Alert archive / Louisiana / Flash Flood Warnings in 1998

Flash Flood Warning 2, NWS New Orleans, LA

January 6, 1998Assumption Parish, Saint James Parish, Louisiana

NWS New Orleans, LA issued this flash flood warning at Jan 6, 1998, 8:32 PM CST for Assumption Parish, Saint James 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: Jan 6, 1998, 8:32 PM CST (02:32 UTC)
Expired: Jan 7, 1998, 12:30 AM CST
In force: 4 hr
Issued by: NWS New Orleans, LA
Area: Whole counties

Counties Assumption Parish, LA, Saint James Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 2.5 hours before the alert went out and 122 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: 4 J/kg
Mixed-layer CIN: -252 J/kg
Mixed-layer LCL: 768 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 319 m²/s²
0-3 km storm-relative helicity: 407 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KNEW 070233
FFWNEW
LAC005-007-033-047-063-093-121-070615-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
832 PM CST TUE JAN 6 1998

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS LA HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL 1230 AM CST
FOR PEOPLE IN THE FOLLOWING LOCATIONS...

IN SOUTHEASTERN LOUISIANA

   ...WEST BATON ROUGE PARISH
   ...EAST BATON ROUGE PARISH
   ...LIVINGSTON PARISH
   ...IBERVILLE PARISH
   ...ASCENSION PARISH
   ...ASSUMPTION PARISH
   ...ST JAMES PARISH

AT 825 PM CST...THE EAST BATON ROUGE PARISH OFFICE OF EMERGENCY
PREPAREDNESS REPORTED FLOODING WITH WATER IN A FEW HOMES IN THE
CHANEYVILLE AND WOODLAND RIDGE AREAS. ALSO...HARRELLS FERRY ROAD
AT LAKE PARK WAS UNDER WATER IN WOODLAND RIDGE.

NATIONAL WEATHER SERVICE DOPPLER RADAR SHOWED AN EXTENSIVE AREA OF
MODERATE TO HEAVY RAIN WITH EMBEDDED THUNDERSTORMS ACROSS SOUTHEAST
LOUISIANA IN A NORTH TO SOUTH BAND THROUGH THE BATON ROUGE
METROPOLITAN AREA...PLAQUIMINE AND DONALDSONVILLE. HEAVIER RAIN ALSO
EXTENDED AS FAR EAST AT LIVINGSTON PARISH AND SOUTH THROUGH
ASSUMPTION AND WESTERN TERREBONNE PARISHES.

RAINFALL ESTIMATES BASED ON DOPPLER RADAR AND SURFACE OBSERVATIONS
INDICATED RAIN FALLING AT THE RATE OF 1/2 TO 1 INCH PER HOUR OVER
THE WARNED AREA. THE BATON ROUGE METROPOLITAN AIRPORT HAS MEASURED
1 3/4 OF AN INCH OF RAIN SINCE 5 PM.

THE RAIN WAS MOVING NORTH...BUT NEW THUNDERSTORMS WERE CONTINUING
TO DEVELOP IN THE GULF OF MEXICO AND SPREAD INLAND ACROSS THE
SOUTHEAST LOUISIANA COAST. ADDITIONAL RAIN WILL ONLY CAUSE FLOODING
TO BECOME MORE WIDESPREAD...PARTICULARLY IN URBAN AREAS...NEAR
SMALL STREAMS AND POORLY DRAINED AREAS.

BE ESPECI\ALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLASH FLOODING. IF FLOODING IS OBSERVED...ACT QUICKLY.
MOVE UP TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT TO
FLOODING WHEN WATER BEGINS RISING.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 6, 8:32 PM CST	Flash Flood Warning	LIX	Ascension, East Baton Rouge, Livingston	4 hr
Jan 6, 8:32 PM CST	Flash Flood Warning	LIX	Iberville, West Baton Rouge	4 hr
Jan 6, 9:57 PM CST	Flash Flood Warning	LIX	East Feliciana, Pointe Coupee, West Feliciana	4 hr
Jan 6, 9:57 PM CST	Flash Flood Warning	LIX	Saint Helena, Tangipahoa	4 hr
Jan 6, 11:19 PM CST	Flash Flood Warning	LIX	Jefferson, Orleans, Plaquemines, Saint Bernard	4 hr
Jan 6, 11:19 PM CST	Flash Flood Warning	LIX	Lafourche, Saint Charles, Saint John the Baptist, Terrebonne	4 hr
Jan 7, 1:13 AM CST	Severe Thunderstorm Warning	LIX	Saint Tammany	32 min
Jan 7, 1:31 AM CST	Tornado Warning	LIX	Saint Tammany	19 min
Jan 7, 1:42 AM CST	Flash Flood Warning	LIX	Saint Tammany	3 hr
Jan 7, 5:09 AM CST	Flash Flood Warning	LIX	Saint Tammany	116 min

Nearby

Flash Flood Warnings in Louisiana, 1998 Every flash flood warning in 1998

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.