Alert archive / Louisiana / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 280, NWS New Orleans, LA

October 1, 1997Lafourche Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Oct 1, 1997, 4:27 PM CDT for Lafourche Parish, Louisiana. It was in force for 48 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: Oct 1, 1997, 4:27 PM CDT (21:27 UTC)
Expired: Oct 1, 1997, 5:15 PM CDT
In force: 48 min
Issued by: NWS New Orleans, LA
Area: Whole counties

County Lafourche Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 9.5 hours before the alert went out and 107 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: 891 J/kg
Mixed-layer CIN: -73 J/kg
Mixed-layer LCL: 1213 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 10 m²/s²
0-3 km storm-relative helicity: 3 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.

916 
WUUS1 KNEW 012131 RRA
SVRNEW
LAC057-012215-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
427 PM CDT WED OCT 1 1997
 
THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  515 PM CDT
FOR RESIDENTS IN THE FOLLOWING LOCATION...
 
IN SOUTHEAST LOUISIANA
 
   ...LAFOURCHE PARISH
 
AND THE ADJACENT COASTAL WATERS
 
AT 4:27 PM CDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
A CLUSTER OF SEVERE THUNDERSTORMS MOVING INTO LAFOUCHE FROM NORTH
OF THIBODAUX TO DES ALLEMANDS. THESE THUNDERSTORMS WERE MOVING
SOUTH AT 15 MPH. THE COMMUNITIES IN THE PATH OF THIS STORM INCLUDE
THIBODAUX..RACELAND AND LAROSE. THESE STORMS PRODUCE WIND GUSTS
OF 55 MPH IN ST. CHARLES PARISH.
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR
OF YOUR HOME OR BUSINESS.  HEAVY RAINS FLOOD ROADS QUICKLY SO
DONT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

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, Oct 1, 11:00 AM CDT, 5 hours 27 minutes before

LAZ034>040-046>049-056>070-MSZ068>071-080>082-011600-

THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE NEW ORLEANS/BATON ROUGE LA
1100 AM CDT WED OCT 1 1997

...NO SEVERE THUNDERSTORMS ARE EXPECTED THIS AFTERNOON...

WIDELY SCATTERED SHOWERS ARE POSSIBLE OVER SOUTHEAST LOUISIANA AND
SOUTH MISSISSIPPI AHEAD OF AND ALONG A WEAK COLD FRONT AS IT MOVES
SOUTH ACROSS THE AREA THIS AFTERNOON.

TUNE IN TO NOAA WEATHER RADIO...LOCAL RADIO AND TV STATIONS
...CABLE OUTLETS...OR CONTACT OUR INTERNET HOMEPAGE AT
HTTP://WWW.SRH.NOAA.GOV (IN LOWER CASE) UNDER FORECAST OFFICES
FOR FURTHER INFORMATION ON CURRENT WEATHER CONDITIONS.

Special weather statement, Oct 1, 11:08 AM CDT, 5 hours 19 minutes before

LAZ034>040-046>049-056>070-MSZ068>071-080>082-011600-

THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE NEW ORLEANS/BATON ROUGE LA
1100 AM CDT WED OCT 1 1997

...NO SEVERE THUNDERSTORMS ARE EXPECTED THIS AFTERNOON...

WIDELY SCATTERED SHOWERS ARE POSSIBLE OVER SOUTHEAST LOUISIANA AND
SOUTH MISSISSIPPI AHEAD OF AND ALONG A WEAK COLD FRONT AS IT MOVES
SOUTH ACROSS THE AREA THIS AFTERNOON.

TUNE IN TO NOAA WEATHER RADIO...LOCAL RADIO AND TV STATIONS
...CABLE OUTLETS...OR CONTACT OUR INTERNET HOMEPAGE AT
HTTP://WWW.SRH.NOAA.GOV (IN LOWER CASE) UNDER "FORECAST OFFICES"
FOR FURTHER INFORMATION ON CURRENT WEATHER CONDITIONS.

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 1, 4:15 PM CDT	Severe Thunderstorm Warning	LIX	Saint Charles, Saint John the Baptist	30 min
Oct 1, 5:15 PM CDT	Severe Thunderstorm Warning	LIX	Lafourche, Terrebonne	60 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 1997 Every 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.