Alert archive / Louisiana / Special Weather Statements in 2012

Special Weather Statement, NWS Lake Charles, LA

August 10, 2012St. Mary Parish, Louisiana

NWS Lake Charles, LA issued this special weather statement at Aug 10, 2012, 2:31 PM CDT for St. Mary Parish, Louisiana. It was in force for 59 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: Aug 10, 2012, 2:31 PM CDT (19:31 UTC)
Expired: Aug 10, 2012, 3:30 PM CDT
In force: 59 min
Issued by: NWS Lake Charles, LA

County St. Mary Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 7.5 hours before the alert went out and 154 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: 3400 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 530 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 75 m²/s²
0-3 km storm-relative helicity: 96 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Aug 10, 2:10 PM CDT, 21 minutes earlier.

Area forecast discussion, Aug 10, 2:10 PM CDT, 21 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAKE CHARLES LA
210 PM CDT FRI AUG 10 2012

.AVIATION...
ALL TAF SITES ARE VFR AS STORMS ARE SOUTH OF AVIATION LOCATIONS.
OTHERWISE VFR SHOULD HOLD INTO THE EVENING HOURS. THERE IS SOME
STORMS DEVELOPING NORTHEAST OF AEX ALONG THE FRONTAL BOUNDARY.
WILL WATCH THE BOUNDARY TO CHECK ANY DEVELOP OVER THE NEXT SEVERAL
HOURS.

&&

.PREV DISCUSSION... /ISSUED 1044 AM CDT FRI AUG 10 2012/

DISCUSSION...
RECENT RADAR MOSAIC IMAGES INDICATE THAT THE CONVECTIVE COMPLEX
OVER CNTL LA EARLY THIS MORNING HAS DISSIPATED...WITH NEW
CONVECTION DEVELOPING JUST SOUTH OF THAT AREA WITHIN THE PAST
HOUR. ELSEWHERE...A BAND OF SHOWERS AND THUNDERSTORMS CONTINUES
OVER THE EASTERN COASTAL WATERS.

IN THE UPPER LEVELS...THE AREA REMAINED BETWEEN HIGH PRESSURE TO
THE WEST AND A TROF OVER THE ERN CONUS...WHILE A SFC FRONTAL
BOUNDARY EXTENDED FM NEAR OXFORD MS ACRS THE LA/AR BORDER TOWARD
CORSICANA TX. SOUTH OF THE BOUNDARY...DEEP MOISTURE REMAINS IN
PLACE WITH PW VALUES AROUND 2 INCHES PER THIS MORNINGS
SOUNDINGS...WHICH COMBINED WITH AFTN HEATING AND DISTURBANCES
TRAVELING INTO THE AREA ON NLY FLOW ALOFT...WILL ALLOW FOR AN
INCREASE IN SHOWERS AND THUNDERSTORMS OVER THE AREA TODAY....WITH
THE GREATEST CONCENTRATION OVER THE ERN HALF OF THE AREA. AS WAS
THE CASE YESTERDAY...SOME STORMS COULD BE STRONG...WITH
CONSIDERABLE CLOUD TO GROUND LIGHTNING...VERY HEAVY RAIN AND GUSTY
WINDS POSSIBLE.

MADE SOME MINOR ADJUSTMENTS TO POP/WX AND WIND GRIDS THIS
MORNING...BUT NOTHING SIGNIFICANT ENOUGH TO WARRANT AN UPDATE TO
TEXT PRODUCTS AT THIS TIME.

24

PREV DISCUSSION... /ISSUED 329 AM CDT FRI AUG 10 2012/

DISCUSSION...COLD FRONT CURRENTLY DRAPED THROUGH NE-SW
ARKANSAS...THEN ARCING ACROSS NORTH TEXAS. RADAR SHOWING CLUSTERS OF
CONVECTION ONGOING SOUTH OF BOUNDARY ACROSS EAST TEXAS AND
LOUISIANA. MID-LEVEL SYNOPTIC TROF NOW ADVANCING EAST OF THE
AREA...BUT SUFFICIENT MOISTURE POST-TROF FOR CONTINUED ACTIVITY
TODAY AS IMPULSES DROP S/SE THROUGH NORTHERLY FLOW ALOFT AHEAD OF
FRONT.

THUS SCATTERED SHOWERS AND THUNDERSTORMS IN THE FORECAST AGAIN
TODAY...WITH BEST CHANCES EAST...TAPERING OFF TO THE WEST.
COLD FRONT PROGGED TO ADVANCE SOUTH INTO CENTRAL LOUISIANA THIS
EVENING AND REACH THE COAST TOWARD SUNRISE SATURDAY WHERE IT IS
EXPECTED TO STALL. WILL BE MAINTAINING RAIN CHANCES INTO SATURDAY
AS A WEAK WAVE DEVELOPS ALONG THE BOUNDARY AND ADVANCES EAST ACROSS
COASTAL LOUISIANA.

ADDED NOTE...SURFACE ANALYSIS SHOWING SBCAPES IN A 2-4K J/KG
RANGE ALONG AND SOUTH OF THE INTERSTATE 10 CORRIDOR.
ADDITIONALLY...AN ENHANCED ZONE OF LOW LEVEL CONVERGENCE IS IN
PLACE ACROSS THIS AREA. COULD SEE SOME RATHER HEALTHY STORMS
DEVELOP AS IMPULSES AS WELL AS CONVECTIVE OUTFLOWS MIGRATE INTO
THIS AREA.

MARINE...WIND WILL GENERALLY REMAIN LIGHT AND SEAS LOW INTO THE
COMING WEEK AS HIGH PRESSURE CONTINUES TO RIDGES ACROSS THE
NORTHERN GULF. SHOWER AND THUNDERSTORM ACTIVITY WILL DIMINISH
LATE IN THE WEEKEND AS HIGH PRESSURE AND MUCH DRIER AIR ALOFT
BECOMES REESTABLISHED OVER THE NORTHWEST GULF.

23

&&

.PRELIMINARY POINT TEMPS/POPS...
KLCH  77  91  75  92  75 /  30  30  10  10  10
KBPT  77  91  77  93  75 /  30  30  10  10  10
KAEX  73  91  71  94  70 /  40  20   0   0  10
KLFT  75  89  73  93  75 /  40  30  10  10  10

&&

.LCH WATCHES/WARNINGS/ADVISORIES...
LA...NONE.
TX...NONE.
GM...NONE.
&&

Hazardous weather outlook, Aug 10, 4:00 AM CDT, 10 hours 31 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LAKE CHARLES LA
400 AM CDT FRI AUG 10 2012

LAZ027>033-041>045-052>055-073-074-TXZ180-201-215-216-259>262-
110900-
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-
400 AM CDT FRI AUG 10 2012

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

SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED TODAY. TYPICAL BRIEF
HEAVY RAINS AND CONSIDERABLE CLOUD TO GROUND LIGHTNING WILL
ACCOMPANY THIS ACTIVITY. NO ORGANIZED SEVERE THUNDERSTORMS ARE
ANTICIPATED...BUT A PULSE THUNDERSTORM BRIEFLY REACHING SEVERE LIMITS
CANNOT BE RULED OUT.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

SHOWER AND THUNDERSTORM ACTIVITY IS EXPECTED TO CONTINUE INTO SATURDAY
AS A WEAK COLD FRONT SLIDES ACROSS THE FORECAST AREA AND STALLS
NEAR THE COAST. AS WILL BE THE CASE TODAY...NO ORGANIZED SEVERE
THUNDERSTORMS ARE ANTICIPATED....BUT A PULSE THUNDERSTORM BRIEFLY
REACHING SEVERE LIMITS CANNOT BE RULED OUT.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL LIKELY NOT BE REQUIRED.

GMZ430-432-435-450-452-455-470-472-475-110900-
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-
400 AM CDT FRI AUG 10 2012

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

.DAY ONE...TODAY AND TONIGHT

WIDELY SCATTERED SHOWERS AND THUNDERSTORMS CAN BE EXPECTED TODAY
AND TONIGHT.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

WIDELY SCATTERED SHOWERS AND THUNDERSTORMS WILL CONTINUE SATURDAY...WITH
CHANCES LOWERING GOING INTO THE NEW WEEK.

.SPOTTER INFORMATION STATEMENT...

In the hours before

Special weather statement, Aug 10, 2:31 PM CDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LAKE CHARLES LA
231 PM CDT FRI AUG 10 2012

LAZ054-055-102030-
LOWER ST. MARTIN LA-ST. MARY LA-
231 PM CDT FRI AUG 10 2012

...SIGNIFICANT WEATHER ADVISORY FOR ST. MARY AND ST. MARTIN PARISHES
UNTIL 330 PM CDT...

AT 218 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
STRONG THUNDERSTORM 2 MILES SOUTH OF STEPHENSVILLE...MOVING SOUTHEAST
AT 15 MPH.

* THE STRONG THUNDERSTORM WILL BE NEAR...
  AMELIA BY 240 PM...

THE PRIMARY THREATS FROM THIS STORM ARE FREQUENT LIGHTNING AND WIND
GUSTS TO NEAR 45 MPH...WHICH COULD DOWN TREE LIMBS AND BLOW AROUND
UNSECURED SMALL OBJECTS.

THIS STORM COULD ALSO PRODUCE RAINFALL AMOUNTS OF TWO INCHES IN A
SHORT PERIOD OF TIME...RESULTING IN PONDING OF WATER AROUND LOW
LYING ROADWAYS.

LAT...LON 2952 9121 2952 9122 2971 9138 2986 9119
      2984 9113 2981 9109 2975 9108 2973 9110
      2965 9110 2963 9108 2960 9107

K. KUYPER

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 9, 7:46 PM CDT	Special Weather Statement	LCH	St. Mary	59 min
Aug 9, 11:18 PM CDT	Severe Thunderstorm Warning	LCH	Avoyelles, Rapides	72 min
Aug 10, 12:31 AM CDT	Special Weather Statement	LCH	Avoyelles	59 min
Aug 10, 1:34 AM CDT	Severe Thunderstorm Warning	LCH	Rapides, Vernon	35 min
Aug 10, 1:49 AM CDT	Severe Thunderstorm Warning	LCH	Allen, Evangeline, Rapides	56 min
Aug 10, 2:39 AM CDT	Special Weather Statement	LCH	Acadia, Allen, Evangeline	66 min
Aug 10, 5:49 AM CDT	Severe Thunderstorm Warning	LCH	Avoyelles, Rapides	56 min
Aug 10, 6:29 AM CDT	Severe Thunderstorm Warning	LCH	Avoyelles	37 min
Aug 10, 1:42 PM CDT	Special Marine Warning	LCH		63 min
Aug 10, 5:18 PM CDT	Special Weather Statement	LCH	Beauregard	57 min
Aug 10, 5:46 PM CDT	Special Weather Statement	LCH	Allen	59 min
Aug 10, 6:43 PM CDT	Special Weather Statement	LCH	Allen, Rapides	62 min
Aug 10, 6:50 PM CDT	Severe Thunderstorm Warning	LCH	Calcasieu	40 min
Aug 10, 3:51 PM CDT	Special Weather Statement	LCH	Jasper, Tyler	54 min
Aug 10, 4:15 PM CDT	Severe Thunderstorm Warning	LCH	Jasper, Tyler	37 min
Aug 10, 4:48 PM CDT	Special Weather Statement	LCH	Hardin, Jasper, Tyler	72 min
Aug 10, 6:01 PM CDT	Special Weather Statement	LCH	Orange	59 min
Aug 10, 6:19 PM CDT	Severe Thunderstorm Warning	LCH	Jasper, Newton, Orange	41 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.