000
AXPZ20 KNHC 201506
TWDEP 

TROPICAL WEATHER DISCUSSION                                   
NWS NATIONAL HURRICANE CENTER MIAMI FL                        
1605 UTC WED MAR 20 2013

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 AXIS EXTENDS FROM 07N78W TO 03N100W WHERE LOW 
LEVEL WINDS SUGGEST A TRANSITION TO ITCZ WHICH EXTENDS TO BEYOND 
01N140W. SCATTERED MODERATE TO STRONG CONVECTION WAS NOTED 
WITHIN 90 NM N AND 60 NM S OF AXIS BETWEEN 88W AND 91W. 
SCATTERED MODERATE ISOLATED STRONG CONVECTION WAS NOTED WITHIN 
90 NM OF AXIS BETWEEN 115W AND 126W. SCATTERED MODERATE 
CONVECTION WAS NOTED WITHIN 90 NM N OF AXIS W OF 135W.

...DISCUSSION... 
DISSIPATING HIGH PRESSURE 1020 MB IS CENTERED NEAR 30N124W WITH 
A DISSIPATING STATIONARY FRONT OVER THE FAR NW PART OF THE 
FORECAST AREA EXTENDING FROM 30N136W TO 26N140W. WITH WEAK HIGH 
PRESSURE OVER THE FORECAST AREA...THE PRESSURE GRADIENT IS WEAK 
AND WINDS ARE CURRENTLY 20 KT OR LESS ACROSS THE FORECAST AREA. 
THE COLD FRONT WILL DISSIPATE BY THIS EVENING.  
 
AN AREA OF FRESH WINDS IS SUPPORTING SEAS TO 8 FT FROM 04N TO 
10N BETWEEN 116W AND 130W. THE AREA OF FRESH WINDS WILL DIMINISH 
LATER TODAY AS THE SUBTROPICAL HIGH REORGANIZES WELL TO THE NW 
OF ITS CURRENT POSITION. HOWEVER...THE LEADING EDGE OF A NEW 
CROSS-EQUATORIAL SW SWELL TRAIN WITH PERIODS IN EXCESS OF 20 
SECONDS WILL HELP KEEP SEAS TO 8 FT.

THE PRESSURE GRADIENT WILL INCREASE OVERNIGHT THU NIGHT OFF THE 
COAST OF SOUTHERN CALIFORNIA AND BAJA CALIFORNIA NORTE IN 
RESPONSE TO THE REORGANIZING SUBTROPICAL HIGH AND INCREASED 
TROUGHING OVER THE INTERMOUNTAIN WESTERN U.S. THIS WILL BRING A 
FRESH TO STRONG N-NW BREEZE TO NE FORECAST WATERS OFF BAJA 
CALIFORNIA NORTE...WITH SEAS BUILDING TO 9 FT BY EARLY FRI 
MORNING. 

$$
AL