Alert archive / Louisiana / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 307, NWS New Orleans, LA

December 23, 1997Lafourche Parish, Terrebonne Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Dec 23, 1997, 8:46 AM CST for Lafourche Parish, Terrebonne Parish, Louisiana. It was in force for 64 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Dec 23, 1997, 8:46 AM CST (14:46 UTC)
Expired
Dec 23, 1997, 9:50 AM CST
In force
64 min
Issued by
NWS New Orleans, LA
Area
Whole counties

Counties Lafourche Parish, LA, Terrebonne Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 2.8 hours before the alert went out and 128 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 1997-12-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 1997-12-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 270 square meters per square second.1939587897117136Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1986 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
270 m²/s²
0-3 km storm-relative helicity
387 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.

958 
WUUS1 KNEW 231442 RRA
SVRNEW
LAC057-109-231550-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
846 AM CST TUE DEC 23 1997

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS LA HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 950 AM CST
FOR PEOPLE IN THE FOLLOWING LOCATIONS...

IN SOUTHEASTERN LOUISIANA

   ...NORTHERN TERREBONNE PARISH
   ...NORTHERN LAFOURCHE PARISH

AT 840 AM CST RADAR SHOWED A SEVEFRE THUNDERSTORM WITH LARGE HAIL
ABOUT 9 MILES SOUTHWEST OF HOUMA MOVING NORTHEAST ABOUT 20 MILES AN
HOUR. TOWNS IN THE PATH OF THE SEVERE THUNDERSTORM INCLUDE HOUMA...
AND LAFOURCHE.

IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER FROM THE WEATHER IN A
STRONG BUILDING.  DAMAGING WIND...LARGE HAIL...VERY HEAVY RAIN...
AND DEADLY LIGHTNING ARE ALL POSSIBLE IN SEVERE THUNDERSTORMS.
STAY INSIDE AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.

What forecasters said that day

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

In the hours before

Special weather statement, Dec 23, 7:37 AM CST, 1 hour 9 minutes before
LAZ034>040-046>050-056>070-MSZ068>071-077-080>082-231700-

THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE NEW ORLEANS LA
737 AM CST TUE DEC 23 1997

A PACIFIC LOW PRESSURE SYSTEM WILL MOVE EAST INTO SOUTH TEXAS THEN
NORTHEAST TO NORTHERN LOUISIANA DURING THE NEXT 24 HOURS. COPIOUS
MOISTURE, AN UPPER LEVEL LOW, AND A SURFACE COLD FRONT WILL CAUSE
SCATTERED TO NUMEROUS THUNDERSTORMS AROUND THE FORECAST AREA MAINLY THIS
AFTERNOON AND TONIGHT. SCATTERED THUNDERSTORMS WILL AFFECT SOUTHCENTRAL
AND SOUTHEAST LOUISIANA PLUS SOUTHWEST MISSISSIPPI AND THE MISSISSIPPI
GULF COAST THIS MORNING THEN BECOME MORE NUMEROUS THIS AFTERNOON AND
TONIGHT. HEAVY RAIN CAN BE EXPECTED IN STORMS. THERE IS A POTENTIAL FOR
DAMAGING HIGH WINDS AND HAIL IN THE STRONGER STORMS. AREA RESIDENTS ARE
URGED TO KEEP TUNED FOR THE LATEST UPDATES ON THIS WEATHER SITUATION.

THIS AND OTHER WEATHER INFORMATION CAN BE ACCESSED THROUGH NOAA WEATHER
RADIO...LOCAL TELEVISION AND RADIO STATIONS...CABLE OUTLETS...OR FROM
OUR INTERNET WEB PAGE AT HTTP://WWW.SRH.NOAA.GOV (LOWER CASE) UNDER
FORECAST OFFICES.

Nearby

Severe Thunderstorm Warnings in Louisiana, 1997Every severe thunderstorm warning in 1997

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.