000
AXPZ20 KNHC 150400
TWDEP 

TROPICAL WEATHER DISCUSSION                                  
NWS NATIONAL HURRICANE CENTER MIAMI FL                      
0405 UTC TUE DEC 15 2015

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 0000 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH
0330 UTC.               
 
...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...            

WEAK TROUGH EXTENDS FROM 10N87W TO 07N101W...THEN CONTINUES FROM
12N110W TO 10N120W. ITCZ EXTENDS FROM 10N120W TO 07N130W TO
04N140W. SCATTERED MODERATE ISOLATED STRONG FROM 03N TO 08N
BETWEEN 80W AND 88W. SCATTERED MODERATE ISOLATED STRONG FROM 05N
TO 10N BETWEEN 101W AND 105W. SCATTERED MODERATE WITHIN 120 NM N
OF ITCZ BETWEEN 121W AND 125W.

...DISCUSSION...

A COLD FRONT EXTENDS ACROSS THE NORTHERN WATERS FROM 26N113W TO
22N128W TO 26N140W. STRONG HIGH PRESSURE OF 1037 MB IS CENTERED
N OF THE AREA NEAR 38N139W. A RECENT RAPIDSCAT PASS FROM 2233
UTC SHOWED TWO DISTINCT AREAS OF STRONG WINDS ASSOCIATED WITH
THIS FRONT...AN AREA OF 30 KT WINDS CLOSE TO 30N125W ON THE
EASTERN EDGE OF THE PASS AND ANOTHER AREA OF NE WINDS OF 25-30
KT WITHIN 180 NM N OF THE FRONT BETWEEN 130W AND 135W. THIS SAME
SCATTEROMETER PASS INDICATED THAT THE AREA OF FRESH TO STRONG
NORTHERLY WINDS WERE MERGING INTO AN EXISTING AREA OF ENHANCED
NE TRADES FROM 09N TO 23N W OF 135W AND FROM 11N TO 23N BETWEEN
122W AND 135W. THESE TRADE WINDS WERE A RESULT OF THE PRESSURE
GRADIENT BETWEEN THE AREA OF HIGH PRESSURE N OF THE AREA AND
LOWER PRESSURE IN THE VICINITY OF THE ITCZ. THESE TRADES
GENERATED A LARGE AREA OF SEAS 9 TO 12 FT IN A MIX OF NW AND NE
SWELL. THE LARGE AREA OF FRESH TO STRONG WINDS WILL CONTINUE
OVER THE WESTERN WATERS AS STRONG HIGH PRESSURE CONTINUES TO
PREVAIL N OF THE AREA. THE COLD FRONT WILL CONTINUE TO PUSH
SOUTHWARD OVER THE WATERS WHILE SLOWLY WEAKENING. THE FRONT IS
EXPECTED TO DISSIPATE WITHIN 24 TO 36 HOURS. 
 
LARGE NW SWELL FROM THE PREVIOUS COLD FRONT IS SUBSIDING OVER
THE FORECAST AREA N OF THE EQUATOR. THE LEADING EDGE OF THIS
SWELL...WITH PERIODS IN THE 19-21 SECOND RANGE AND 5-8 FT SEAS
HAS PASSED THE GALAPAGOS ISLANDS AND IS CROSSING INTO THE
SOUTHERN HEMISPHERE WHERE THE PEAK SWELL PERIOD IS ALONG 10S.

A LARGE DEEP EXTRATROPICAL CYCLONE OVER THE BERING SEA IS
EXPECTED TO GENERATE  ANOTHER ROUND OF LONG PERIOD SWELLS OF
OVER 20 SECONDS. THESE SWELLS WILL MOVE INTO THE FORECAST AREA
EARLY TUE AND SPREAD SE TUE NIGHT AND WED...EXTENDING FROM NW
BAJA CALIFORNIA TO 18N130W BY WED EVENING. MARINE INTERESTS
ALONG THE BAJA CALIFORNIA COAST AND NEARBY ISLANDS SHOULD BE
ALERT TO POTENTIALLY DANGEROUS BREAKING SURF ON WED.   

GULF OF CALIFORNIA...THE COLD FRONT ENTERING THE NORTHERN GULF
OF CALIFORNIA  HAS INCREASED WINDS TO 30 KT N OF 30N PER A 2100
UTC RAPIDSCAT PASS. THE FRONT WILL BEGIN TO WEAKEN OVER THE
NORTHERN GULF OVERNIGHT...WITH ASSOCIATED WINDS EXPECTED TO
DIMINISH THROUGH TUE AS THE FRONT MOVES INTO EXTREME S PORTION
OF THE GULF. 

$$
COBB