Alert archive / Louisiana / Tornado Warnings in 1999

Tornado Warning 44, NWS Lake Charles, LA

March 13, 1999Vermilion Parish, Louisiana

NWS Lake Charles, LA issued this tornado warning at Mar 13, 1999, 11:33 AM CST for Vermilion Parish, Louisiana. It was in force for 47 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
Mar 13, 1999, 11:33 AM CST (17:33 UTC)
Expired
Mar 13, 1999, 12:20 PM CST
In force
47 min
Issued by
NWS Lake Charles, LA
Area
Whole counties

County Vermilion Parish, LA

The radar

The Lake Charles radar (KLCH), 95 km from the middle of the area, began a volume at 17:32 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

TimeReportWhereRemark
Mar 13, 11:45 AM CSTTornado F0Gueydan, 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

Lake Charles Mun, LA (KLCH), launched 12:00Z, 5.6 hours before the alert went out and 93 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 131736 RRA
TORLCH
LAC113-131820-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE LAKE CHARLES LA
1133 AM CST SAT MAR 13 1999

THE NATIONAL WEATHER SERVICE IN LAKE CHARLES HAS ISSUED A

* TORNADO WARNING FOR...
  VERMILION PARISH IN SOUTHWESTERN LOUISIANA

* UNTIL 1220 PM CST

* AT 1132 AM CST... NATIONAL WEATHER SERVICE DOPPLER RADAR
  INDICATED A TORNADO 5 MILES NORTH OF ABBEVILLE OR 4 MILES
  SOUTHWEST OF MAURICE MOVING NORTHEAST AT 35 MPH.

* THE TORNADIC THUNDERSTORM WILL BE NEAR
  MAURICE BY 1140 AM CST

THIS IS A DANGEROUS STORM SITUATION. ACT QUICKLY. GO TO A
SMALL INTERIOR ROOM ON THE LOWEST FLOOR. AVOID WINDOWS AND
DOORS. ABANDON CARS AND MOBILE HOMES FOR A STURDIER BUILDING
OR GET INTO A DITCH OR CULVERT.

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, 3 hours 3 minutes earlier.

Area forecast discussion, Mar 13, 8:30 AM CST, 3 hours 3 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, 12:34 PM CSTTornado WarningLCHSaint Martin46 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.