Alert archive / Missouri / Flash Flood Warnings in 2004

Flash Flood Warning 22, NWS St. Louis, MO

July 30, 2004Franklin County, Missouri

NWS St. Louis, MO issued this flash flood warning at Jul 30, 2004, 6:18 AM CDT for Franklin 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
Jul 30, 2004, 6:18 AM CDT (11:18 UTC)
Expired
Jul 30, 2004, 10:15 AM CDT
In force
4 hr
Issued by
NWS St. Louis, MO
Area
Counties, with a storm outline in the text

County Franklin County, MO

The radar

The St Louis radar (KLSX), 39 km from the middle of the area, began a volume at 11:17 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, 11.3 hours before the alert went out and 280 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 00:00Z on 2004-07-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 53 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 00:00Z on 2004-07-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 21 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
53 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
1105 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
21 m²/s²
0-3 km storm-relative helicity
25 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 301125
FFWLSX
MOC071-301515-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
618 AM CDT FRI JUL 30 2004

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

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

* UNTIL 1015 AM CDT

* AT 618 AM CDT...WEATHER SPOTTERS REPORTED FLASH FLOODING IN AND   
AROUND HAPPY SOCK CREEK...APPROXIMATELY 2 MILES NORTH OF SAINT CLAIR.


* FLASH FLOODING CAN BE EXPECTED ACROSS THE AREA...AND WILL BE  
AFFECTING BIRCH CREEK AND BRUSH CREEK AS WELL AS THE AREA AROUND 
SAINT CLAIR. 
 

MOST DEATHS IN FLASH FLOODING OCCUR IN AUTOMOBILES DO NOT ATTEMPT TO
CROSS BRIDGES...DIPS...OR LOW WATER CROSSINGS IF WATER COVERS THE
ROADWAY. DO NOT DRIVE AROUND BARRICADES IF YOUR VEHICLE STALLS...
ABANDON IT IMMEDIATELY AND SEEK HIGHER GROUND.

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

LAT...LON 3855 9074 3821 9079 3822 9138 3871 9138
      3855 9108

$$

WDB
1 follow-up statement
000 
WGUS73 KLSX 301545
FFSLSX
MOC071-099-189-510-301615-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1044 AM CDT FRI JUL 30 2004

...FLASH FLOOD WARNING FOR NORTHERN JEFFERSON...FRANKLIN...
ST. LOUIS CITY AND SOUTHERN ST. LOUIS COUNTIES HAS EXPIRED...

WEATHER SERVICE DOPPLER RADAR INDICATED THAT THE SHOWERS AND 
THUNDERSTORMS WHICH PROMPTED THE FLASH FLOOD WARNING HAVE MOVED OUT 
OF THE AREA.

ALTHOUGH THE HEAVY RAIN HAS SUBSIDED...MOTORISTS SHOULD CONTINUE TO
USE CAUTION WHILE DRIVING THROUGH AREAS THAT HAVE EXPERIENCED
FLOODING. ROADS AND BRIDGES MAY HAVE BEEN DAMAGED BY RAPIDLY FLOWING
FLOOD WATERS.

IN ADDITION...CHILDREN SHOULD NOT BE ALLOWED TO PLAY NEAR
RAIN-SWOLLEN STREAMS OR DRAINAGE DITCHES.

STAY TUNED TO NOAA WEATHER RADIO AND OTHER LOCAL MEDIA FOR FURTHER
DETAILS AND UPDATES.

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 30, 6:52 AM CDTFlash Flood WarningLSXJefferson, Saint Louis, City of Saint Louis4 hr

Nearby

Flash Flood Warnings in Missouri, 2004Every flash flood warning in 2004

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.