Alert archive / Missouri / River Flood Warnings in 2021

River Flood Warning 54, NWS St. Louis, MO

March 19, 2021Jefferson County, Saint Louis County, Missouri

NWS St. Louis, MO issued this river flood warning at Mar 19, 2021, 11:23 AM CDT for Jefferson County, Saint Louis County, Missouri. It took effect at Mar 20, 2021, 10:36 AM CDT. It was in force for 17 min.

The area

The outline as issued.

The facts

Issued: Mar 19, 2021, 11:23 AM CDT (16:23 UTC)
In effect from: Mar 20, 2021, 10:36 AM CDT
Expired: Mar 20, 2021, 10:53 AM CDT
In force: 17 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Flood severity: Minor

Counties Jefferson County, MO, Saint Louis County, MO

The radar

The St Louis radar (KLSX), 30 km from the middle of the area, began a volume at 16:23 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 Meramec River at Fenton (FNNM7). The gauge peaked at 22.23 ft at Mar 20, 2021, 7:00 PM CDT.

Action stage: 21 ft
Minor stage: 23 ft
Moderate stage: 29 ft
Major stage: 32 ft

This gauge today: stage, forecast and historic crests

Stage from the USGS instantaneous record for site 07019210, 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.

221 
WGUS43 KLSX 191623
FLWLSX

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service St Louis MO
1123 AM CDT Fri Mar 19 2021

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

  Meramec River at Valley Park.

  Meramec River In Fenton.

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.

  

&&


MOC099-189-210430-
/O.NEW.KLSX.FL.W.0053.210320T0800Z-210323T0300Z/
/VLLM7.1.ER.210320T0800Z.210321T0000Z.210321T2100Z.NO/
1123 AM CDT Fri Mar 19 2021

The National Weather Service in St Louis has issued a

* Flood Warning for
  the Meramec River at Valley Park.
* From late tonight to Monday evening.
* At 11:00 AM CDT Friday the stage was 15.7 feet.
* Flood stage is 18.0 feet.
* Minor flooding is forecast.
* Forecast...The river is expected to rise above flood stage late 
  tonight to a crest of 19.0 feet tomorrow evening. It will then 
  fall below flood stage Sunday afternoon.
* Impact...At 19.0 feet, The south riverward side of Marshall Road 
  begins to flood.

&&


             Fld   Observed        Forecasts (1 pm CDT)
Location     Stg   Stg   Day/Time  Sat   Sun   Mon   Tue   Wed

Meramec River
Valley Park  18.0  15.7  Fri 11 am 18.8  18.3  15.7  12.5  9.4





&&

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

$$

MOC099-189-210430-
/O.NEW.KLSX.FL.W.0054.210320T1536Z-210323T1800Z/
/FNNM7.1.ER.210320T1536Z.210321T0600Z.210322T1200Z.NO/
1123 AM CDT Fri Mar 19 2021

The National Weather Service in St Louis has issued a

* Flood Warning for
  the Meramec River In Fenton.
* From Saturday morning to Tuesday afternoon.
* At 10:15 AM CDT Friday the stage was 19.6 feet.
* Flood stage is 23.0 feet.
* Minor flooding is forecast.
* Forecast...The river is expected to rise above flood stage late 
  tomorrow morning to a crest of 23.8 feet early Sunday morning. It 
  will then fall below flood stage Monday morning.

&&


             Fld   Observed        Forecasts (1 pm CDT)
Location     Stg   Stg   Day/Time  Sat   Sun   Mon   Tue   Wed

Meramec River
Fenton       23.0  19.6  Fri 10 am 23.2  23.8  22.5  19.4  16.3





&&

LAT...LON 3854 9045 3854 9042 3848 9039 3848 9045

$$

Fuchs

2 follow-up statements

675 
WGUS83 KLSX 200057
FLSLSX

Flood Statement
National Weather Service St Louis MO
757 PM CDT Fri Mar 19 2021

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

  Meramec River at Valley Park.

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

  Meramec River near Arnold.

  Meramec River In Fenton.

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.

  

&&


MOC099-189-211300-
/O.EXT.KLSX.FL.W.0047.000000T0000Z-210325T1930Z/
/ARNM7.1.ER.210319T0020Z.210321T0600Z.210324T1330Z.NO/
757 PM CDT Fri Mar 19 2021

...The Flood Warning is now in effect until early Thursday 
afternoon...

The Flood Warning continues for
  the Meramec River near Arnold.
* Until Thursday afternoon.
* At 7:30 PM CDT Friday the stage was 28.3 feet.
* Flood stage is 24.0 feet.
* Minor flooding is occurring and minor flooding is forecast.
* Recent Activity...The maximum river stage in the 24 hours ending 
  at 7:30 PM CDT Friday was 28.3 feet.
* Forecast...The river is expected to rise to a crest of 30.5 feet 
  early Sunday morning. It will then fall below flood stage 
  Wednesday morning.
* Impact...At 30.0 feet, Wells Road below Suson Woods begins 
  flooding at this height.

&&


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

Meramec River
Arnold       24.0  28.3  Fri 7 pm  30.4  30.3  28.3  25.7  22.7





&&

LAT...LON 3848 9043 3848 9039 3846 9032 3841 9034
      3845 9043

$$

MOC099-189-211300-
/O.EXT.KLSX.FL.W.0053.210320T0800Z-210323T1200Z/
/VLLM7.1.ER.210320T0800Z.210321T0000Z.210322T0600Z.NO/
757 PM CDT Fri Mar 19 2021

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

The Flood Warning continues for
  the Meramec River at Valley Park.
* From late tonight to Tuesday morning.
* At 7:30 PM CDT Friday the stage was 17.1 feet.
* Flood stage is 18.0 feet.
* Minor flooding is forecast.
* Forecast...The river is expected to rise above flood stage late 
  tonight to a crest of 19.0 feet tomorrow evening. It will then 
  fall below flood stage early Monday morning.
* Impact...At 19.0 feet, The south riverward side of Marshall Road 
  begins to flood.

&&


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

Meramec River
Valley Park  18.0  17.1  Fri 7 pm  19.0  18.3  16.0  13.0  10.5





&&

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

$$

MOC099-189-211300-
/O.EXT.KLSX.FL.W.0054.210321T1200Z-210323T0000Z/
/FNNM7.1.ER.210321T1200Z.210321T1200Z.210321T1800Z.NO/
757 PM CDT Fri Mar 19 2021

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

The Flood Warning continues for
  the Meramec River In Fenton.
* From Sunday morning to Monday evening.
* At 7:31 PM CDT Friday the stage was 20.9 feet.
* Flood stage is 23.0 feet.
* Minor flooding is forecast.
* Forecast...The river is expected to rise above flood stage Sunday 
  morning to a crest of 23.0 feet Sunday morning. It will then fall 
  below flood stage early Sunday afternoon.
* Impact...At 22.9 feet, At this height, the entire boat ramp path 
  at Minnie Ha Ha Park will be submerged.

&&


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

Meramec River
Fenton       23.0  20.9  Fri 7 pm  22.7  22.8  21.0  18.2  15.4





&&

LAT...LON 3854 9045 3854 9042 3848 9039 3848 9045

$$

Maples

037 
WGUS83 KLSX 201553
FLSLSX

Flood Statement
National Weather Service St Louis MO
1053 AM CDT Sat Mar 20 2021

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

  Meramec River In Fenton.

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

MOC099-189-201700-
/O.CAN.KLSX.FL.W.0054.210321T1200Z-210320T1553Z/
/FNNM7.1.ER.000000T0000Z.000000T0000Z.000000T0000Z.NO/
1053 AM CDT Sat Mar 20 2021

...The Flood Warning for the Meramec River In Fenton has been 
cancelled...

The Flood Warning is cancelled for
  the Meramec River In Fenton.
* At 10:31 AM CDT Saturday the stage was 22.0 feet.
* Flood stage is 23.0 feet.
* Forecast...The river is expected to stay just below flood stage 
  and to crest at 22.4 feet just after midnight tonight.

&&


             Fld   Observed        Forecasts (1 pm CDT)
Location     Stg   Stg   Day/Time  Sun   Mon   Tue   Wed   Thu

Meramec River
Fenton       23.0  22.0  Sat 10 am 22.0  20.1  17.3  14.5  12.3





&&

LAT...LON 3854 9045 3854 9042 3848 9039 3848 9045

$$

Britt

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 19, 11:23 AM CDT	River Flood Warning	LSX	Jefferson, Saint Louis	3 days

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.