000
AXPZ20 KNHC 222120
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS NATIONAL HURRICANE CENTER MIAMI FL                        
2205 UTC FRI MAR 22 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 1800 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
2100 UTC.

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

MONSOON TROUGH AXIS EXTENDS FROM 08N82W TO 01N97W. ITCZ AXIS 
EXTENDS FROM 01N97W TO 03N110W TO 02N140W. SCATTERED MODERATE 
ISOLATED STRONG FROM 04N TO 08N BETWEEN 83W AND 86W. SCATTERED 
MODERATE FROM 05N TO 07N BETWEEN 123W AND 126W.

...DISCUSSION... 

STRONG HIGH PRESSURE 1035 MB IS CENTERED WELL N OF THE AREA NEAR 
41N133W WITH RIDGE EXTENDING SE TO NEAR 20N115W. WITH THE 
DISTANCE OF THE HIGH PRESSURE CENTER FROM THE AREA...A WEAK 
PRESSURE GRADIENT PREVAILS OVER THE MAJORITY OF THE FORECAST 
AREA. AS A RESULT...WINDS ACROSS THE FORECAST WATERS ARE BELOW 
ADVISORY CRITERIA...EXCEPT N OF 28N BETWEEN 120W AND 130W WHERE 
N TO NE WINDS OF 20-25 KT ARE STILL BLOWING. ALTHOUGH THE HIGH 
PRESSURE CENTER WILL SHIFT SOUTHWARD OVER THE NEXT COUPLE OF 
DAYS...IT WILL CONTINUE TO WEAKEN. THIS WILL MAINTAIN A WEAK 
PRES GRADIENT ACROSS THE REGION WITH WINDS OF 20 KT OR LESS.  
 
NORTHERLY SWELLS ARE COVERING THE FAR N PART OF THE FORECAST 
AREA WITH COMBINED SEAS TO 11 FT FOUND IN THE AREA OF FRESH TO 
STRONG WINDS. A NEW SET OF LONG-PERIOD NW SWELLS IS REACHING  
THE FAR NW WATERS...WITH COMBINED SEAS AROUND 8 FT. THIS SWELL 
EVENT WILL ALSO OVERLAP WITH THE AREA OF N-NW SWELL OVER THE N 
WATERS OVERNIGHT. IN ADDITION...CROSS EQUATORIAL SW SWELLS WITH 
PERIODS IN THE RANGE OF 18-20 SECONDS ARE ALREADY IMPACTING THE 
COAST OF MUCH OF CENTRAL AMERICA AND MAINLAND MEXICO AND WILL 
REACH THE COAST OF BAJA CALIFORNIA TONIGHT. 

$$
GR