Alert archive / Louisiana / Tornado Warnings in 1999

Tornado Warning 45, NWS Lake Charles, LA

March 13, 1999Saint Martin Parish, Louisiana

NWS Lake Charles, LA issued this tornado warning at Mar 13, 1999, 12:34 PM CST for Saint Martin Parish, Louisiana. It was in force for 46 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
Mar 13, 1999, 12:34 PM CST (18:34 UTC)
Expired
Mar 13, 1999, 1:20 PM CST
In force
46 min
Issued by
NWS Lake Charles, LA
Area
Whole counties

County Saint Martin Parish, LA

The watch it was issued in

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

IssuedProductOfficeLasted
Mar 13, 10:00 AM CSTTornado WatchSPC5 hr

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 6.6 hours before the alert went out and 153 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 12:00Z on 1999-03-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 759 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 12:00Z on 1999-03-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 259 square meters per square second.19395878Sfc1 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
759 J/kg
Mixed-layer CIN
-35 J/kg
Mixed-layer LCL
639 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
259 m²/s²
0-3 km storm-relative helicity
311 m²/s²
Significant tornado parameter
1.3
Supercell composite
7.8

Open this sounding in Storm Lab

The text

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

999 
WFUS1 KLCH 131836 RRA
TORLCH
LAC099-131920-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE LAKE CHARLES LA
1234 PM CST SAT MAR 13 1999

THE NATIONAL WEATHER SERVICE IN LAKE CHARLES HAS ISSUED A

* TORNADO WARNING FOR...
  UPPER ST. MARTIN PARISH IN SOUTH CENTRAL LOUISIANA

* UNTIL 120 PM CST

* AT 1232 PM CST... NATIONAL WEATHER SERVICE DOPPLER RADAR
  INDICATED A TORNADO 7 MILES NORTHWEST OF ST. MARTINVILLE OR 5
  MILES WEST OF PARKS MOVING NORTHEAST AT 35 MPH.

* THE TORNADIC THUNDERSTORM WILL BE NEAR
  PARKS BY 1240 PM CST
  BREAUX BRIDGE BY 1240 PM CST
  CECILIA BY 1245 PM CST
  HENDERSON BY 1250 PM CST

IF YOU ARE IN THE PATH OF THIS STORM...TAKE COVER QUICKLY.

What forecasters said that day

The local office's own words before this tornado 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 tornado warning went out at Mar 13, 8:30 AM CST, 4 hours 4 minutes earlier.

Area forecast discussion, Mar 13, 8:30 AM CST, 4 hours 4 minutes before
SOUTHWEST...CENTRAL LOUISIANA AND SOUTHEAST TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAKE CHARLES LA
830 AM CST SAT MAR 13 1999

LOOPING WATER VAPOR IMAGERY REVEALS COLD AIR SPILLING ACROSS WESTERN
TEXAS...MERIDIONAL POTENTIAL ENERGY IS BEING EXPENDED (CONVERTED TO
KINETIC ENERGY) AS THE ATMOSPHERE MOVES TOWARD EQUILIBRIUM.

FIRST PROBLEM...THE SURFACE ANALYSIS DOES NOT REVEAL THE BAROCLINIC
SEEDLING (SURFACE CYCLONE) THAT WILL RECEIVE THIS KINETIC ENERGY.
THE MAPS FCST GUIDANCE SPINS-UP A CYCLONE OVER WEST CENTRAL LOUISIANA
...FORECAST TO OCCLUDE OVER NORTHEAST LOUISIANA BY THIS EVENING. THIS
SOLUTION SEEMS REASONABLE PROVIDED THE FOLLOWING SCENARIO UNFOLDS...
NAMELY THE 850 MB LOW (SITUATED OVER THE EASTERN TEXAS-OKLAHOMA
BORDER) DEEPENS EASTWARD TOWARD THE SURFACE.

WITH CP AIR SPILLING ACROSS THE FCST AREA IN WAKE OF FRONT...BRISK
NORTHERLIES WILL PREVAIL ACROSS THE COASTAL WATERS. DOWNWARD
MOMENTUM TRANSFER MAY BRING THE NORTHERLIES ACROSS THE COASTAL WATERS
(FROM HIGH ISLAND TO WHITE LAKE) TO NEAR GALE FORCE SUN MORNING.

7/21

BPT CE 68 (FALL 57)/43/53/34 6(EARLY)000
LCH CE 66 (FALL 56)/43/53/33 8(EARLY)000
LFT CE 65 (FALL 57)/45/53/33 9(MORNING)000
AEX CE 62 (FALL 52)/40/50/29 9(MORNING)000

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 13, 1:01 AM CSTSevere Thunderstorm WarningLCHVernon64 min
Mar 13, 8:02 AM CSTTornado WarningLCHEvangeline63 min
Mar 13, 8:22 AM CSTTornado WarningLCHSaint Landry33 min
Mar 13, 11:33 AM CSTTornado WarningLCHVermilion47 min

Nearby

Tornado Warnings in Louisiana, 1999Every tornado warning in 1999Tornadoes in 1999

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.