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Eastern Pacific Tropical Weather Discussion



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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Page last modified: Wednesday, 17-Dec-2014 15:03:03 UTC