Alert archive / Louisiana / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 12, NWS Lake Charles, LA

February 21, 1997St. Mary Parish, Louisiana

NWS Lake Charles, LA issued this severe thunderstorm warning at Feb 21, 1997, 2:40 AM CST for St. Mary Parish, Louisiana. It was in force for 50 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
Feb 21, 1997, 2:40 AM CST (08:40 UTC)
Expired
Feb 21, 1997, 3:30 AM CST
In force
50 min
Issued by
NWS Lake Charles, LA
Area
Whole counties

County St. Mary Parish, LA

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Feb 20, 11:45 PM CSTTornado WatchSPC5 hr

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 8.7 hours before the alert went out and 175 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, Lake Charles Mun, LA at 00:00Z on 1997-02-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 873 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, Lake Charles Mun, LA at 00:00Z on 1997-02-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 286 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
873 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
530 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
286 m²/s²
0-3 km storm-relative helicity
305 m²/s²
Significant tornado parameter
1.1
Supercell composite
6.8

Open this sounding in Storm Lab

The text

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

485 
WUUS1 KLCH 210843 RRA
SVRLCH
LAC101-210930-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LAKE CHARLES LA
240 AM CST FRI FEB 21 1997
 
THE NATIONAL WEATHER SERVICE IN LAKE CHARLES HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  330 AM CST
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN SOUTH CENTRAL LOUISIANA
 
   ST. MARY PARISH
 
AND ADJACENT COASTAL WATERS
 
 
AT 235 AM...NATIONAL WEATHER SERVICE DOPPLER RADAR
INDICATED A SEVERE THUNDERSTORM 20 MILES SOUTHWEST OF
THE CITY OF FRANKLIN. MOVEMENT WAS NORTHEAST AT 45 MPH.
THE CITIES OF FRANKLIN AND BALDWIN ARE IN THE PATH OF THIS
STORM. WIND GUSTS IN EXCESS OF 60 MPH AND LARGE HAIL
CAN BE EXPECTED WITH THIS STORM.
 
A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA.  REMEMBER
SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES
WITH LITTLE OR NO ADVANCE WARNING.  REMAIN CALM BUT BE ALERT TO
RAPIDLY CHANGING WEATHER CONDITIONS.

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.

NWS Lake Charles, LA wrote its last area forecast discussion before this severe thunderstorm warning went out at Feb 21, 2:20 AM CST, 20 minutes earlier.

Area forecast discussion, Feb 21, 2:20 AM CST, 20 minutes before
SOUTHEAST TEXAS..SOUTHWEST AND CENTRAL LOUISIANA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAKE CHARLES LA
220 AM CST FRI FEB 21 1997

A BUSY NIGHT AS ACTIVITY INTENSIFIED OVER LA ZONES. UPPER LEVEL
ENERGY NOW LIFTING NE OUT OF AREA. HAVE SEEN 2-3 INCHES OVER
PORTIONS OF S CEN LA...THEREFORE WILL WATCH VERMILION TO SEE HOW
IT RESPONDS NEXT FEW HRS.

AS FOR FORECAST...LIKE NGM HIGHS AS ATMOS DRYS AND HEATS UP TODAY
AHEAD OF COOLER AIR.  SHUD SEE PLENT OF SUN BY LATE MORNING.
WINDS WILL BECOME NORTHWEST THIS AFTERNOON AS DRY FRONT MOVES
THRU. WILL INCLUDE SLGHT CHANCE POPS FOR LFT-AEX LINE EASTWARD
FOR EARLY THIS MORNING AS A FEW SHWRS STILL AROUND IN SW LA.

1

BPT 75/42/59 000
LCH 75/42/57 000  LFT 75/43/57 100  AEX 76/40/56 100

The office that day

Everything else NWS Lake Charles, LA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Feb 20, 11:55 PM CSTSevere Thunderstorm WarningLCHAcadia, Jefferson Davis50 min
Feb 21, 12:48 AM CSTSevere Thunderstorm WarningLCHAvoyelles, Saint Landry42 min

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.