Alert archive / Missouri / Flash Flood Warnings in 2005

Flash Flood Warning 5, NWS St. Louis, MO

April 21, 2005Jefferson County, Missouri

NWS St. Louis, MO issued this flash flood warning at Apr 21, 2005, 5:53 AM CDT for Jefferson County, Missouri. It was in force for 4 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, 5:53 AM CDT (10:53 UTC)
Expired: Apr 21, 2005, 10:00 AM CDT
In force: 4 hr
Issued by: NWS St. Louis, MO
Area: Counties, with a storm outline in the text

County Jefferson County, MO

The radar

The St Louis radar (KLSX), 53 km from the middle of the area, began a volume at 10:56 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 00:00Z, 10.9 hours before the alert went out and 268 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: 448 J/kg
Mixed-layer CIN: -43 J/kg
Mixed-layer LCL: 1232 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 126 m²/s²
0-3 km storm-relative helicity: 194 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.3

Open this sounding in Storm Lab

The text

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

000 
WGUS53 KLSX 211056
FFWLSX
MOC099-211500-

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

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

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

* UNTIL 1000 AM CDT

* AT 551 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  THAT TWO TO THREE INCHES OF RAINFALL HAS FALLEN OVER JUST A 3 HOUR 
  PERIOD FROM THUNDERSTORMS MOVING OVER THE WARNED AREA AGAIN AND 
  AGAIN.

* FLASH FLOODING CAN BE EXPECTED ACROSS THE AREA...AND WILL BE   
  AFFECTING CEDAR HILL...MORSE MILL...HILLSBORO...VICTORIA AND 
  DE SOTO.

ADDITIONAL RAINFALL AMOUNTS OF UP TO ONE INCH ARE POSSIBLE IN THE 
WARNED AREA.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.

IN HILLY TERRAIN THERE ARE HUNDREDS OF LOW WATER CROSSINGS WHICH ARE
POTENTIALLY DANGEROUS IN HEAVY RAIN. DO NOT ATTEMPT TO TRAVEL ACROSS
FLOODED ROADS. FIND ALTERNATE ROUTES. IT ONLY TAKES A FEW INCHES OF
SWIFTLY FLOWING WATER TO CARRY VEHICLES AWAY.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.

TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY
YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN ST
LOUIS.

LAT...LON 3801 9061 3807 9060 3819 9077 3846 9073
      3844 9066 3849 9058 3849 9041 3844 9039
      3845 9035 3823 9037 3812 9026 3809 9030
      3810 9034 3804 9043

$$

TES

2 follow-up statements

000 
WGUS73 KLSX 211212
FFSLSX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
710 AM CDT THU APR 21 2005

MOC099-211500-
JEFFERSON MO-
710 AM CDT THU APR 21 2005

...A FLASH FLOOD WARNING CONTINUES UNTIL 1000 AM CDT FOR JEFFERSON
COUNTY...

SERIOUS FLOODING IS BEING REPORTED IN PARTS OF JEFFERSON COUNTY THIS 
MORNING.  SHORTLY BEFORE 7 AM...THE JEFFERSON COUNTY SHERIFFS OFFICE 
REPORTED THAT HIGHWAY 21 WAS BEING CLOSED NEAR HILLSBORO DUE TO 2 TO 
3 FEET OF WATER COVERING THE ROAD.

NUMEROUS STREETS WERE ALSO FLOODED IN BOTH THE HILLSBORO AND DE 
SOTO AREAS.  

AT 705 AM...WEATHER SERVICE RADAR INDICATED THAT THE THUNDERSTORMS 
PRODUCING THE HEAVIEST RAINS HAD NOW PUSHED INTO SOUTHERN JEFFERSON 
COUNTY...SOUTH OF DE SOTO.  IF THE THUNDERSTORMS CONTINUE TO MOVE 
SOUTH...THE HEAVIEST RAINS WILL EXIT THE COUNTY BETWEEN 730 AND 8 
AM.  HOWEVER...RUNOFF WILL CONTINUE TO POSE A SERIOUS FLASH FLOOD 
THREAT FOR SEVERAL HOURS AFTER THE END OF THE RAIN.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE 
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS 
SAFELY.  IF YOU COME ACROSS A FLOODED ROAD...TURN AROUND AND FIND A 
SAFE ROUTE TO YOUR DESTINATION. DO NOT BECOME A STATISTIC...NO TRIP 
IS WORTH YOUR LIFE  

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING. 
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY. 
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE 
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. 

LAT...LON 3801 9061 3807 9060 3819 9077 3846 9073
      3844 9066 3849 9058 3849 9041 3844 9039
      3845 9035 3823 9037 3812 9026 3809 9030
      3810 9034 3804 9043

$$

TRUETT

000 
WGUS73 KLSX 211505
FFSLSX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1003 AM CDT THU APR 21 2005

MOC099-211513-
JEFFERSON MO-
1003 AM CDT THU APR 21 2005

...THE FLASH FLOOD WARNING FOR JEFFERSON COUNTY HAS EXPIRED...

THE RAIN AND FLOODING HAS SUBSIDED OVER JEFFERSON COUNTY THIS 
MORNING...SO THE FLASH FLOOD WARNING HAS BEEN ALLOWED TO EXPIRE.

HOWEVER...ADDITIONAL THUNDERSTORMS ARE POSSIBLE THIS AFTERNOON WITH 
THE POTENTIAL FOR SEVERE WEATHER AND ADDITIONAL FLOODING. SO BE ON 
THE ALERT TO THE CHANGING WEATHER CONDITIONS THIS AFTERNOON AND 
EVENING.


LAT...LON 3801 9061 3807 9060 3819 9077 3846 9073
      3844 9066 3849 9058 3849 9041 3844 9039
      3845 9035 3823 9037 3812 9026 3809 9030
      3810 9034 3804 9043

$$
BYRD

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 20, 9:08 PM CDT	Severe Thunderstorm Warning	LSX	Washington	54 min
Apr 20, 10:54 PM CDT	Severe Thunderstorm Warning	LSX	Crawford, Franklin	51 min
Apr 20, 11:41 PM CDT	Severe Thunderstorm Warning	LSX	Crawford	49 min
Apr 21, 3:04 AM CDT	Severe Thunderstorm Warning	LSX	Jefferson, Saint Louis	42 min
Apr 21, 4:25 AM CDT	Flash Flood Warning	LSX	Crawford	5 hr
Apr 21, 3:33 PM CDT	Severe Thunderstorm Warning	LSX	Cole, Moniteau	42 min
Apr 21, 3:51 PM CDT	Tornado Warning	LSX	Moniteau	41 min
Apr 21, 4:13 PM CDT	Tornado Warning	LSX	Boone	32 min
Apr 21, 4:40 PM CDT	Tornado Warning	LSX	Callaway	50 min
Apr 21, 4:44 PM CDT	Severe Thunderstorm Warning	LSX	Boone	17 min
Apr 21, 4:48 PM CDT	Severe Thunderstorm Warning	LSX	Gasconade	42 min
Apr 21, 4:53 PM CDT	Severe Thunderstorm Warning	LSX	Iron	55 min
Apr 21, 4:59 PM CDT	Tornado Warning	LSX	Osage	46 min
Apr 21, 5:15 PM CDT	Severe Thunderstorm Warning	LSX	Franklin	45 min
Apr 21, 5:17 PM CDT	Severe Thunderstorm Warning	LSX	Crawford	58 min
Apr 21, 5:30 PM CDT	Severe Thunderstorm Warning	LSX	Gasconade	30 min
Apr 21, 5:41 PM CDT	Tornado Warning	LSX	Osage	49 min
Apr 21, 5:55 PM CDT	Severe Thunderstorm Warning	LSX	Washington	50 min
Apr 21, 5:59 PM CDT	Severe Thunderstorm Warning	LSX	Franklin	50 min
Apr 21, 6:18 PM CDT	Severe Thunderstorm Warning	LSX	Jefferson	42 min
Apr 21, 6:39 PM CDT	Flash Flood Warning	LSX	Washington	5 hr
Apr 21, 6:41 PM CDT	Severe Thunderstorm Warning	LSX	Washington	50 min
Apr 21, 6:55 PM CDT	Severe Thunderstorm Warning	LSX	Jefferson, Saint Louis, City of Saint Louis	54 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.