Alert archive / Missouri / Flash Flood Warnings in 2005

Flash Flood Warning 7, NWS St. Louis, MO

April 21, 2005Washington County, Missouri

NWS St. Louis, MO issued this flash flood warning at Apr 21, 2005, 11:45 PM CDT for Washington County, Missouri. It was in force for 6 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, 11:45 PM CDT (04:45 UTC)
Expired: Apr 22, 2005, 5:45 AM CDT
In force: 6 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), 78 km from the middle of the area, began a volume at 04:47 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 00:00Z, 4.8 hours before the alert went out and 285 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1218 J/kg
Mixed-layer CIN: -48 J/kg
Mixed-layer LCL: 1229 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 81 m²/s²
0-3 km storm-relative helicity: 150 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 3.4

Open this sounding in Storm Lab

The text

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

000 
WGUS53 KLSX 220446
FFWLSX
MOC221-221045-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1145 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 545 AM CDT

* AT 1137 PM CDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED FLOODING 
  STILL OCCURRING IN THE POTOSI AREA.

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

EVEN THOUGH FLOOD WATERS FROM EARLIER THIS EVENING HAVE BEEN 
RECEDING...AN AREA OF THUNDERSTORMS PRODUCING HEAVY RAINFALL WILL BE 
MOVING THROUGH THE AREA AFTER MIDNIGHT.  ADDITIONAL AMOUNTS OF AN 
INCH OR MORE ARE POSSIBLE IN WASHINGTON COUNTY. THIS WILL ADD TO THE 
FLOODING PROBLEMS FROM EARLIER THIS EVENING.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW
LYING AREAS ARE SUBJECT TO FLOODING.

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.

MOST FLOOD RELATED DEATHS OCCUR IN AUTOMOBILES. DO NOT ATTEMPT TO 
CROSS WATER COVERED BRIDGES...DIPS...OR LOW WATER CROSSINGS. NEVER 
TRY TO CROSS A FLOWING STREAM...EVEN A SMALL ONE...ON FOOT. TO 
ESCAPE RISING WATER MOVE UP TO HIGHER GROUND.

LAT...LON 3791 9111 3781 9065 3807 9066 3821 9078
      3823 9111

$$

CARNEY

1 follow-up statement

000 
WGUS73 KLSX 220900
FFSLSX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
356 AM CDT FRI APR 22 2005

MOC221-220906-
WASHINGTON MO-
356 AM CDT FRI APR 22 2005

...THE FLASH FLOOD WARNING FOR WASHINGTON COUNTY IS CANCELLED...

RAIN ENDED SEVERAL HOURS AGO AND REPORTS FROM LOCAL LAW ENFORCEMENT 
INDICATE THAT THE FLOOD WATERS WHICH PROMPTED THE EARLIER WARNINGS 
HAS RECEDED.  SOME PONDING STILL EXISTED ON A FEW AREA ROADWAYS AND 
THIS WILL CONTINUE TO RECEDE AS WELL.  


LAT...LON 3791 9111 3781 9065 3807 9066 3821 9078
      3823 9111

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 21, 7:17 PM CDT	Severe Thunderstorm Warning	LSX	Crawford, Gasconade	43 min
Apr 21, 7:27 PM CDT	Severe Thunderstorm Warning	LSX	Boone	53 min
Apr 21, 7:36 PM CDT	Severe Thunderstorm Warning	LSX	Saint Charles	39 min
Apr 21, 7:45 PM CDT	Severe Thunderstorm Warning	LSX	Osage	45 min
Apr 21, 8:08 PM CDT	Severe Thunderstorm Warning	LSX	Washington	52 min
Apr 21, 8:15 PM CDT	Severe Thunderstorm Warning	LSX	Cole	32 min
Apr 21, 8:25 PM CDT	Severe Thunderstorm Warning	LSX	Saint Francois	52 min
Apr 21, 8:30 PM CDT	Severe Thunderstorm Warning	LSX	Osage	45 min
Apr 21, 8:49 PM CDT	Severe Thunderstorm Warning	LSX	Gasconade	41 min
Apr 21, 8:59 PM CDT	Severe Thunderstorm Warning	LSX	Washington	31 min
Apr 21, 9:02 PM CDT	Severe Thunderstorm Warning	LSX	Boone, Callaway	58 min
Apr 21, 9:55 PM CDT	Severe Thunderstorm Warning	LSX	Boone, Callaway	65 min
Apr 21, 10:05 PM CDT	Severe Thunderstorm Warning	LSX	Cole, Moniteau	55 min
Apr 21, 10:35 PM CDT	Severe Thunderstorm Warning	LSX	Montgomery	40 min
Apr 21, 11:09 PM CDT	Severe Thunderstorm Warning	LSX	Warren	36 min
Apr 21, 11:32 PM CDT	Severe Thunderstorm Warning	LSX	Osage	43 min
Apr 21, 11:37 PM CDT	Severe Thunderstorm Warning	LSX	Franklin	41 min
Apr 21, 11:45 PM CDT	Severe Thunderstorm Warning	LSX	Saint Charles, Warren	47 min

Nearby

Flash Flood Warnings in Missouri, 2005 Every 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.