Alert archive / Missouri / Flash Flood Warnings in 2002

Flash Flood Warning 31, NWS St. Louis, MO

August 20, 20024 counties in Missouri

NWS St. Louis, MO issued this flash flood warning at Aug 20, 2002, 1:32 AM CDT for 4 counties in 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 counties it named.

The facts

Issued
Aug 20, 2002, 1:32 AM CDT (06:32 UTC)
Expired
Aug 20, 2002, 7:30 AM CDT
In force
6 hr
Issued by
NWS St. Louis, MO
Area
Whole counties

Counties Boone County, MO, Callaway County, MO, Cole County, MO, Osage County, MO

The radar

The St Louis radar (KLSX), 123 km from the middle of the area, began a volume at 06:34 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, 6.5 hours before the alert went out and 250 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, Springfield, MO at 00:00Z on 2002-08-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3042 joules per kilogram.LCLLFCEL10008507005003002001001 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, Springfield, MO at 00:00Z on 2002-08-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -3 square meters per square second.1939Sfc1 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
3042 J/kg
Mixed-layer CIN
-5 J/kg
Mixed-layer LCL
1610 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
-3 m²/s²
0-3 km storm-relative helicity
16 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 200632
FFWSTL
MOC019-027-051-151-201230-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
128 AM CDT TUE AUG 20 2002

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  BOONE COUNTY IN CENTRAL MISSOURI
  CALLAWAY COUNTY IN CENTRAL MISSOURI
  COLE COUNTY IN CENTRAL MISSOURI
  OSAGE COUNTY IN CENTRAL MISSOURI

* UNTIL 730 AM CDT

* AT 128 AM CDT...WEATHER SERVICE DOPPLER RADAR INDICATED   
THUNDERSTORMS PRODUCING VERY HEAVY RAIN EXTENDING FROM NEAR 
HARRISBURG IN NORTHWEST BOONE COUNTY TO NEAR LINN IN OSAGE COUNTY.  
THESE STORMS WERE REPEATEDLY MOVING OVER THE SAME LOCATIONS AS THEY 
MOVED TO THE SOUTHEAST AT 25 MPH.  RADAR ESTIMATES THAT 2.5 TO 4 
INCHES OF RAIN HAS ALREADY FALLEN SINCE 1100 PM IN THE REGION FROM 
HARRISBURG TO COLUMBIA TO NEW BLOOMFIELD.  ANOTHER 1 TO 3 INCHES OF 
RAIN IS POSSIBLE THROUGH 400 AM.

* FLASH FLOODING CAN BE EXPECTED ACROSS THE AREA...INCLUDING THE 
LARGER COMMUNITIES OF COLUMBIA AND JEFFERSON CITY.

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

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.

GLASS

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 19, 9:02 PM CDTSevere Thunderstorm WarningLSX43 min
Aug 19, 9:23 PM CDTFlash Flood WarningLSXIron, Reynolds3 hr
Aug 19, 9:30 PM CDTTornado WarningLSXReynolds30 min
Aug 19, 10:24 PM CDTSevere Thunderstorm WarningLSX51 min
Aug 20, 12:02 AM CDTSevere Thunderstorm WarningLSX43 min

Nearby

Flash Flood Warnings in Missouri, 2002Every flash flood warning in 2002

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.