000
AXPZ20 KNHC 132206
TWDEP 

TROPICAL WEATHER DISCUSSION                                    
NWS NATIONAL HURRICANE CENTER MIAMI FL                         
2205 UTC SAT DEC 13 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 1800 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
2100 UTC.  
      
...SPECIAL FEATURES...

GULF OF TEHUANTEPEC GALE WARNING...A LOCALLY TIGHT PRESSURE 
GRADIENT ACROSS THE ISTHMUS OF TEHUANTEPEC COMBINED WITH 
OVERNIGHT DRAINAGE FLOW IS ENOUGH TO SUPPORT MINIMAL GALE FORCE 
NORTHERLY WINDS IN THE GULF OF TEHUANTEPEC WITH ASSOCIATED SEAS 
UP TO 11 FT. THESE WINDS WILL DIMINISH BELOW GALE FORCE IN THE 
NEXT FEW HOURS...THEN TO 20 KT OR LESS SUN MORNING AS THE 
GRADIENT CONTINUES TO RELAX.
 
...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
           
MONSOON TROUGH EXTENDS FROM 08N84W TO 05N94W. ITCZ EXTENDS FROM 
05N94W TO 08N108W THEN RESUMES FROM 08N110W TO 06N120W TO 
07N140W. SCATTERED MODERATE CONVECTION IS FROM 04N TO 08N E OF 
86W.

...DISCUSSION...

A 1025 MB HIGH IS CENTERED OFF THE COAST OF S CALIFORNIA NEAR 
31N26W.  A COLD FRONT REACHES FROM THE NORTHERN GULF OF 
CALIFORNIA AT 30N112W TO CENTRAL BAJA CALIFORNIA PENINSULA AT 
27N114W TO 22N122W THEN STATIONARY TO 20N132W. OVERNIGHT 
SCATTEROMETER PASSES INDICATED LIGHT TO MODERATE WINDS OVER THE 
AREA N OF 15N AS THE FRONT WEAKENS AND THE HIGH PRES BUILDS INTO 
THE AREA. ALTIMETER SATELLITE DATA INDICATE SEAS UP TO 12 TO 13 
FT W OF THE FRONT...WITH 8 TO 12 FT SEAS ENCOMPASSING THE 
REMAINDER OF THE AREA W OF 100W.

THE FRONT WILL WEAKEN THROUGH THE DAY WITH THE PORTION OVER OUR 
WATERS DISSIPATING BY SUN MORNING WHILE A NEW COLD FRONT 
CURRENTLY OVER THE N CENTRAL PACIFIC APPROACHES TONIGHT. A SMALL 
PATCH OF FRESH TO STRONG SW WINDS WILL PRECEDE THE NEW FRONT IN 
THE FAR NW CORNER TONIGHT. A REINFORCING SET OF NW SWELL WILL 
ARRIVE BEHIND THIS NEW FRONT WITH SEAS BUILDING UP TO 19 FT NEAR 
30N140W LATE SUN MORNING.

A WEAK TROUGH OR PERTURBATIONS IS EMBEDDED IN THE ITCZ ALONG 
109W. MODERATE TO LOCALLY FRESH TRADE WINDS ARE NOTED SOUTH OF 
THE RIDGE W OF 110W.

GULF OF CALIFORNIA...WINDS HAVE DIMINISHED AHEAD OF THE COLD 
FRONT WHICH CONTINUES TO DROP SE-S ACROSS THE NORTHERN GULF WITH 
ONLY MODERATE NW-N WINDS BEHIND THE FRONT. SEAS OF 2-4 FT BEHIND 
THE FRONT WILL SUBSIDE TO 2 FT OR LESS BY TONIGHT.

GULF OF PAPAGAYO...FRESH TO STRONG NE GAP WINDS HAVE DIMINISHED 
AND WILL LIKELY ONLY PULSE TO FRESH LEVELS LATE TONIGHT INTO 
EARLY SUN. 

$$
FORMOSA