Alert archive / Missouri / Areal Flood Warnings in 2021

Areal Flood Warning 7, NWS St. Louis, MO

June 26, 20216 counties in Missouri

NWS St. Louis, MO issued this areal flood warning at Jun 26, 2021, 7:34 AM CDT for 6 counties in Missouri. It was in force for 8 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Jun 26, 2021, 7:34 AM CDT (12:34 UTC)
Expired
Jun 26, 2021, 3:15 PM CDT
In force
8 hr
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Flood severity
None

Counties Franklin County, MO, Gasconade County, MO, Lincoln County, MO, Montgomery County, MO, Saint Charles County, MO, Warren County, MO

The radar

The St Louis radar (KLSX), 50 km from the middle of the area, began a volume at 12:36 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 nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 0.6 hours before the alert went out and 263 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, Lincoln, IL at 12:00Z on 2021-06-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 683 joules per kilogram.LCLLFCEL10008507005003002001001 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, Lincoln, IL at 12:00Z on 2021-06-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 263 square meters per square second.193958Sfc1 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
683 J/kg
Mixed-layer CIN
-28 J/kg
Mixed-layer LCL
684 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
263 m²/s²
0-3 km storm-relative helicity
229 m²/s²
Significant tornado parameter
0.5
Supercell composite
3.1

Open this sounding in Storm Lab

The text

As transmitted.

696 
WGUS43 KLSX 261234
FLWLSX

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service St Louis MO
734 AM CDT Sat Jun 26 2021

MOC071-073-113-139-183-219-261815-
/O.NEW.KLSX.FA.W.0007.210626T1234Z-210626T1815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Franklin MO-Gasconade MO-Lincoln MO-Montgomery MO-Saint Charles
MO-Warren MO-
734 AM CDT Sat Jun 26 2021

The National Weather Service in St Louis has issued a

* Flood Warning for...
  Northwestern Franklin County in east central Missouri...
  Northeastern Gasconade County in east central Missouri...
  Lincoln County in east central Missouri...
  Southeastern Montgomery County in east central Missouri...
  West Central Saint Charles County in east central Missouri...
  Warren County in east central Missouri...

* Until 115 PM CDT.

* At 734 AM CDT, the Missouri Department of Transportation reported 
  several roads closed in Warren and Lincoln counties.  Between 3 
  and 5 inches of rain have fallen.

* Some locations that will experience flooding include...
  Wentzville, Troy, Warrenton, Wright City, Hermann, New Haven, 
  Elsberry, Moscow Mills, Davis, Marthasville, Jonesburg, Truesdale, 
  Hawk Point, Innsbrook, Eolia, Fountain N' Lakes, Treloar, Flint 
  Hill, Foristell and Berger.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3875 9142 3914 9119 3923 9118 3922 9072
      3860 9102 3861 9148

$$

Fuchs
1 follow-up statement
619 
WGUS43 KLSX 261800
FLWLSX

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service St Louis MO
100 PM CDT Sat Jun 26 2021

MOC071-073-113-139-183-219-262015-
/O.EXT.KLSX.FA.W.0007.000000T0000Z-210626T2015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Franklin MO-Gasconade MO-Lincoln MO-Montgomery MO-Saint Charles
MO-Warren MO-
100 PM CDT Sat Jun 26 2021

The National Weather Service in St Louis has extended the

* Flood Warning for...
  Northwestern Franklin County in east central Missouri...
  Northeastern Gasconade County in east central Missouri...
  Lincoln County in east central Missouri...
  Southeastern Montgomery County in east central Missouri...
  West Central Saint Charles County in east central Missouri...
  Warren County in east central Missouri...

* Until 315 PM CDT.

* At 100 PM CDT, emergency management reported flooding in the 
  warned area due to thunderstorms. Between 3 and 5 inches of rain 
  have fallen.

* Some locations that will experience flooding include...
  Wentzville, Troy, Warrenton, Wright City, Hermann, New Haven, 
  Elsberry, Moscow Mills, Davis, Marthasville, Jonesburg, Truesdale, 
  Hawk Point, Innsbrook, Eolia, Fountain N' Lakes, Treloar, Flint 
  Hill, Foristell and Berger.

Additional rainfall amounts of 0.5 to 1 inch are possible in the 
warned area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3875 9142 3914 9119 3923 9118 3922 9072
      3860 9102 3861 9148

$$

Fuchs

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 25, 7:15 PM CDTSevere Thunderstorm WarningLSXPike45 min
Jun 25, 7:20 PM CDTSevere Thunderstorm WarningLSXLincoln, Warren40 min
Jun 25, 7:32 PM CDTFlash Flood WarningLSXMarion, Monroe, Pike, Ralls6 hr
Jun 25, 7:50 PM CDTFlash Flood WarningLSXLincoln, Montgomery, Saint Charles, Warren6 hr
Jun 25, 8:00 PM CDTFlash Flood WarningLSXAudrain, Montgomery, Pike, Ralls6 hr
Jun 25, 8:11 PM CDTFlash Flood WarningLSXBoone, Callaway, Cole, Montgomery, Osage, Warren4 hr
Jun 25, 9:29 PM CDTFlash Flood WarningLSXLincoln, Saint Charles6 hr
Jun 25, 9:43 PM CDTFlash Flood Warning Considerable damage threatLSXLincoln, Montgomery, Saint Charles, Warren4 hr
Jun 25, 11:32 PM CDTRiver Flood WarningLSXMarion11 hr
Jun 26, 12:43 AM CDTFlash Flood WarningLSXAudrain, Boone, Callaway, Cole, Gasconade, Moniteau and 5 more6 hr
Jun 26, 12:55 AM CDTRiver Flood WarningLSXCole35 hr
Jun 26, 1:25 AM CDTAreal Flood WarningLSXMarion, Monroe, Pike, Ralls14 hr
Jun 26, 1:48 AM CDTFlash Flood WarningLSXFranklin, Gasconade, Lincoln, Montgomery, Saint Charles, Warren6 hr
Jun 26, 3:29 AM CDTAreal Flood WarningLSXLincoln, Saint Charles9 hr
Jun 26, 6:25 AM CDTAreal Flood WarningLSXAudrain, Boone, Callaway, Cole, Gasconade, Moniteau and 4 more11 hr
Jun 26, 11:42 AM CDTRiver Flood WarningLSXJefferson, Saint Louis8 days
Jun 26, 11:44 AM CDTRiver Flood WarningLSXSaint Charles7 days
Jun 26, 12:13 PM CDTRiver Flood WarningLSXPerry, Sainte Genevieve9 days
Jun 26, 1:37 PM CDTTornado WarningLSXLincoln, Pike38 min
Jun 26, 3:22 PM CDTAreal Flood WarningLSXLincoln2 hr

Nearby

Areal Flood Warnings in Missouri, 2021Every areal 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.