Alert archive / Missouri / Flash Flood Warnings in 2003

Flash Flood Warning 30, NWS St. Louis, MO

July 8, 2003Knox County, Lewis County, Missouri

NWS St. Louis, MO issued this flash flood warning at Jul 8, 2003, 5:17 PM CDT for Knox County, Lewis 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: Jul 8, 2003, 5:17 PM CDT (22:17 UTC)
Expired: Jul 8, 2003, 11:15 PM CDT
In force: 6 hr
Issued by: NWS St. Louis, MO
Area: Counties, with a storm outline in the text

Counties Knox County, MO, Lewis County, MO

The radar

The St Louis radar (KLSX), 190 km from the middle of the area, began a volume at 22:19 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

Davenport, (KDVN), launched 12:00Z, 10.3 hours before the alert went out and 199 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: 823 J/kg
Mixed-layer CIN: -80 J/kg
Mixed-layer LCL: 796 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 101 m²/s²
0-3 km storm-relative helicity: 120 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.6

Open this sounding in Storm Lab

The text

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

000 
WGUS53 KLSX 082219
FFWLSX
MOC103-111-090415-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
517 PM CDT TUE JUL 8 2003

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  KNOX COUNTY IN NORTHEAST MISSOURI
  LEWIS COUNTY IN NORTHEAST MISSOURI

* UNTIL 1115 PM CDT

* AT 511 PM CDT...WEATHER SERVICE DOPPLER RADAR INDICATED   
THUNDERSTORMS PRODUCING VERY HEAVY RAIN IN NORTHERN KNOX AND LEWIS 
COUNTIES. ADDITIONAL STORMS ARE DEVELOPING TO THE WEST...AND WILL BE 
MOVING ACROSS THIS SAME AREA LATER THIS EVENING.

* FLASH FLOODING CAN BE EXPECTED ACROSS THE AREA...AND MAY BE   
AFFECTING THE TOWNS OF EDINA...KNOX CITY...LEWISTOWN...AND 
MONTICELLO. RADAR INDICATES THAT AS MUCH AS 3 TO 4 INCHES OF RAIN 
HAS FALLEN SINCE 300 P.M. IN THE MIDDLE AND SOUTH FORKS OF THE 
FABIUS RIVER IN KNOX COUNTY...AND IN THE RAMSEY BRANCH AND SUGAR 
CREEK AREAS OF LEWIS COUNTY. 

IF FLASH FLOODING IS OBSERVED OR IMMINENT...MOVE QUICKLY TO HIGHER
GROUND. NEVER DRIVE INTO AN AREA WHERE WATER COVERS THE ROAD.

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.

LAT...LON 4026 9154 3995 9149 3997 9234 4031 9234

$$

WDB

1 follow-up statement

000 
WGUS73 KLSX 090204
FFSLSX
MOC103-111-090400-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
903 PM CDT TUE JUL 8 2003

...A FLASH FLOOD WARNING REMAINS IN EFFECT FOR LEWIS AND KNOX
COUNTIES UNTIL 1100 PM CDT...

WEATHER SERVICE DOPPLER RADAR INDICATED THAT THE THUNDERSTORMS ARE 
CONTINUING OVER NORTHEAST MISSOURI WITH MODERATE TO HEAVY RAIN 
OCCURING WITH THE STRONGER CELLS. 

AS OF 900 PM SEVERAL COUNTY ROADS AND STATE HIGHWAYS IN KNOX AND 
LEWIS COUNTIES ARE COVERED WITH WATER...WITH STATE HIGHWAY 15 NORTH 
OF EDINA CLOSED...AND SOME COUNTY ROADS CLOSED.  DOPPLER RADAR  
ESTIMATES THAT FOUR TO 6 INCHES OF RAIN HAS FALLEN ACROSS THE WARNED 
AREA...ALL IN ABOUT THREE HOURS TIME.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE 
DANGERS OF FLOODS AND FLASH FLOODS. 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 FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES. AVOID BRIDGES...DIPS...
OR OTHER LOW LYING AREAS...AND NEVER 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. VEHICLES CAUGHT IN RISING WATER
SHOULD BE ABANDONED QUICKLY. MOVE TO HIGHER GROUND.

$$

WDB

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 8, 3:57 PM CDT	Severe Thunderstorm Warning	LSX	Knox, Lewis	63 min

Nearby

Flash Flood Warnings in Missouri, 2003 Every flash flood warning in 2003

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.