Alert archive / Missouri / Flash Flood Warnings in 2000

Flash Flood Warning 3, NWS St. Louis, MO

May 7, 2000Jefferson County, Missouri

NWS St. Louis, MO issued this flash flood warning at May 7, 2000, 4:49 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 counties it named.

The facts

Issued
May 7, 2000, 4:49 AM CDT (09:49 UTC)
Expired
May 7, 2000, 9:00 AM CDT
In force
4 hr
Issued by
NWS St. Louis, MO
Area
Whole counties

County Jefferson County, MO

The radar

The St Louis radar (KLSX), 50 km from the middle of the area, began a volume at 10:08 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, 9.8 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-pSkew-T log-p diagram, Lincoln, IL at 00:00Z on 2000-05-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 178 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, Lincoln, IL at 00:00Z on 2000-05-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 15 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
178 J/kg
Mixed-layer CIN
-54 J/kg
Mixed-layer LCL
1032 m above ground
0-6 km bulk shear
7 kt
0-1 km storm-relative helicity
15 m²/s²
0-3 km storm-relative helicity
47 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 070948
FFWLSX
MOC099-071400-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
449 AM CDT SUN MAY 7 2000

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

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

* UNTIL 900 AM CDT

* AT 430 AM NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  COMPLEX OF THUNDERSTORMS WHICH HAS DUMPED COPIOUS RAINFALL ONTO
  FRANKLIN COUNTY HAS EDGED FURTHER SOUTHEAST INTO JEFFERSON COUNTY.
  THESE STORMS ARE SHOWING LITTLE MOVEMENT...SAGGING SLOWLY
  SOUTHEAST. HEAVIEST RAINS WILL FALL FROM HOUSE SPRINGS TO DITTMER
  BUT WILL CONTINUE TO OVERSPREAD THE REST OF THE COUNTY BETWEEN NOW
  AND 6AM.

* LOW WATER BRIDGES AND SECONDARY ROADS WILL FLOOD FIRST...CREEKS
  WILL RISE VERY RAPIDLY. COMMUNITIES AND RURAL AREAS ALONG THE BIG
  RIVER IN JEFFERSON COUNTY WILL BE VULNERABLE TO FLASH FLOODING.

 THIS STORM COMPLEX IS CAPABLE OF PRODUCING SEVERAL INCHES OF RAIN
 BEFORE MORNING. SOME AREAS OF FRANKLIN COUNTY HAVE RECEIVED 3 TO
 10 INCHES OF RAIN AND IT IS STILL RAINING. THIS IS AN EXTREMELY
 DANGEROUS SITUATION.

 IF YOU ARE IN A LOW AREA OR HAVE FRIENDS OR FAMILY THAT DO...CALL
 THEM AND WAKE THEM UP TO MAKE SURE THEY ARE AWARE OF THE DANGER
 AND CAN TAKE ACTION FOR SAFETY.

  IF FLASH FLOODING IS OBSERVED OR IMMINENT...MOVE QUICKLY TO HIGHER
  GROUND. NEVER DRIVE INTO AN AREA WHERE WATER COXVERS THE ROAD...
  ESPECIALLY LOW-WATER BRIDGES

  PEDIGO/BRITT

The office that day

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

IssuedProductOfficeCountiesLasted
May 7, 12:53 AM CDTFlash Flood WarningLSXFranklin, Gasconade5 hr
May 7, 2:05 AM CDTSevere Thunderstorm WarningLSXFranklin55 min
May 7, 2:23 AM CDTFlash Flood WarningLSXSaint Charles, Saint Louis5 hr
May 7, 4:22 AM CDTSevere Thunderstorm WarningLSXFranklin, Washington38 min
May 7, 6:32 AM CDTFlash Flood WarningLSXFranklin, Saint Charles, Saint Louis2 hr

Nearby

Flash Flood Warnings in Missouri, 2000Every flash flood warning in 2000

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.