Alert archive / Louisiana / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 11, NWS Lake Charles, LA

February 18, 2013Allen Parish, Beauregard Parish, Evangeline Parish, Louisiana

NWS Lake Charles, LA issued this severe thunderstorm warning at Feb 18, 2013, 6:31 PM CST for Allen Parish, Beauregard Parish, Evangeline Parish, Louisiana. It was in force for 44 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 18, 2013, 6:31 PM CST (00:31 UTC)
Expired
Feb 18, 2013, 7:15 PM CST
In force
44 min
Issued by
NWS Lake Charles, LA
Area
Storm-based polygon

Counties Allen Parish, LA, Beauregard Parish, LA, Evangeline Parish, LA

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 0.5 hours before the alert went out and 218 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, Shreveport, LA at 00:00Z on 2013-02-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 800 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, Shreveport, LA at 00:00Z on 2013-02-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 361 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
800 J/kg
Mixed-layer CIN
-11 J/kg
Mixed-layer LCL
593 m above ground
0-6 km bulk shear
67 kt
0-1 km storm-relative helicity
361 m²/s²
0-3 km storm-relative helicity
392 m²/s²
Significant tornado parameter
2.0
Supercell composite
6.8

Open this sounding in Storm Lab

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 18, 4:00 PM CST, 2 hours 31 minutes earlier.

Area forecast discussion, Feb 18, 4:00 PM CST, 2 hours 31 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAKE CHARLES LA
400 PM CST MON FEB 18 2013

.DISCUSSION...A FAIRLY WARM AND MOIST AIR MASS HAS ADVECTED IN
DURING THE PAST 12 TO 16 HOURS AHEAD OF AN APPROACHING COLD FRONT
AND SHORT WAVE. AHEAD OF THE SHORT WAVE MEAGER INSTABILITY EXIST IN
A HIGHLY SHEARED ENVIRONMENT. THIS MAY LEAD TO ONE OR TWO ISOLD
STRONG TO SEVERE STORMS THROUGH THE EVENING MAINLY AWAY FROM THE
COOLING EFFECTS OF THE GULF AND FARTHER NORTH AND CLOSER TO THE
BETTER DYNAMICS... OR GENERALLY NORTH OF HWY 190. ALSO FOR THE
REST OF THE AFTERNOON... THE WINDS CONTINUE TO RANGE IN THE 15 TO
25 MPH RANGE WITH HIGHER GUSTS. THE WINDS HAVE DECREASED ACROSS
NORTHWEST SECTIONS OF THE CWA UNDER THE RAIN, HOWEVER WINDS MAY
STILL INCREASE FOR AN HR BEHIND THE STORMS. WILL LET THE WIND ADV
RIDE UNTIL 6 PM.

TONIGHT...THE FRONT WILL MOVE TO BPT LATE IN THE EVENING, TO LCH
AND AEX AROUND MIDNIGHT, AND TO LFT AND ARA EARLY TUE MORNING.
RAIN CHANCES WILL DECREASE BEHIND THE BOUNDARY AS A DRIER AIR MASS
MOVES IN.

TUESDAY A RIDGE WILL QUICKLY MOVE ACROSS THE REGION PROVIDING A
BRIEF BREAK FROM HIGHER RAIN CHANCES. TUE NIGHT A TROUGH WILL DIG
INTO THE SOUTHWEST WITH A LEE SIDE LOW DEVELOPING IN THE PLAINS BY
WED. THIS WILL ALLOW THE RETURN FLOW TO BEGIN AS MOISTURE IS
DRAWN NORTH BETWEEN THE DEPARTING RIDGE AND THE DEVELOPING LOW.
THE SURFACE LOW WILL SLOWLY MOVE ACROSS THE PLAINS AND INTO THE
MIDWEST BY LATE IN THE WEEK. THIS WILL SEND A COLD FRONT INTO OUR
AREA THU AND STALL OVER THE SOUTH HALF OF THE CWA INTO FRI. THE
STALLED BOUNDARY MAY FINALLY BE PUSHED OUT OF THE AREA LATER
FRIDAY, HOWEVER MODELS DO DIFFER AND RAIN MAY LINGER. OPTED TO
KEEP AT LEAST A SLIGHT CHANCE FOR PORTIONS OF THE AREA THROUGH THE
WEEKEND.

&&

.MARINE...A TIGHT PRESSURE GRADIENT WILL CONTINUE TO KEEP WINDS
AROUND 20KTS OR HIGHER THROUGH THE EVENING. A COLD FRONT WILL
ENTER THE COASTAL WATERS AROUND MIDNIGHT WITH WINDS SLIGHTLY
DECREASING AHEAD OF THE BOUNDARY, HOWEVER AS THE BOUNDARY PASSES
WINDS WILL INCREASE BACK INTO SCA CRITERIA AS HIGH PRESSURE BUILDS
IN. THE RIDGE WILL QUICKLY MOVE ACROSS THE SOUTH TUESDAY WITH THE
SOUTH FLOW RETURNING TUE NIGHT. ANOTHER SYSTEM WILL TAKE SHAPE WED
WITH WINDS AGAIN RAMPING UP TO SCA CONDITIONS LATE WED THROUGH THU.

&&

.PRELIMINARY POINT TEMPS/POPS...
KLCH  53  67  44  61  52 /  60  10  10  30  30
KBPT  51  68  47  61  56 /  60  10  10  40  40
KAEX  46  62  40  55  45 /  80  10  10  30  40
KLFT  53  66  44  61  52 /  80  10  10  20  20

&&

.LCH WATCHES/WARNINGS/ADVISORIES...
LA...WIND ADVISORY UNTIL 6 PM CST THIS EVENING FOR THE FOLLOWING
     ZONES: ACADIA...ALLEN...AVOYELLES...BEAUREGARD...
     CALCASIEU...EAST CAMERON...EVANGELINE...IBERIA...JEFFERSON
     DAVIS...LAFAYETTE...LOWER ST. MARTIN...RAPIDES...ST.
     LANDRY...ST. MARY...UPPER ST. MARTIN...VERMILION...VERNON...
     WEST CAMERON.

TX...WIND ADVISORY UNTIL 6 PM CST THIS EVENING FOR THE FOLLOWING
     ZONES: HARDIN...JEFFERSON...NORTHERN JASPER...NORTHERN
     NEWTON...ORANGE...SOUTHERN JASPER...SOUTHERN NEWTON...TYLER.

GM...SMALL CRAFT ADVISORY UNTIL NOON CST TUESDAY FOR THE FOLLOWING
     ZONES: COASTAL WATERS FROM CAMERON LA TO HIGH ISLAND TX OUT
     20 NM...COASTAL WATERS FROM INTRACOASTAL CITY TO CAMERON LA
     OUT 20 NM...COASTAL WATERS FROM LOWER ATCHAFALAYA RIVER TO
     INTRACOASTAL CITY LA OUT 20 NM...WATERS FROM INTRACOASTAL
     CITY TO CAMERON LA FROM 20 TO 60 NM...WATERS FROM CAMERON
     LA TO HIGH ISLAND TX FROM 20 TO 60 NM...WATERS FROM LOWER
     ATCHAFALAYA RIVER TO INTRACOASTAL CITY LA FROM 20 TO 60 NM.

     SMALL CRAFT ADVISORY UNTIL 6 PM CST THIS EVENING FOR THE
     FOLLOWING ZONES: CALCASIEU LAKE...SABINE LAKE...VERMILION
     BAY.

&&
Hazardous weather outlook, Feb 18, 4:48 AM CST, 13 hours 43 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LAKE CHARLES LA
448 AM CST MON FEB 18 2013

LAZ027>033-041>045-052>055-073-074-TXZ180-201-215-216-259>262-
191200-
VERNON-RAPIDES-AVOYELLES-BEAUREGARD-ALLEN-EVANGELINE-ST. LANDRY-
CALCASIEU-JEFFERSON DAVIS-ACADIA-LAFAYETTE-UPPER ST. MARTIN-
VERMILION-IBERIA-ST. MARY-LOWER ST. MARTIN-WEST CAMERON-
EAST CAMERON-TYLER-HARDIN-JEFFERSON-ORANGE-NORTHERN JASPER-
NORTHERN NEWTON-SOUTHERN JASPER-SOUTHERN NEWTON-
448 AM CST MON FEB 18 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL
LOUISIANA...SOUTH CENTRAL LOUISIANA...SOUTHWEST LOUISIANA...WEST
CENTRAL LOUISIANA AND SOUTHEAST TEXAS.

.DAY ONE...TODAY AND TONIGHT

VERY BREEZY AND GUSTY SOUTH WINDS WILL OCCUR FROM MID MORNING
THROUGH SUNSET...ESPECIALLY ALONG AND SOUTH OF THE I-10
CORRIDOR...AS A DEEP LOW PRESSURE SYSTEM MOVES OUT OF THE PLAINS.
A WIND ADVISORY WILL BE IN EFFECT TO ACCOUNT FOR SUSTAINED WINDS
BETWEEN 20 AND 25 MPH WITH GUSTS TO 30 MPH.

A COLD FRONT WILL MOVE ACROSS DURING THE EVENING HOURS THROUGH
SHORTLY AFTER MIDNIGHT. NUMEROUS SHOWERS AND A FEW THUNDERSTORMS
WILL DEVELOP WITH THIS SYSTEM. AT THIS TIME...THE POTENTIAL FOR
STRONG THUNDERSTORMS IS LOW. ALTHOUGH SOME GUSTY WINDS AND LOCALLY
HEAVY RAINFALL MAY ACCOMPANY THE LINE OF SHOWERS AND ISOLATED
THUNDERSTORMS AS IT MOVE ACROSS AHEAD OF THE COLD FRONT.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

ANOTHER STORM SYSTEM WILL MOVE ACROSS ON THURSDAY. THIS SYSTEM
IS FORECAST TO BE A LITTLE MORE POTENT. THEREFORE...SOME STRONG
THUNDERSTORMS WILL BE POSSIBLE WITH GUSTY WINDS...LOCALLY HEAVY
RAINFALL...AND CLOUD TO GROUND LIGHTNING STRIKES.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED.

GMZ430-432-435-450-452-455-470-472-475-191200-
SABINE LAKE-CALCASIEU LAKE-VERMILION BAY-
COASTAL WATERS FROM CAMERON LA TO HIGH ISLAND TX OUT 20 NM-
COASTAL WATERS FROM INTRACOASTAL CITY TO CAMERON LA OUT 20 NM-
COASTAL WATERS FROM LOWER ATCHAFALAYA RIVER TO INTRACOASTAL CITY
LA OUT 20 NM-
WATERS FROM CAMERON LA TO HIGH ISLAND TX FROM 20 TO 60 NM-
WATERS FROM  INTRACOASTAL CITY TO CAMERON LA FROM 20 TO 60 NM-
WATERS FROM LOWER ATCHAFALAYA RIVER TO INTRACOASTAL CITY LA FROM
20 TO 60 NM-
448 AM CST MON FEB 18 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF THE NORTHWEST
GULF OF MEXICO.

.DAY ONE...TODAY AND TONIGHT
STRONG SOUTH WINDS CAN BE EXPECTED THROUGH THIS EVENING AS DEEP
LOW PRESSURE SYSTEM MOVES ACROSS THE PLAINS. MODERATE TO STRONG
NORTH WINDS WILL THEN DEVELOP BEHIND A COLD FRONT LATER TONIGHT. A
SMALL CRAFT ADVISORY WILL BE IN EFFECT TO ACCOUNT FOR THIS.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY
ANOTHER STORM SYSTEM WILL DEVELOP BY WEDNESDAY OVER THE ROCKIES
AND MOVE ACROSS ON THURSDAY. MODERATE TO STRONG WINDS WILL AGAIN
BE LIKELY AHEAD OF THIS SYSTEM. SOME STRONG STORMS WILL ALSO BE
POSSIBLE ON THURSDAY AFTERNOON WITH THIS SYSTEM.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED.

RUA

In the hours before

Local storm report, Feb 18, 6:29 PM CST, 2 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Feb 18, 8:55 PM CSTSpecial Weather StatementLCHCameron35 min
Feb 18, 9:28 PM CSTSpecial Weather StatementLCHCameron32 min
Feb 19, 2:41 PM CSTSmall Craft AdvisoryLCH54 hr

Nearby

Severe Thunderstorm Warnings in Louisiana, 2013Every severe thunderstorm warning in 2013

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.