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000
AXPZ20 KNHC 171502
TWDEP

TROPICAL WEATHER DISCUSSION
NWS NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC WED DEC 17 2014

TROPICAL WEATHER DISCUSSION FOR THE EASTERN PACIFIC OCEAN FROM THE EQUATOR TO 32N...EAST OF 140W. THE FOLLOWING INFORMATION IS BASED ON SATELLITE IMAGERY...WEATHER OBSERVATIONS...RADAR...AND METEOROLOGICAL ANALYSIS.

BASED ON 1200 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 1500 UTC.


...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...

THE MONSOON TROUGH EXTENDS FROM 08N82W TO 06.5N91W WHERE LOW LEVEL WINDS SUGGEST A TRANSITION TO ITCZ WHICH EXTENDS TO BEYOND 05N140W. NO SIGNIFICANT CONVECTION WAS OBSERVED.


...DISCUSSION...

HIGH PRESSURE OF 1026 MB CENTERED W OF THE AREA NEAR 29N151W EXTENDS RIDGE ESE TO NEAR 25N120W. THE PRESSURE GRADIENT BETWEEN THE RIDGE AND LOWER PRESSURE IN THE VICINITY OF THE ITCZ IS MAINTAINING FRESH TO STRONG WINDS N OF THE ITCZ...FROM 10N TO 15N W OF 130W. SUCCESSIVE GROUPS OF LONG PERIOD NW SWELL OUT OF THE N CENTRAL PACIFIC ARE MAINTAINING SEAS TO 9 FT OVER MUCH OF THE REGION W OF 110W. THE RIDGE WILL CONTINUE TO BUILD OVER THE NEXT COUPLE OF DAYS AND THE AREA OF FRESH TO STRONG TRADES WILL EXPAND AND COVER FROM FROM 09N TO 20N W OF 129W BY FRI MORNING. THE NW SWELL WILL SLOWLY SUBSIDE AND COVERAGE OF SEAS 8 FT OR GREATER WILL DECREASE BY FRI MORNING. A NEW SET OF NW SWELLS WILL ENTER THE NW WATERS LATE THU...WITH SEAS REACHING NEAR 13 FT EARLY FRI MORNING.

GULF OF TEHUANTEPEC...STRING TO NEAR GALE WINDS WITH SEAS TO 8 FT CONTINUE OVER THE GULF OF TEHUANTEPEC THIS MORNING. THE HIGH PRES N OF THE AREA SUPPORTING THE TIGHT PRESSURE GRADIENT WILL SHIFT EASTWARD TODAY ALLOWING THE GRADIENT TO RELAX...WITH WINDS RAPIDLY DIMINISHING TO 20 KT OR LESS AND SEAS SUBSIDING BELOW 8 FT THIS AFTERNOON.

GULF OF PAPAGAYO...NOCTURNAL PULSES OF NE WINDS OF 15-20 KT ARE EXPECTED THROUGH FRI MORNING.

$$ AL

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