Alert archive / Missouri / Flash Flood Warnings in 2005

Flash Flood Warning 6, NWS St. Louis, MO

April 21, 2005Washington County, Missouri

NWS St. Louis, MO issued this flash flood warning at Apr 21, 2005, 6:39 PM CDT for Washington County, Missouri. It was in force for 5 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
Apr 21, 2005, 6:39 PM CDT (23:39 UTC)
Expired
Apr 21, 2005, 11:45 PM CDT
In force
5 hr
Issued by
NWS St. Louis, MO
Area
Counties, with a storm outline in the text

County Washington County, MO

The radar

The St Louis radar (KLSX), 73 km from the middle of the area, began a volume at 23:43 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 nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 11.7 hours before the alert went out and 287 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, Springfield, MO at 12:00Z on 2005-04-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 780 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, Springfield, MO at 12:00Z on 2005-04-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 118 square meters per square second.1939Sfc1 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
780 J/kg
Mixed-layer CIN
-135 J/kg
Mixed-layer LCL
696 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
118 m²/s²
0-3 km storm-relative helicity
93 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WGUS53 KLSX 212342
FFWLSX
MOC221-220445-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
639 PM CDT THU APR 21 2005

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WASHINGTON COUNTY IN EAST CENTRAL MISSOURI

* UNTIL 1145 PM CDT

* AT 638 PM CDT...TRAINED WEATHER SPOTTERS REPORTED FLASH FLOODING
  FROM THUNDERSTORMS NORTH OF POTOSI ON HIGHWAY F. ALSO...RADAR
  INDICATED OVER 2 INCHES OF RAIN HAS FALLEN IN THE PAST HOUR IN
  THIS AREA.

* FLASH FLOODING CAN BE EXPECTED ACROSS THE AREA...AND WILL BE
  AFFECTING...POTOSI...RICHWOODS AND OLD MINES.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE
BANKS OF CREEKS AND STREAMS.

LAT...LON 3818 9110 3783 9105 3792 9066 3806 9066
      3820 9079

$$
BYRD
2 follow-up statements
000 
WGUS73 KLSX 220117
FFSLSX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
813 PM CDT THU APR 21 2005

MOC221-220445-
WASHINGTON MO-
813 PM CDT THU APR 21 2005

...A FLASH FLOOD WARNING CONTINUES UNTIL 1145 PM CDT FOR WASHINGTON
COUNTY...

AT 805 PM CDT...WASHINGTON COUNTY SHERIFF/S DEPARTMENT REPORTED THAT 
NUMEROUS ROADS WERE FLOODED IN AND AROUND POTOSI.  BRITTON CREEK 
WHICH FLOWS THROUGH DOWNTOWN POTOSI IS OUT OF ITS BANKS.  ALSO... 
HIGHWAY F IN GLENDALE AND JORDAN ROAD OFF HIGHWAY 8 WERE FLOODED.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO POTOSI 
...LATTY...MINERAL POINT...OLD MINES AND SHIRLEY.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE
BANKS OF CREEKS AND STREAMS.

LAT...LON 3817 9107 3784 9101 3783 9066 3806 9066
      3818 9078

$$
BYRD
000 
WGUS73 KLSX 220336
FFSLSX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1031 PM CDT THU APR 21 2005

MOC221-220445-
WASHINGTON MO-
1031 PM CDT THU APR 21 2005

...A FLASH FLOOD WARNING CONTINUES UNTIL 1145 PM CDT FOR WASHINGTON
COUNTY...

AT 1027 PM CDT...WATER CONTINUES TO BE REPORTED ACROSS NUMEROUS 
ROADWAYS IN AND AROUND POTISI.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO 
POTOSI...RICHWOODS...AND OLD MINES.

ANOTHER AREA OF THUNDERSTORMS WILL MOVE OUT OF CENTRAL MISSOURI AND 
WILL AFFECT WASHINGTON COUNTY AROUND MIDNIGHT TONIGHT.  ADDITIONAL 
RAINFALL OF AN INCH OR MORE WILL BE POSSIBLE WITH THESE STORMS.

EVEN THOUGH CREEKS AND STREAMS WILL BE RECEDING BEFORE THESE STORMS 
MOVE INTO WASHINGTON COUNTY...EXPECT A RAPID RISE AGAIN ONCE THE 
RAIN STARTS DUE TO THE SATURATED GROUND.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

LAT...LON 3818 9110 3783 9105 3792 9066 3806 9066
      3820 9079

$$

CARNEY

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 20, 9:08 PM CDTSevere Thunderstorm WarningLSXWashington54 min
Apr 20, 10:54 PM CDTSevere Thunderstorm WarningLSXCrawford, Franklin51 min
Apr 20, 11:41 PM CDTSevere Thunderstorm WarningLSXCrawford49 min
Apr 21, 3:04 AM CDTSevere Thunderstorm WarningLSXJefferson, Saint Louis42 min
Apr 21, 4:25 AM CDTFlash Flood WarningLSXCrawford5 hr
Apr 21, 5:53 AM CDTFlash Flood WarningLSXJefferson4 hr
Apr 21, 3:33 PM CDTSevere Thunderstorm WarningLSXCole, Moniteau42 min
Apr 21, 3:51 PM CDTTornado WarningLSXMoniteau41 min
Apr 21, 4:13 PM CDTTornado WarningLSXBoone32 min
Apr 21, 4:40 PM CDTTornado WarningLSXCallaway50 min
Apr 21, 4:44 PM CDTSevere Thunderstorm WarningLSXBoone17 min
Apr 21, 4:48 PM CDTSevere Thunderstorm WarningLSXGasconade42 min
Apr 21, 4:53 PM CDTSevere Thunderstorm WarningLSXIron55 min
Apr 21, 4:59 PM CDTTornado WarningLSXOsage46 min
Apr 21, 5:15 PM CDTSevere Thunderstorm WarningLSXFranklin45 min
Apr 21, 5:17 PM CDTSevere Thunderstorm WarningLSXCrawford58 min
Apr 21, 5:30 PM CDTSevere Thunderstorm WarningLSXGasconade30 min
Apr 21, 5:41 PM CDTTornado WarningLSXOsage49 min
Apr 21, 5:55 PM CDTSevere Thunderstorm WarningLSXWashington50 min
Apr 21, 5:59 PM CDTSevere Thunderstorm WarningLSXFranklin50 min
Apr 21, 6:18 PM CDTSevere Thunderstorm WarningLSXJefferson42 min
Apr 21, 6:41 PM CDTSevere Thunderstorm WarningLSXWashington50 min
Apr 21, 6:55 PM CDTSevere Thunderstorm WarningLSXJefferson, Saint Louis, City of Saint Louis54 min

Nearby

Flash Flood Warnings in Missouri, 2005Every flash flood warning in 2005

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.