Alert archive / Louisiana / Flash Flood Warnings in 2002

Flash Flood Warning 27, NWS New Orleans, LA

September 26, 2002Livingston Parish, Saint John the Baptist Parish, Tangipahoa Parish, Louisiana

NWS New Orleans, LA issued this flash flood warning at Sep 26, 2002, 11:51 PM CDT for Livingston Parish, Saint John the Baptist Parish, Tangipahoa Parish, Louisiana. It was in force for 8 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: Sep 26, 2002, 11:51 PM CDT (04:51 UTC)
Expired: Sep 27, 2002, 8:00 AM CDT
In force: 8 hr
Issued by: NWS New Orleans, LA
Area: Whole counties

Counties Livingston Parish, LA, Saint John the Baptist Parish, LA, Tangipahoa Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 4.9 hours before the alert went out and 82 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: 22 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 640 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: -1 m²/s²
0-3 km storm-relative helicity: 21 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 
WGUS54 KLIX 270451
FFWNEW
LAC063-095-105-271300-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1150 PM CDT THU SEP 26 2002

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  LIVINGSTON PARISH IN SOUTHEAST LOUISIANA
  ST. JOHN THE BAPTIST PARISH IN SOUTHEAST LOUISIANA
  THIS INCLUDES THE CITIES OF...RESERVE...LAPLACE
  TANGIPAHOA PARISH IN SOUTHEAST LOUISIANA

* THE FLASH FLOOD WARNING FOR ST TAMMANY PARISH HAS BEEN CANCELLED. 
FLOOD WATERS HAVE RECEDED ALLOWING ROADS TO BECOME PASSABLE.

* UNTIL 800 AM CDT

* TIDES LEVELS IN LAKE MAUREPAS REMAIN AT 3 TO 4 FEET ABOVE NORMAL 
DUE TO DRAINIAGE FROM THE AMITE AND TICKFAW RIVERS. FLOOD WATERS 
FLOWING INTO LAKE PONTCHARTRAIN ARE CAUSING WATER LEVELS FROM 
DROPPING IN LAKE MAUREPAS. TIDAL FLOODING OF LOW LYING ROADS AND 
HOMES ADJACENT TO THE LAKES WILL CONTINUE INTO THE MORNING HOURS. 
WATERS ARE EXPECTED TO SLOWLY RECEDE AROUND 8 AM AND CONTINUE INTO 
THE AFTERNOON AT ONE HALF FOOT PER HOUR. 

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.

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

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS New Orleans, LA wrote its last area forecast discussion before this flash flood warning went out at Sep 26, 3:15 PM CDT, 8 hours 36 minutes earlier.

Area forecast discussion, Sep 26, 3:15 PM CDT, 8 hours 36 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NEW ORLEANS/BATON ROUGE LA
315 PM CDT THU SEP 26 2002

THE EFFECTS OF ISIDORE CONTINUE TO DIMINISH ACROSS THE FORECAST AREA
THIS AFTERNOON WITH THE CENTER OF THE SYSTEM NOW LOCATED OVER
CENTRAL MISSISSIPPI AND CONTINUING TO MOVE OFF TO THE NORTH AT A
FAIRLY GOOD PACE. SATELLITE IMAGERY SHOWS A LARGE AREA OF CLOUDINESS
ASSOCIATED WITH ISIDORE DRAPED ACROSS ALL OF THE CENTRAL GULF COAST
REGION AND MOST OF THE NORTH GULF. THIS CLOUDINESS SHOULD PERSIST
THROUGH THE EVENING HOURS WITH PARTIAL CLEARING TAKING PLACE
OVERNIGHT AS ISIDORE GETS CAUGHT UP IN THE WESTERLIES AND EXITS THE
REGION. DRIER AIR ON THE BACKSIDE OF THE SYSTEM WILL ADVECT INTO THE
AREA FRIDAY AND OVER THE WEEKEND ALLOWING FOR PLENTY SUNSHINE AND A
CHANCE TO DRY OUT. MOISTURE WILL BEGIN TO INCREASE AGAIN EARLY NEXT
WEEK AS DEEP SOUTHEASTERLY FLOW DEVELOPS OVER THE AREA WITH AN
INCREASE IN CLOUDINESS AND A CHANCE OF SHOWERS. MODELS FORECAST THE
REMNANTS OF LILI OR A REGENERATED LILI ENTERING THE SOUTH GULF EARLY
NEXT WEEK.

PRELIMINARY NUMBERS FOLLOW...

MCB 67/86/65/87 2000   BTR 68/87/67/88 0000
MSY 71/86/70/88 0000   GPT 70/85/69/87 0000

.NEW...SMALL CRAFT ADVISORY PQL TO ATCHAFALAYA RIVER OUT 60 NM
       INCLUDING LAKES PONTCHARTRAIN AND MAUREPAS
LA...NONE.
MS...NONE.

11

In the hours before

Special weather statement, Sep 26, 6:00 PM CDT, 5 hours 51 minutes before

LAZ034>040-046>050-056>070-MSZ068>071-077-080>082-271200-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NEW ORLEANS LA
600 PM CDT THU SEP 26 2002

.SYNOPSIS...TROPICAL STORM ISIDORE IS MOVING INTO NORTHERN
MISSISSIPPI. WINDS WILL DIMINISH TONIGHT TO 10 TO 15 KNOTS. NO
PRECIPITATION IS EXPECTED ACROSS THE AREA TONIGHT. WATER FROM THE
STORM SURGE WHICH MOVED INTO LAKE PONTCHARTRAIN HAS BEGUN TO FLOW
BACK INTO THE GULF OF MEXICO.

RIVER FLOODING...
REFER TO LATEST ADVISORIES FOR RIVER FLOODING ACROSS SOUTHEAST
LOUISIANA AND SOUTHERN MISSISSIPPI.

.ACTIONS...NONE AT THIS TIME.

FOR MORE INFORMATION...VISIT OUR WEB SITE AT WWW.SRH.NOAA.GOV.LIX
(ALL LOWER CAST).

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.