000
AXPZ20 KNHC 072116
TWDEP 

TROPICAL WEATHER DISCUSSION                                      
NWS NATIONAL HURRICANE CENTER MIAMI FL                           
2205 UTC TUE MAY 07 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...   
THE MONSOON TROUGH AXIS EXTENDS FROM 05N77W TO 08N86W TO 10N101W 
TO 09N118W WHERE LOW LEVEL WINDS SUGGEST A TRANSITION TO ITCZ 
EXTENDING TO 10N129W TO BEYOND 06N140W. SCATTERED MODERATE 
CONVECTION WAS NOTED WITHIN 180 NM S OF AXIS BETWEEN 90W AND 
100W. SCATTERED MODERATE CONVECTION WAS NOTED WITHIN 90 NM 
EITHER SIDE OF AXIS BETWEEN 119W AND 125W. 

...DISCUSSION...  
WEAK STATIONARY HIGH PRESSURE IS CENTERED NEAR 25N119W WITH WEAK 
SURFACE RIDGE EXTENDING WSW TO BEYOND 18N140W. THE PRESSURE 
GRADIENT REMAINS WEAK OVER THE MAJORITY OF THE FORECAST AREA. 
THIS IS CREATING RELATIVELY TRANQUIL MARINE CONDITIONS ACROSS 
THE FORECAST AREA...WITH GENTLE WINDS PREVAILING ACROSS MOST OF 
THE AREA AS DEPICTED BY THE LATEST SCATTEROMETER PASS. THE 
SURFACE RIDGE IS CLOSEST TO THE LOWER PRESSURE ASSOCIATED WITH 
THE ITCZ W OF 130W. AS A RESULT...THE PRESSURE GRADIENT IS 
SLIGHTLY TIGHTER IN THIS AREA...AND MODERATE TO FRESH WINDS ARE 
PREVAILING. WITH WINDS 20 KT OR LESS AND NO SIGNIFICANT SWELLS 
OVER THE AREA...SEAS REMAIN BELOW 8 FT. 
 
THE SURFACE RIDGE WILL STRENGTHEN SLIGHTLY OVER THE NEXT COUPLE 
OF DAYS. THIS WILL EXPAND THE AREA OF FRESH TRADEWINDS N OF THE 
ITCZ OVER THE WESTERN PART OF THE AREA. A COLD FRONT WILL 
APPROACH THE NW WATERS BY THU...WITH SOUTHERLY FLOW AHEAD OF THE 
FRONT INCREASING TO A FRESH BREEZE OVER THIS AREA. 
  
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AL