Alert archive / Missouri / Flash Flood Warnings in 2003

Flash Flood Warning 29, NWS St. Louis, MO

June 30, 2003Audrain County, Boone County, Missouri

NWS St. Louis, MO issued this flash flood warning at Jun 30, 2003, 8:03 PM CDT for Audrain County, Boone 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 counties it named.

The facts

Issued: Jun 30, 2003, 8:03 PM CDT (01:03 UTC)
Expired: Jul 1, 2003, 12:00 AM CDT
In force: 4 hr
Issued by: NWS St. Louis, MO
Area: Whole counties

Counties Audrain County, MO, Boone County, MO

The radar

The St Louis radar (KLSX), 129 km from the middle of the area, began a volume at 01:02 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, 1.1 hours before the alert went out and 288 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: 21 J/kg
Mixed-layer CIN: -128 J/kg
Mixed-layer LCL: 1445 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: -50 m²/s²
0-3 km storm-relative helicity: -29 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 010107
FFWLSX
MOC007-019-010500-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
803 PM CDT MON JUN 30 2003

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WESTERN AUDRAIN COUNTY IN CENTRAL MISSOURI
  NORTHERN BOONE COUNTY IN CENTRAL MISSOURI

* UNTIL MIDNIGHT CDT

* AT 803 PM CDT...WEATHER SERVICE DOPPLER RADAR INDICATED     
  THUNDERSTORMS PRODUCING VERY HEAVY RAIN IN AND AROUND THE
  CENTRALIA...STURGEON AREAS OF NORTHERN BOONE COUNTY AND 
  RURAL SECTIONS OF WESTERN AUDRAIN COUNTY COVERING ROUTE 151
  AND COUNTY HIGHWAYS C...CC AND EE. 

* RADAR HAS INDICATED THAT AS MUCH AS TWO TO THREE INCHES OF RAIN
  WITH LOCALLY HIGHER AMOUNTS HAS FALLEN IN JUST THE PAST TWO 
  HOURS.  THUNDERSTORMS WITH VERY HEAVY RAIN WILL CONTINUE ACROSS 
  WESTERN AUDRAIN COUNTY FOR THE NEXT HOUR ADDING ANOTHER INCH OR TWO
  TO THE RAIN TOTALS.

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

$$

TES/WDB

1 follow-up statement

000 
WGUS73 KLSX 010420
FFSLSX
MOC007-019-010500-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1117 PM CDT MON JUN 30 2003

...FLASH FLOOD WARNING FOR WESTERN AUDRAIN AND NORTHERN BOONE 
COUNTIES HAS BEEN CANCELLED...

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

AS OF 1110 PM...NO REPORTS OF FLOODING HAD BEEN RECEIVED AT THE 
NATIONAL WEATHER SERVICE.  DOPPLER RADAR HAD ESTIMATED TWO TO FOUR 
INCHES OF RAIN HAD FALLEN ACROSS THE WARNED AREA...ALL IN ABOUT TWO 
HOURS TIME.

$$

TES/WDB

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.