Alert archive / Louisiana / Flash Flood Warnings in 1998

Flash Flood Warning 14, NWS New Orleans, LA

January 12, 1998Saint Tammany Parish, Tangipahoa Parish, Louisiana

NWS New Orleans, LA issued this flash flood warning at Jan 12, 1998, 8:03 AM CST for Saint Tammany Parish, Tangipahoa Parish, Louisiana. It was in force for 3 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 12, 1998, 8:03 AM CST (14:03 UTC)
Expired
Jan 12, 1998, 11:05 AM CST
In force
3 hr
Issued by
NWS New Orleans, LA
Area
Whole counties

Counties Saint Tammany Parish, LA, Tangipahoa Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 2.1 hours before the alert went out and 55 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, Slidell Radar S, LA at 12:00Z on 1998-01-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 265 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Slidell Radar S, LA at 12:00Z on 1998-01-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 411 square meters per square second.1939587897Sfc1 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
265 J/kg
Mixed-layer CIN
-17 J/kg
Mixed-layer LCL
499 m above ground
0-6 km bulk shear
75 kt
0-1 km storm-relative helicity
411 m²/s²
0-3 km storm-relative helicity
492 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KNEW 121404
FFWNEW
LAC103-105-121705-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
803 AM CST MON JAN 12 1998

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS LA HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL 1105 AM CST
FOR PEOPLE IN THE FOLLOWING LOCATIONS...

IN SOUTHEASTERN LOUISIANA

   ...TANGIPAHOA PARISH
   ...ST TAMMANY PARISH


AT 8 AM CST...RADAR INDICATED TORRENTIAL RAINFALL WITH RATES OF 2
INCHES PER HOUR ACROSS THE NORTHERN PART OF ST. TAMMANY PARISH AND
CENTRAL TANGIPAHOA PARISH. SOME ROADWAYS IN THE FOLSOM AREA WERE
REPORTED FLOODED ALREADY THIS MORNING. WITH THE SATURATED GROUND
CONDITIONS FROM RECENT HEAVY RAINS...FLOODING WILL OCCUR QUICKLY.

ALSO...STAY AWAY FROM RIVERS AND STREAMS. THESE WATERWAYS WILL RISE
RATHER QUICKLY TODAY.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO
CROSS SAFELY. VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED
QUICKLY. MOVE TO HIGHER GROUND.

The office that day

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

IssuedProductOfficeCountiesLasted
Jan 12, 2:43 AM CSTSevere Thunderstorm WarningLIXPointe Coupee, West Feliciana62 min
Jan 12, 4:46 AM CSTSevere Thunderstorm WarningLIXPointe Coupee74 min
Jan 12, 6:33 AM CSTSevere Thunderstorm WarningLIXEast Baton Rouge, Livingston62 min
Jan 12, 7:12 AM CSTSevere Thunderstorm WarningLIXSaint Tammany, Tangipahoa63 min
Jan 12, 7:41 AM CSTSevere Thunderstorm WarningLIXTangipahoa119 min
Jan 12, 8:46 AM CSTSevere Thunderstorm WarningLIXSaint Tammany59 min
Jan 12, 10:50 AM CSTTornado WarningLIXOrleans35 min

Nearby

Flash Flood Warnings in Louisiana, 1998Every 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.