Alert archive / Louisiana / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 53, NWS New Orleans, LA

February 21, 1997Washington Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Feb 21, 1997, 5:06 AM CST for Washington Parish, Louisiana. It was in force for 54 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Feb 21, 1997, 5:06 AM CST (11:06 UTC)
Expired: Feb 21, 1997, 6:00 AM CST
In force: 54 min
Issued by: NWS New Orleans, LA
Area: Whole counties

County Washington Parish, LA

What was reported inside it

Time	Report	Where	Remark
Feb 21, 5:37 AM CST	Thunderstorm Wind	Bogalusa, LA

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 11.1 hours before the alert went out and 75 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: 220 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 509 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 159 m²/s²
0-3 km storm-relative helicity: 201 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.7

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KNEW 211107 RRA
SVRNEW
LAC117-211200-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
506 AM CST FRI FEB 21 1997
 
THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  600 AM CST
FOR RESIDENTS IN THE FOLLOWING LOCATION...
 
IN SOUTHEAST LOUISIANA
 
   ...WASHINGTON PARISH
 
AT 500 AM NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE THUNDERSTORM
LOCATED ABOUT 5 MILES SOUTHWEST OF FRANKLINTON. THE THUNDERSTORM WAS
MOVING NORTHEAST AROUND 30 MILES AN HOUR. COMMUNTIES IN THE PATH OF THIS
THUNDERSTORM INCLUDE FRANKLINTON...PINE...AND VARNADO.
 
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
DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 21, 1:02 AM CST	Severe Thunderstorm Warning	LIX	Pointe Coupee, West Feliciana	58 min
Feb 21, 1:50 AM CST	Severe Thunderstorm Warning	LIX	East Feliciana	55 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.