Alert archive / Missouri / Flash Flood Warnings in 2021

Flash Flood Warning 24, NWS St. Louis, MO

July 9, 2021Lewis County, Marion County, Missouri

NWS St. Louis, MO issued this flash flood warning at Jul 9, 2021, 9:40 PM CDT for Lewis County, Marion County, Missouri. It was in force for 3 hr. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Jul 9, 2021, 9:40 PM CDT (02:40 UTC)
Expired
Jul 10, 2021, 12:45 AM CDT
In force
3 hr
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Flood severity
None

Counties Lewis County, MO, Marion County, MO

The radar

The St Louis radar (KLSX), 163 km from the middle of the area, began a volume at 02:39 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.

What was reported inside it

TimeReportWhereRemark
Jul 9, 10:00 PM CDTFLASH FLOOD1 Sse Lewistown, MOSEVERAL ROADS HAD SEVERAL INCHES OF FLOWING WATER OVER THEM AROUND THE LEWISTOWN AREA. VIA WGEM.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 2.7 hours before the alert went out and 203 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Davenport, at 00:00Z on 2021-07-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 00:00Z on 2021-07-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 19 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1111 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
19 m²/s²
0-3 km storm-relative helicity
114 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.0

Open this sounding in Storm Lab

The text

As transmitted.

742 
WGUS53 KLSX 100240
FFWLSX
MOC111-127-100545-
/O.NEW.KLSX.FF.W.0024.210710T0240Z-210710T0545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service St Louis MO
940 PM CDT Fri Jul 9 2021

The National Weather Service in St Louis has issued a

* Flash Flood Warning for...
  Lewis County in northeastern Missouri...
  Northeastern Marion County in northeastern Missouri...

* Until 1245 AM CDT.

* At 940 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 2 and 3 inches of rain 
  have fallen. Additional rainfall amounts of 1 to 2 inches are 
  possible in the warned area. Flash flooding is ongoing or expected 
  to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Palmyra, Canton, La Grange, La Belle, Lewistown, Ewing, Maywood, 
  Taylor and Monticello.

This includes the following State Parks...
	Wakonda State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

&&

LAT...LON 4009 9195 4026 9195 4025 9150 4018 9151
      4004 9149 3993 9142 3988 9145 3984 9144
      3981 9138 3978 9136 3971 9156

FLASH FLOOD...RADAR INDICATED

$$

19
1 follow-up statement
974 
WGUS73 KLSX 100542
FFSLSX

Flash Flood Statement
National Weather Service St Louis MO
1242 AM CDT Sat Jul 10 2021

MOC111-127-100552-
/O.EXP.KLSX.FF.W.0024.000000T0000Z-210710T0545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Lewis MO-Marion MO-
1242 AM CDT Sat Jul 10 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 1245 AM CDT EARLY THIS MORNING 
FOR LEWIS AND NORTHEASTERN MARION COUNTIES IN NORTHEASTERN 
MISSOURI...

Flood waters have receded. The heavy rain has ended. Flooding is no 
longer expected to pose a threat. Please continue to heed remaining 
road closures.

A Flash Flood Watch remains in effect until 100 PM CDT Saturday for 
Portions of west central Illinois. Portions of Missouri.

LAT...LON 4009 9195 4026 9195 4025 9150 4018 9151
      4004 9149 3993 9142 3988 9145 3984 9144
      3981 9138 3978 9136 3971 9156

$$

19

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 9, 8:21 PM CDTSevere Thunderstorm WarningLSXLewis, Marion39 min
Jul 9, 8:55 PM CDTSevere Thunderstorm WarningLSXMarion, Ralls50 min
Jul 9, 8:58 PM CDTSevere Thunderstorm WarningLSXSaint Charles, Saint Louis62 min
Jul 9, 9:00 PM CDTSevere Thunderstorm WarningLSXKnox45 min
Jul 9, 9:08 PM CDTAreal Flood AdvisoryLSXLewis, Marion32 min
Jul 9, 9:10 PM CDTSevere Thunderstorm WarningLSXKnox, Lewis, Marion, Shelby65 min
Jul 9, 9:14 PM CDTSevere Thunderstorm WarningLSXSaint Louis, City of Saint Louis48 min
Jul 9, 9:36 PM CDTSevere Thunderstorm WarningLSXMarion, Monroe, Pike, Ralls, Shelby54 min
Jul 9, 10:10 PM CDTSevere Thunderstorm WarningLSXAudrain, Lincoln, Monroe, Pike, Ralls50 min
Jul 9, 10:32 PM CDTSevere Thunderstorm WarningLSXMonroe, Shelby23 min
Jul 9, 10:45 PM CDTSevere Thunderstorm WarningLSXAudrain, Callaway, Lincoln, Montgomery, Pike, Warren45 min
Jul 9, 11:08 PM CDTSevere Thunderstorm WarningLSXCallaway, Franklin, Gasconade, Montgomery, Osage, Warren67 min
Jul 9, 11:10 PM CDTRiver Flood WarningLSXLewis5 days
Jul 9, 11:10 PM CDTRiver Flood WarningLSXLewis32 hr
Jul 9, 11:10 PM CDTRiver Flood WarningLSXMarion4 days
Jul 9, 11:24 PM CDTAreal Flood AdvisoryLSXAudrain, Marion, Monroe, Pike, Ralls, Shelby3 hr
Jul 9, 11:28 PM CDTSevere Thunderstorm WarningLSXLincoln, Montgomery, Saint Charles, Warren47 min
Jul 9, 11:57 PM CDTAreal Flood AdvisoryLSXLincoln, Pike3 hr
Jul 9, 11:59 PM CDTSevere Thunderstorm WarningLSXFranklin, Jefferson, Lincoln, Saint Charles, Saint Louis, Warren and 1 more61 min
Jul 10, 12:26 AM CDTAreal Flood AdvisoryLSXLincoln, Saint Charles3 hr
Jul 10, 12:41 AM CDTAreal Flood AdvisoryLSXSaint Louis, City of Saint Louis3 hr
Jul 10, 12:42 AM CDTSevere Thunderstorm WarningLSXJefferson, Saint Louis, City of Saint Louis63 min
Jul 10, 1:08 AM CDTSevere Thunderstorm WarningLSXJefferson, Sainte Genevieve, Saint Francois, Washington52 min
Jul 10, 1:49 AM CDTRiver Flood WarningLSXMarion18 hr
Jul 10, 1:50 AM CDTSevere Thunderstorm WarningLSXIron, Madison, Sainte Genevieve, Saint Francois, Washington40 min
Jul 10, 2:29 AM CDTSevere Thunderstorm WarningLSXIron, Madison21 min
Jul 10, 6:14 AM CDTRiver Flood WarningLSXMonroe4 days
Jul 10, 8:30 AM CDTRiver Flood WarningLSXLincoln3 days
Jul 10, 2:15 PM CDTAreal Flood AdvisoryLSXSaint Charles, Saint Louis3 hr

Nearby

Flash Flood Warnings in Missouri, 2021Every flash 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.