Alert archive / Louisiana / Flash Flood Warnings in 2002

Flash Flood Warning 28, NWS New Orleans, LA

October 3, 2002Saint Tammany Parish, Louisiana

NWS New Orleans, LA issued this flash flood warning at Oct 3, 2002, 6:29 AM CDT for Saint Tammany Parish, Louisiana. 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: Oct 3, 2002, 6:29 AM CDT (11:29 UTC)
Expired: Oct 3, 2002, 10:30 AM CDT
In force: 4 hr
Issued by: NWS New Orleans, LA
Area: Whole counties

County Saint Tammany Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 11.5 hours before the alert went out and 30 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: 1165 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 655 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 81 m²/s²
0-3 km storm-relative helicity: 85 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.3

Open this sounding in Storm Lab

The text

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

000 
WGUS54 KLIX 031129
FFWNEW
LAC103-031530-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
628 AM CDT THU OCT 3 2002

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  ST. TAMMANY PARISH IN SOUTHEAST LOUISIANA
  THIS INCLUDES THE CITIES OF...SLIDELL...MANDEVILLE...COVINGTON

* UNTIL 1030 AM CDT

* AT 619 AM CDT...WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY
  RAIN 5 MILES SOUTHEAST OF MANDEVILLE...MOVING NORTHWEST AT 25 MPH.
  LOCALIZED RAINFALL RATES OF 4 TO 6 INCHES PER HOUR WERE OCCURRING.

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS...STREETS AND UNDERPASSES.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROAD.
VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED. MOVE TO HIGHER
GROUND.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNED AREA MOVE TO HIGHER GROUND IMMEDIATELY.

TO REPORT SEVERE WEATHER HAVE THE NEAREST LAW ENFORCEMENT AGENCY
RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE.

1 follow-up statement

000 
WGUS74 KLIX 031357
FFSNEW
LAC103-031530-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
900 AM CDT THU OCT 3 2002

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1030 AM CDT FOR
ST. TAMMANY PARISH...

AT 855 AM...WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A
HEAVY BAND OF RAIN ASSOCIATED WITH HURRICANE LILI MOVING ACROSS ST.
TAMMANY PARISH. THREE HOUR RAINFALL ESTIMATES INDICATE THAT BETWEEN
6 TO 8 INCHES OF RAIN HAVE FALLEN ACROSS VARIOUS LOCATIONS ACROSS
THE PARISH. IN ADDITION...SEVERAL ROADS HAVE BEEN REPORTED AS
IMPASSABLE DUE TO THE TORRENTIAL RAIN. LOW LYING AREAS AND DITCHES
HAVE ALSO BEEN REPORTED AS CLOSE TO BEING FULL WITH FLOODING
PROBLEMS EXPECTED SOON.

MOTORISTS SHOULD NOT DRIVE INTO AREAS WHERE WATER IS COVERING THE
ROADWAY. THE ROAD MAY BE WASHED OUT OR THE DEPTH OF THE WATER WILL BE
UNKNOWN. IT ONLY TAKES A FEW INCHES OF MOVING WATER TO OVERTAKE A
VEHICLE.

STAY TUNED TO NOAA WEATHER RADIO...LOCAL TV OR RADIO FOR THE LATEST
STATEMENTS AND FLOOD WARNINGS.

The office that day

Everything else NWS New Orleans, LA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Oct 2, 9:37 PM CDT	Tornado Warning	LIX	Terrebonne	13 hr
Oct 3, 1:02 AM CDT	Tornado Warning	LIX	Jefferson	28 min
Oct 3, 4:06 AM CDT	Tornado Warning	LIX	Jefferson, Saint Charles	7 hr
Oct 3, 4:29 AM CDT	Tornado Warning	LIX	Jefferson, Orleans, Saint Charles	7 hr
Oct 3, 4:29 AM CDT	Tornado Warning	LIX	Saint Charles	8 hr
Oct 3, 8:20 AM CDT	Tornado Warning	LIX	Saint Tammany, Washington	4 hr
Oct 3, 9:50 AM CDT	Tornado Warning	LIX	Assumption	3 hr
Oct 3, 10:46 AM CDT	Tornado Warning	LIX	Livingston, Tangipahoa	29 min
Oct 3, 10:56 AM CDT	Tornado Warning	LIX	Saint Tammany	34 min
Oct 3, 10:56 AM CDT	Tornado Warning	LIX	Saint Tammany, Washington	6 days
Oct 3, 11:09 AM CDT	Tornado Warning	LIX	East Feliciana	22 days
Oct 3, 11:09 AM CDT	Tornado Warning	LIX	East Feliciana, Saint Helena	22 days

Nearby

Flash Flood Warnings in Louisiana, 2002 Every 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.