Alert archive / Louisiana / Special Weather Statements in 2012

Special Weather Statement, NWS Lake Charles, LA

December 20, 20124 parishes in Louisiana

NWS Lake Charles, LA issued this special weather statement at Dec 20, 2012, 4:55 AM CST for 4 parishes in Louisiana. It was in force for 65 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Dec 20, 2012, 4:55 AM CST (10:55 UTC)
Expired: Dec 20, 2012, 6:00 AM CST
In force: 65 min
Issued by: NWS Lake Charles, LA

Counties Acadia Parish, LA, Lafayette Parish, LA, Saint Landry Parish, LA, Vermilion Parish, LA

The radar

The Lake Charles radar (KLCH), 115 km from the middle of the area, began a volume at 10:55 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.

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 10.9 hours before the alert went out and 114 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: 386 J/kg
Mixed-layer CIN: -32 J/kg
Mixed-layer LCL: 540 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 243 m²/s²
0-3 km storm-relative helicity: 231 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 3.6

Open this sounding in Storm Lab

The text

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

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Dec 20, 3:16 AM CST, 1 hour 39 minutes earlier.

Area forecast discussion, Dec 20, 3:16 AM CST, 1 hour 39 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAKE CHARLES LA
316 AM CST THU DEC 20 2012

.DISCUSSION...LOTS TO TALK ABOUT THIS MORNING.

TODAY...FIRST..COLD FRONT AND ASSOCIATED SQUALL LINE WILL BE MOVING
THROUGH THE CWA DURING THE NEXT SEVERAL HOURS.  CANNOT RULE OUT SOME
ISOLATED WIND GUSTS TO SEVERE LIMITS MAINLY BEFORE SUNRISE OVER
NORTHERN COUNTIES/PARISHES...OTHERWISE EXPECT 30 TO 40 MPH WIND
GUSTS AS LINE MOVES THROUGH THE REGION.  RAPIDLY CLEARING...
INCREASING NORTHERLY WINDS AND FALLING TEMPERATURES WILL HIGHLIGHT
TODAY.  CURRENT WIND ADVISORY CONFIGURATION ALONG I10 CORRIDOR LOOKS
VERY GOOD AS WIND GUSTS IN EXCESS OF 30 MPH WILL BE LIKELY
ESPECIALLY AFTER 15Z.

TONIGHT...GOOD COLD ADVECTION WILL CONTINUE INTO TONIGHT AND APPEARS
THAT NEAR FREEZING TEMPERATURES SHOULD BE WIDESPREAD NORTH OF
HIGHWAY 190.  FURTHER SOUTH...AM LESS CONFIDENT IN EXTENT OF
FREEZING TEMPERATURES ESPECIALLY OVER ACADIANA. MOS TAKES THESE
SITES CLOSE TO FREEZING AS WELL BUT PAST HISTORY SUGGESTS THAT THIS
IS USUALLY SEVERAL DEGREES TOO COLD.  WILL DEFER THE FREEZE WARNING
ISSUE FOR NOW BUT WILL HIGHLIGHT IN HWO.

FRIDAY THROUGH SATURDAY...HIGH PRESSURE WILL BUILD ACROSS THE AREA
FRIDAY.  A GOOD RADIATIONAL COOLING NIGHT IS ANTICIPATED FOR FRIDAY
NIGHT. SUBFREEZING TEMPERATURES WILL BE LIKELY NORTH OF HIGHWAY 190
WITH TEMPERATURES AGAIN CLOSE TO FREEZING ALONG I10 CORRIDOR. GOOD
WARMUP WILL THEN BEGIN WITH TEMPERATURES REACHING INTO THE 70S.

EXTENDED FORECAST...NEXT FRONTAL BOUNDARY BEGINS TO APPROACH THE
AREA EARLY NEXT WEEK.  BOTH GFS AND ECMWF ARE HINTING AT LOW
PRESSURE WAVES MOVING ALONG THE FRONT ON TUESDAY BEFORE FRONT MOVES
THROUGH REGION ON WEDNESDAY.  CURRENT FORECAST REFLECTS THIS
SCENARIO VERY WELL.  WILL CONTINUE WITH LOW POP FORECAST BEGINNING
SUNDAY WITH CHANCE POPS INTO TUESDAY.  TEMPERATURES SHOULD BE ABOVE
NORMAL FOR CHRISTMAS EVE AND CHRISTMAS DAY WITH COLDER WEATHER
RETURNING BY THE MIDDLE OF NEXT WEEK.

&&

.MARINE...NO CHANGES TO MARINE HAZARDS FOR NOW WITH LOW WATER
ADVISORY FOR BAYS AND GALE WARNINGS FOR OFFSHORE WATERS BEGINNING
TODAY. WINDS AND SEAS SHOULD SUBSIDE THURSDAY NIGHT FOR NEARSHORE
WATERS AND ON FRIDAY OFFSHORE.  RETURN FLOW SHOULD BEGIN TO SET UP
ON SUNDAY.  ALTHOUGH A MODEST INCREASE IN SEAS IS EXPECTED...NO
MARINE HAZARDS ARE EXPECTED FOR EARLY NEXT WEEK.

&&

.PRELIMINARY POINT TEMPS/POPS...
KLCH  64  32  61  33  64 /  10   0   0   0  10
KBPT  63  30  63  34  67 /  10   0   0   0  10
KAEX  60  29  58  30  63 /  10   0   0   0  10
KLFT  63  34  61  34  64 /  30   0   0   0  10

&&

.LCH WATCHES/WARNINGS/ADVISORIES...
LA...WIND ADVISORY FROM 9 AM THIS MORNING TO 6 PM CST THIS EVENING
     FOR THE FOLLOWING ZONES: ACADIA...CALCASIEU...EAST
     CAMERON...IBERIA...JEFFERSON DAVIS...LAFAYETTE...LOWER ST.
     MARTIN...ST. MARY...UPPER ST. MARTIN...VERMILION...WEST
     CAMERON.

     SEVERE THUNDERSTORM WATCH UNTIL 7 AM CST THIS MORNING FOR THE
     FOLLOWING ZONES: AVOYELLES...RAPIDES...VERNON.

TX...WIND ADVISORY FROM 9 AM THIS MORNING TO 6 PM CST THIS EVENING
     FOR THE FOLLOWING ZONES: JEFFERSON...ORANGE.

     SEVERE THUNDERSTORM WATCH UNTIL 7 AM CST THIS MORNING FOR THE
     FOLLOWING ZONES: NORTHERN JASPER...NORTHERN NEWTON...
     SOUTHERN JASPER...SOUTHERN NEWTON...TYLER.

GM...SMALL CRAFT ADVISORY UNTIL 6 AM CST EARLY THIS MORNING FOR THE
     FOLLOWING ZONES: 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 FROM 6 PM THIS EVENING TO 6 AM CST FRIDAY
     FOR THE FOLLOWING ZONES: 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.

     GALE WARNING UNTIL 6 PM CST THIS EVENING FOR THE FOLLOWING
     ZONES: 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.

     LOW WATER ADVISORY UNTIL 6 AM CST FRIDAY FOR THE FOLLOWING
     ZONES: CALCASIEU LAKE...SABINE LAKE...VERMILION BAY.

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

     SMALL CRAFT ADVISORY UNTIL 6 AM CST FRIDAY 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.

&&

In the hours before

Local storm report, Dec 20, 4:08 AM CST, 47 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAKE CHARLES LA
408 AM CST THU DEC 20 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0955 PM     TSTM WND GST     7 S SULPHUR             30.13N 93.36W
12/19/2012  M44.00 MPH       CALCASIEU          LA   AWOS

            KUXL MEASURED A WIND GUST OF 44 MPH.

&&

RDEAL

Local storm report, Dec 20, 4:13 AM CST, 42 minutes before

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Local storm report, Dec 20, 4:17 AM CST, 38 minutes before

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Local storm report, Dec 20, 4:25 AM CST, 30 minutes before

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Local storm report, Dec 20, 4:47 AM CST, 8 minutes before

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Special weather statement, Dec 20, 4:55 AM CST, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 20, 2:18 AM CST	Special Weather Statement	LCH	Vernon	72 min
Dec 20, 3:11 AM CST	Special Weather Statement	LCH	Allen, Beauregard, Calcasieu, Rapides	79 min
Dec 20, 3:20 AM CST	Special Marine Warning	LCH		55 min
Dec 20, 3:35 AM CST	Special Marine Warning	LCH		85 min
Dec 20, 4:04 AM CST	Special Weather Statement	LCH	Acadia, Allen, Avoyelles, Cameron, Evangeline, Jefferson Davis	56 min
Dec 20, 4:35 AM CST	Special Marine Warning	LCH		85 min
Dec 20, 5:37 AM CST	Special Marine Warning	LCH		83 min
Dec 20, 5:49 AM CST	Special Weather Statement	LCH	Saint Martin, St. Mary	71 min
Dec 20, 6:45 AM CST	Special Weather Statement	LCH	St. Mary	60 min
Dec 20, 6:50 AM CST	Special Marine Warning	LCH		55 min
Dec 20, 1:17 AM CST	Special Weather Statement	LCH	Tyler	58 min

Nearby

Special Weather Statements in Louisiana, 2012 Every special weather statement in 2012

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; radar from the NEXRAD Level II archive.