Alert archive / Missouri / River Flood Warnings in 2021

River Flood Warning 18, NWS St. Louis, MO

March 12, 2021Jefferson County, Missouri

NWS St. Louis, MO issued this river flood warning at Mar 12, 2021, 9:57 AM CST for Jefferson County, Missouri. It took effect at Mar 13, 2021, 4:17 AM CST. It was in force for 39 hr.

The area

The outline as issued.

The facts

Issued: Mar 12, 2021, 9:57 AM CST (15:57 UTC)
In effect from: Mar 13, 2021, 4:17 AM CST
Expired: Mar 14, 2021, 8:09 PM CDT
In force: 39 hr
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 15:58 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). The gauge peaked at 18.67 ft at Mar 14, 2021, 4:00 AM CDT.

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.

267 
WGUS43 KLSX 121557 RRA
FLWLSX

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service St Louis MO
957 AM CST Fri Mar 12 2021

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

  Big River at Byrnesville.

River forecasts are based on observed precipitation and forecast 
precipitation for the next 48 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.

  

&&


MOC099-140400-
/O.NEW.KLSX.FL.W.0018.210313T1017Z-210315T2255Z/
/BYRM7.1.ER.210313T1017Z.210314T0600Z.210314T2254Z.UU/
957 AM CST Fri Mar 12 2021

The National Weather Service in St Louis has issued a

* Flood Warning for
  the Big River at Byrnesville.
* From late tonight to Monday afternoon.
* At 8:45 AM CST Friday the stage was 6.1 feet.
* Flood stage is 16.0 feet.
* Minor flooding is forecast.
* Forecast...The river is expected to rise above flood stage late 
  tonight to a crest of 18.0 feet early Sunday morning. It will then 
  fall below flood stage Sunday afternoon.
* Impact...At 18.0 feet, Cedar Hill Road at Cedar Hill and Klondike 
  Road south of Cedar Hill begin to flood near this height.

&&


           Fld   Observed        Forecasts (12 pm CST)
Location   Stg   Stg   Day/Time  Sat   Sun   Mon   Tue   Wed

Big River
Byrnesvill 16.0  6.1   Fri 8 am  17.2  16.9  12.5  9.0   7.9





&&

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

$$

TES

5 follow-up statements

971 
WGUS83 KLSX 130223
FLSLSX

Flood Statement
National Weather Service St Louis MO
823 PM CST Fri Mar 12 2021

...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 48 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.

  

&&


MOC099-141430-
/O.EXT.KLSX.FL.W.0018.210313T1148Z-210316T1115Z/
/BYRM7.1.ER.210313T1148Z.210314T0600Z.210315T1115Z.UU/
823 PM CST Fri Mar 12 2021

...The Flood Warning is now in effect until Tuesday morning...

The Flood Warning continues for
  the Big River at Byrnesville.
* From late tonight to Tuesday morning.
* At 7:45 PM CST Friday the stage was 13.4 feet.
* Flood stage is 16.0 feet.
* Minor flooding is forecast.
* Forecast...The river is expected to rise above flood stage late 
  tonight to a crest of 18.4 feet early Sunday morning. It will then 
  fall below flood stage Monday morning.
* Impact...At 18.1 feet, State Highway BB southeast of Cedar Hill 
  will be closed near this height.

&&


           Fld   Observed        Forecasts (6 pm CST)
Location   Stg   Stg   Day/Time  Sat   Sun   Mon   Tue   Wed

Big River
Byrnesvill 16.0  13.4  Fri 7 pm  18.2  17.5  13.1  8.7   7.5





&&

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

$$

Glass

835 
WGUS83 KLSX 131511 RRA
FLSLSX

Flood Statement
National Weather Service St Louis MO
911 AM CST Sat Mar 13 2021

...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 48 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.

  

&&


MOC099-150315-
/O.EXT.KLSX.FL.W.0018.000000T0000Z-210315T2051Z/
/BYRM7.1.ER.210313T1049Z.210314T0600Z.210314T2051Z.UU/
911 AM CST Sat Mar 13 2021

...The Flood Warning is now in effect until Monday afternoon...

The Flood Warning continues for
  the Big River at Byrnesville.
* Until Monday afternoon.
* At 8:45 AM CST Saturday the stage was 16.7 feet.
* Flood stage is 16.0 feet.
* Minor flooding is occurring and minor flooding is forecast.
* Recent Activity...The maximum river stage in the 24 hours ending 
  at 8:45 AM CST Saturday was 16.7 feet.
* Forecast...The river will rise to 18.6 feet just after midnight 
  tonight. It will then fall below flood stage tomorrow afternoon to 
  12.1 feet and begin rising again Monday morning. It will rise to 
  12.7 feet early Tuesday afternoon. It will then fall again and 
  remain below flood stage.
* Impact...At 19.0 feet, Dutch Creek Road south of Byrnesville and 
  Byrnesville Road near John McKeever Road north of Byrnesville 
  begin to flood.

&&


           Fld   Observed        Forecasts (12 pm CST)
Location   Stg   Stg   Day/Time  Sun   Mon   Tue   Wed   Thu

Big River
Byrnesvill 16.0  16.7  Sat 8 am  17.0  12.2  12.7  11.6  9.2





&&

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

$$

TES

333 
WGUS83 KLSX 140130
FLSLSX

Flood Statement
National Weather Service St Louis MO
730 PM CST Sat Mar 13 2021

...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 48 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.

  

&&


MOC099-151330-
/O.EXT.KLSX.FL.W.0018.000000T0000Z-210316T0712Z/
/BYRM7.1.ER.210313T1049Z.210314T1200Z.210315T0712Z.UU/
730 PM CST Sat Mar 13 2021

...The Flood Warning is now in effect until early Tuesday morning...

The Flood Warning continues for
  the Big River at Byrnesville.
* Until late Monday night.
* At 6:45 PM CST Saturday the stage was 18.0 feet.
* Flood stage is 16.0 feet.
* Minor flooding is occurring and minor flooding is forecast.
* Recent Activity...The maximum river stage in the 24 hours ending 
  at 6:45 PM CST Saturday was 18.1 feet.
* Forecast...The river will rise to 18.6 feet tomorrow morning. It 
  will then fall below flood stage early Monday morning to 11.6 feet 
  and begin rising again Tuesday morning. It will rise to 12.2 feet 
  early Wednesday morning. It will then fall again and remain below 
  flood stage.
* Impact...At 19.0 feet, Dutch Creek Road south of Byrnesville and 
  Byrnesville Road near John McKeever Road north of Byrnesville 
  begin to flood.

&&


           Fld   Observed        Forecasts (6 pm CST)
Location   Stg   Stg   Day/Time  Sun   Mon   Tue   Wed   Thu

Big River
Byrnesvill 16.0  18.0  Sat 6 pm  17.5  12.5  11.9  11.7  9.6





&&

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

$$

MRB

555 
WGUS83 KLSX 141424
FLSLSX

Flood Statement
National Weather Service St Louis MO
924 AM CDT Sun Mar 14 2021

...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 48 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.

  

&&


MOC099-160100-
/O.EXT.KLSX.FL.W.0018.000000T0000Z-210316T0054Z/
/BYRM7.1.ER.210313T1049Z.210314T1030Z.210315T0054Z.UU/
924 AM CDT Sun Mar 14 2021

...The Flood Warning is now in effect until tomorrow evening...

The Flood Warning continues for
  the Big River at Byrnesville.
* Until Monday evening.
* At 8:45 AM CDT Sunday the stage was 18.4 feet.
* Flood stage is 16.0 feet.
* Minor flooding is occurring and minor flooding is forecast.
* Recent Activity...The maximum river stage in the 24 hours ending 
  at 8:45 AM CDT Sunday was 18.7 feet.
* Forecast...The river is expected to fall below flood stage this 
  evening and continue falling to 6.2 feet Sunday morning.
* Impact...At 18.1 feet, State Highway BB southeast of Cedar Hill 
  will be closed near this height.

&&


           Fld   Observed        Forecasts (7 am CDT)
Location   Stg   Stg   Day/Time  Mon   Tue   Wed   Thu   Fri

Big River
Byrnesvill 16.0  18.4  Sun 8 am  12.6  11.4  12.0  9.9   7.8





&&

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

$$

TES

839 
WGUS83 KLSX 150109
FLSLSX

Flood Statement
National Weather Service St Louis MO
809 PM CDT Sun Mar 14 2021

...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 48 hours.

MOC099-150215-
/O.CAN.KLSX.FL.W.0018.000000T0000Z-210315T0109Z/
/BYRM7.1.ER.210313T1049Z.210314T1030Z.210314T2141Z.UU/
809 PM CDT Sun Mar 14 2021

...The Flood Warning for the Big River at Byrnesville has been 
cancelled...

The Flood Warning is cancelled for
  the Big River at Byrnesville.
* At 7:45 PM CDT Sunday the stage was 14.7 feet.
* Flood stage is 16.0 feet.
* Observed river stages continue to fall below flood stage.
* Forecast...The river is expected to fall to 5.8 feet Sunday 
  evening.

&&


           Fld   Observed        Forecasts (7 pm CDT)
Location   Stg   Stg   Day/Time  Mon   Tue   Wed   Thu   Fri

Big River
Byrnesvill 16.0  14.7  Sun 7 pm  10.1  10.5  10.1  8.1   6.9





&&

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

$$

MRB

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 12, 5:55 AM CST	River Flood Warning	LSX	Madison, Saint Francois	7 hr
Mar 12, 9:44 AM CST	River Flood Warning	LSX	Reynolds	52 hr
Mar 12, 9:56 AM CST	River Flood Warning	LSX	Crawford, Washington	65 hr
Mar 12, 9:57 AM CST	River Flood Warning	LSX	Crawford	34 hr

Nearby

River Flood Warnings in Missouri, 2021 Every river flood warning in 2021

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.