000
AXPZ20 KNHC 221504
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS NATIONAL HURRICANE CENTER MIAMI FL                        
1605 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 1200 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
1500 UTC.

...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...   
THE MONSOON TROUGH AXIS EXTENDS FROM 08N82W TO 03N91W. THE ITCZ 
AXIS EXTENDS FROM 03N104W TO 01N140W. SCATTERED MODERATE 
ISOLATED STRONG CONVECTION WAS NOTED WITHIN 90 NM OF TROUGH AXIS 
BETWEEN 82W AND 87W.

...DISCUSSION... 
1032 MB HIGH PRESSURE IS CENTERED WELL N OF THE AREA NEAR 
43N133W WITH RIDGE EXTENDING SE TO NEAR 22N115W. WITH THE 
DISTANCE OF THE HIGH PRESSURE CENTER FROM THE AREA...A WEAK 
PRESSURE GRADIENT PREVAILS OVER THE FORECAST AREA. AS A 
RESULT...WINDS ACROSS THE FORECAST AREA ARE BELOW ADVISORY 
CRITERIA. ALTHOUGH THE HIGH PRESSURE CENTER WILL SHIFT SOUTHWARD 
OVER THE NEXT COUPLE OF DAYS...IT WILL CONTINUE TO WEAKEN. THIS 
WILL MAINTAIN A WEAK GRADIENT ACROSS THE AREA WITH WINDS 
REMAINING BELOW ADVISORY CRITERIA THROUGH THE FORECAST PERIOD.  
 
NORTHERLY SWELLS ARE COVERING THE FAR N PART OF THE FORECAST 
AREA WITH COMBINED SEAS TO 9 FT FOUND N OF 28N AND W OF 120W. A 
NEW SET OF LONG-PERIOD NW SWELLS WILL REACH THE FAR NW WATERS 
LATER TONIGHT...WITH COMBINED SEAS AROUND 8 FT MOVING INTO THE 
AREA. 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 15-18 SECONDS 
WILL IMPACT THE COAST OF MUCH OF CENTRAL AMERICA AND MAINLAND 
MEXICO TODAY THROUGH EARLY SUN BEFORE SUBSIDING.

$$
AL