSX	Callaway, Cole, Moniteau	39 min
Aug 2, 8:07 PM CDT	Areal Flood Advisory	LSX	Cole, Moniteau	2 hr
Aug 2, 8:10 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LSX	Cole, Osage	65 min
Aug 2, 8:29 PM CDT	Flash Flood Warning	LSX	Callaway, Cole, Moniteau, Osage	4 hr
Aug 2, 8:30 PM CDT	Tornado Warning	LSX	Moniteau	16 min
Aug 2, 9:28 PM CDT	Areal Flood Advisory	LSX	Franklin, Gasconade	23 min
Aug 2, 9:42 PM CDT	Severe Thunderstorm Warning	LSX	Crawford, Gasconade	63 min
Aug 2, 9:51 PM CDT	Flash Flood Warning	LSX	Franklin, Gasconade	3 hr
Aug 2, 9:59 PM CDT	Severe Thunderstorm Warning	LSX	Washington	61 min
Aug 2, 10:21 PM CDT	Areal Flood Advisory	LSX	Crawford, Washington	3 hr
Aug 2, 10:29 PM CDT	Severe Thunderstorm Warning	LSX	Iron, Madison, Reynolds, Sainte Genevieve, Saint Francois	61 min
Aug 2, 10:41 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LSX	Washington	49 min
Aug 2, 10:45 PM CDT	River Flood Warning	LSX	Franklin	3 days
Aug 2, 11:18 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LSX	Madison	57 min
Aug 2, 11:25 PM CDT	Severe Thunderstorm Warning	LSX	Cole, Moniteau	38 min
Aug 3, 12:03 AM CDT	Severe Thunderstorm Warning	LSX	Iron, Reynolds	57 min
Aug 3, 12:13 AM CDT	Flash Flood Warning Considerable damage threat	LSX	Cole, Moniteau	4 hr
Aug 3, 12:26 AM CDT	Severe Thunderstorm Warning	LSX	Iron, Reynolds	49 min
Aug 3, 1:33 AM CDT	Flash Flood Warning	LSX	Boone, Callaway, Franklin, Gasconade, Moniteau, Osage	4 hr
Aug 3, 1:46 AM CDT	Severe Thunderstorm Warning	LSX	Callaway, Osage	22 min
Aug 3, 3:05 AM CDT	Flash Flood Warning Considerable damage threat	LSX	Boone, Callaway, Moniteau, Osage	6 hr
Aug 3, 4:52 AM CDT	Severe Thunderstorm Warning	LSX	Crawford, Franklin, Jefferson, Washington	38 min
Aug 3, 6:56 AM CDT	River Flood Warning	LSX	Crawford, Washington	5 hr
Aug 3, 8:51 AM CDT	Flash Flood Warning	LSX	Madison, Sainte Genevieve, Saint Francois	4 hr
Aug 3, 10:36 AM CDT	River Flood Warning	LSX	Cole	35 hr
Aug 3, 10:36 AM CDT	River Flood Warning	LSX	Osage	11 hr
Aug 3, 10:40 AM CDT	River Flood Warning	LSX	Jefferson, Saint Louis	4 days

Nearby

River Flood Warnings in Missouri, 2023 Every river flood warning in 2023

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive; the gauge from the NWS water service and the USGS.