Small Craft Advisory 20, NWS Lake Charles, LA

180 
WHUS74 KLCH 260831
MWWLCH

URGENT - MARINE WEATHER MESSAGE
NATIONAL WEATHER SERVICE LAKE CHARLES LA
331 AM CDT WED APR 26 2017

...A SMALL CRAFT ADVISORY IS IN EFFECT...

.AN AREA OF LOW PRESSURE AND AN ASSOCIATED COLD FRONT WILL MOVE
THROUGH THE AREA TODAY RESULTING IN STRONG AND GUSTY WINDS WHICH
WILL LEAD TO ELEVATED SEAS.

GMZ470-472-475-261645-
/O.EXT.KLCH.SC.Y.0020.000000T0000Z-170427T0600Z/
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-
331 AM CDT WED APR 26 2017

...SMALL CRAFT ADVISORY NOW IN EFFECT UNTIL 1 AM CDT THURSDAY...

* WINDS...SOUTH AT 15 TO 20 KNOTS WITH GUSTS TO 30 KNOTS.

* WAVES/SEAS...5 TO 7 FEET.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SMALL CRAFT ADVISORY MEANS THAT WIND SPEEDS OF 21 TO 33 KNOTS
ARE EXPECTED TO PRODUCE HAZARDOUS WAVE CONDITIONS TO SMALL CRAFT.
INEXPERIENCED MARINERS...ESPECIALLY THOSE OPERATING SMALLER
VESSELS SHOULD AVOID NAVIGATING IN THESE CONDITIONS.

&&

$$

GMZ450-452-455-261645-
/O.EXT.KLCH.SC.Y.0020.170426T1200Z-170426T1800Z/
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-
331 AM CDT WED APR 26 2017

...SMALL CRAFT ADVISORY NOW IN EFFECT FROM 7 AM THIS MORNING TO
1 PM CDT THIS AFTERNOON...

* WINDS...SOUTH AT 15 TO 20 KNOTS WITH GUSTS TO 30 KNOTS.
  

* WAVES/SEAS...SEAS BUILDING TO 4 TO 6 FEET.

 PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SMALL CRAFT ADVISORY MEANS THAT WIND SPEEDS OF 21 TO 33 KNOTS
ARE EXPECTED TO PRODUCE HAZARDOUS WAVE CONDITIONS TO SMALL CRAFT.
INEXPERIENCED MARINERS...ESPECIALLY THOSE OPERATING SMALLER
VESSELS SHOULD AVOID NAVIGATING IN THESE CONDITIONS.

&&

$$

501 
WHUS74 KLCH 261526
MWWLCH

URGENT - MARINE WEATHER MESSAGE
NATIONAL WEATHER SERVICE LAKE CHARLES LA
1026 AM CDT WED APR 26 2017

...SMALL CRAFT ADVISORIES IN EFFECT...

.AN AREA OF LOW PRESSURE AND AN ASSOCIATED COLD FRONT WILL MOVE
THROUGH THE AREA TODAY, RESULTING IN STRONG AND GUSTY WINDS WHICH
WILL LEAD TO ELEVATED SEAS.

GMZ430-432-435-270000-
/O.EXB.KLCH.SC.Y.0020.000000T0000Z-170427T0000Z/
SABINE LAKE-CALCASIEU LAKE-VERMILION BAY-
1026 AM CDT WED APR 26 2017

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 7 PM CDT THIS EVENING...

THE NATIONAL WEATHER SERVICE IN LAKE CHARLES HAS ISSUED A SMALL
CRAFT ADVISORY, WHICH IS IN EFFECT UNTIL 7 PM CDT THIS EVENING. 

* WINDS...SOUTH AT 15 TO 25 KNOTS WITH GUSTS UP TO 30 KNOTS.

* WAVES/SEAS...BAY AND LAKE WATERS VERY ROUGH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SMALL CRAFT ADVISORY MEANS THAT WIND SPEEDS OF 21 TO 33 KNOTS
ARE EXPECTED TO PRODUCE HAZARDOUS WAVE CONDITIONS TO SMALL CRAFT.
INEXPERIENCED MARINERS...ESPECIALLY THOSE OPERATING SMALLER
VESSELS SHOULD AVOID NAVIGATING IN THESE CONDITIONS.

&&

$$

GMZ450-452-455-270000-
/O.EXT.KLCH.SC.Y.0020.000000T0000Z-170427T0000Z/
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-
1026 AM CDT WED APR 26 2017

...SMALL CRAFT ADVISORY NOW IN EFFECT UNTIL 7 PM CDT THIS
EVENING...

* WINDS...SOUTH AT 15 TO 25 KNOTS WITH GUSTS TO 30 KNOTS.

* WAVES/SEAS...SEAS 3 TO 5 FEET.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SMALL CRAFT ADVISORY MEANS THAT WIND SPEEDS OF 21 TO 33 KNOTS
ARE EXPECTED TO PRODUCE HAZARDOUS WAVE CONDITIONS TO SMALL CRAFT.
INEXPERIENCED MARINERS...ESPECIALLY THOSE OPERATING SMALLER
VESSELS SHOULD AVOID NAVIGATING IN THESE CONDITIONS.

&&

$$

GMZ470-472-475-270000-
/O.CON.KLCH.SC.Y.0020.000000T0000Z-170427T0600Z/
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-
1026 AM CDT WED APR 26 2017

...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 1 AM CDT
THURSDAY...

* WINDS...SOUTH AT 15 TO 25 KNOTS WITH GUSTS TO 30 KNOTS.

* WAVES/SEAS...5 TO 7 FEET.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SMALL CRAFT ADVISORY MEANS THAT WIND SPEEDS OF 21 TO 33 KNOTS
ARE EXPECTED TO PRODUCE HAZARDOUS WAVE CONDITIONS TO SMALL CRAFT.
INEXPERIENCED MARINERS...ESPECIALLY THOSE OPERATING SMALLER
VESSELS SHOULD AVOID NAVIGATING IN THESE CONDITIONS.

&&

$$

13

453 
WHUS74 KLCH 262043
MWWLCH

URGENT - MARINE WEATHER MESSAGE
NATIONAL WEATHER SERVICE LAKE CHARLES LA
343 PM CDT WED APR 26 2017

...SMALL CRAFT ADVISORY IN EFFECT BEYOND 20 NM...

.SOUTH WINDS ARE STARTING TO DECREASE OVER THE COASTAL WATERS, AND
WILL CONTINUE SUBSIDING FROM WEST TO EAST AS A COLD FRONT
APPROACHES THE AREA. THIS FRONT IS FORECAST TO PUSH THROUGH THE
REGION THIS EVENING, WITH INCREASING AND GUSTY NORTHWEST WINDS IN
ITS WAKE. WINDS WILL DIMINISH EARLY THURSDAY MORNING.

GMZ430-432-435-450-452-455-262145-
/O.CAN.KLCH.SC.Y.0020.000000T0000Z-170427T0000Z/
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-
343 PM CDT WED APR 26 2017

...SMALL CRAFT ADVISORY IS CANCELLED...

THE NATIONAL WEATHER SERVICE IN LAKE CHARLES HAS CANCELLED THE
SMALL CRAFT ADVISORY. 

SMALL CRAFT SHOULD EXERCISE CAUTION THROUGH 7 PM OVER THE COASTAL
LAKES AND BAYS, AND THROUGH THE REST OF THE NIGHT OVER THE
NEARSHORE WATERS.

$$

GMZ470-472-475-270500-
/O.EXT.KLCH.SC.Y.0020.000000T0000Z-170427T1100Z/
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-
343 PM CDT WED APR 26 2017

...SMALL CRAFT ADVISORY NOW IN EFFECT UNTIL 6 AM CDT THURSDAY...

* WINDS...SOUTH AT 15 TO 25 KNOTS BECOMING NORTHWEST 15 TO 25
  KNOTS.

* WAVES/SEAS...5 TO 7 FEET.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SMALL CRAFT ADVISORY MEANS THAT WIND SPEEDS OF 21 TO 33 KNOTS
ARE EXPECTED TO PRODUCE HAZARDOUS WAVE CONDITIONS TO SMALL CRAFT.
INEXPERIENCED MARINERS...ESPECIALLY THOSE OPERATING SMALLER
VESSELS SHOULD AVOID NAVIGATING IN THESE CONDITIONS.

&&

$$

13

Area Forecast Discussion
National Weather Service Lake Charles LA
315 PM CDT Tue Apr 25 2017

.DISCUSSION...Stratocu at 3-4K ft has advanced across the forecast
area on a warm, moistening and deepening low level southerly flow.
Very mild temperatures in place generally ranging from the upper
70s to lower 80s. Surface dewpoints are running near 20 degrees
above that of yesterday at this time. A tightening pressure
gradient is yielding rather breezy conditons with a similar
strength expected to be maintained through the night. Should see
slightly stronger winds for Wednesday and a wind advisory may be
required. Otherwise mild temperatures will be on tap, and a chance
for a few pre-frontal thunderstorms developing as moisture and
lift increases and existing subsidence inversion dissipates.

Cold front continues to be similarly progged by the models to
rapidly advance across the forecast area mainly during the evening
hours Wednesday. Rain chances will remain highest with associated
low level convergence incoming along boundary with highest chances
over the northern portion of the forecast area. With moderate to
high instability in place and more than adequate shear, could see
any convective development rapidly ramp up to severe. SPC is
maintaining a slight risk for severe over much of the northern
half of the area, and a marginal risk further south. All risks
will be in place including damaging hail and winds, as well as
isolated tornadoes.

Lower dewpoints and cooler temperatures will follow the frontal
passage for Thursday. Southerlies then rapidly become
reestablished for Friday and the weekend with moisture and warming
temperatures. This ahead of a vigorous storm system advancing
across the south plains and into the mid-Mississippi valley
that will send an active cold front over the forecast area
Sunday.

&&

.MARINE...A strong and long fetch of southerlies with elevated
seas will continue through Wednesday. A cold front will sweep
over the northwest gulf Wednesday night possibly accompanied by a
few thunderstorms. A brief and moderate offshore flow will follow
the frontal passage with southerlies rapidly returning Thursday
night. A more active cold front will move into the gulf waters
Sunday.

&&

.PRELIMINARY POINT TEMPS/POPS...
AEX  69  83  54  80 /  10  30  70   0
LCH  72  83  58  82 /  10  30  50   0
LFT  70  85  61  84 /  10  20  50  10
BPT  74  83  57  81 /  10  30  30   0

&&

.LCH WATCHES/WARNINGS/ADVISORIES...
LA...None.
TX...None.
GM...Small Craft Exercise Caution until 7 PM CDT this evening for
     GMZ470.

&&

PUBLIC...23

Hazardous Weather Outlook
National Weather Service Lake Charles LA
445 AM CDT Tue Apr 25 2017

LAZ027>033-041>045-052>055-073-074-TXZ180-201-215-216-259>262-
261100-
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-
445 AM CDT Tue Apr 25 2017

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
No rainfall is expected through tonight, although warmer and
increasingly muggy conditions are expected as southerly flow off
the Gulf behind departing high pressure lingers.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday
A cold front will advance across the forecast area Wednesday
night. A chance for pre-frontal showers and thunderstorms can be
expected Wednesday, with chances increasing through the overnight
hours along and just ahead of the boundary. Sufficient moisture,
instability and shear will be in place to result in the
possibility of severe thunderstorm development including damaging
winds and hail, as well as isolated tornadoes.

After dry weather for Thursday, a few showers look possible for
the daytime hours on Friday as moisture begins to increase ahead
of our next storm system. Showers and storms will increase through
the weekend, with at least a slim chance for severe weather again
Saturday night and Sunday.

.SPOTTER INFORMATION STATEMENT...
Spotter activation may be required Wednesday and Sunday.

GMZ430-432-435-450-452-455-470-472-475-261100-
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-
445 AM CDT Tue Apr 25 2017

This Hazardous Weather Outlook is for portions of Gulf of Mexico.

.DAY ONE...Today and Tonight
An elevated southerly flow is expected through tonight as low
pressure moves into the Southern Plains.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday
Winds will shift northerly behind a weak cold front crossing the
waters late Wednesday...then will become southerly once again by
late in the week.

.SPOTTER INFORMATION STATEMENT...
Spotter activation will not be needed.

25