000
AXPZ20 KNHC 190308
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC SUN AUG 19 2012

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 
0300 UTC.

...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
MONSOON TROUGH FROM 10N86W TO 13N100W TO 07N112W TO LOW PRES 
1010 MB AT 13N127W TO 10N133W THEN ITCZ TO BEYOND 09N140W.  
SCATTERED MODERATE CONVECTION FROM 06N TO TROUGH AXIS BETWEEN 
87W AND 96W...AND WITHIN 60 NM OF AXIS FROM 104W TO 111W. 

...DISCUSSION...
UPPER LEVEL ANTICYCLONE AT 31N119W BRINGS MOISTURE BACK INTO E 
PAC N OF 23N E OF 124W.  REMNANTS OF HECTOR STILL LINGERING JUST 
W OF SOUTHERN TIP OF BAJA UNABLE TO TAP INTO IT AS IT DEMISE IS 
ALL BUT CERTAIN OVER THE COLD WATERS.  SECOND ANTICYCLONE OVER 
TROPICAL DEPRESSION HELENE ADVECTS ABUNDANT MOISTURE DEBRIS FROM 
SYSTEM ACROSS SOUTHERN MEXICO INTO E PAC E OF 120W.  WEAK TROUGH 
EXTEND FROM 20N107W TO 14N120W SEPARATES ANTICYCLONES AND ALLOWS 
MODERATE DIVERGENT FLOW ALOFT TO ENHANCE SCATTERED MODERATE 
ISOLATED STRONG CONVECTION ALONG MONSOON TROUGH E OF 106W. 

AT THE LOWER LEVELS...LOW PRES CENTER 1009 MB...REMNANTS OF 
HECTOR...AT 23N116W CONTINUES TO WEAKEN AS IT DRIFT N-NE.  MOST 
OF CONVECTION AND WINDS ABOVE 20 KT ARE GONE AND LOW PRES 
EXPECTED TO DISSIPATE EARLY SUN. 

HIGH PRES CENTER 1020 MB AT 30N134W BLOCK MOVEMENT OF REMNANT 
LOW OF HECTOR...WHICH THEN DRIFTS N-NE TOWARD NORTHERN BAJA 
BEFORE DISSIPATING SUN.  HIGH PRES ALSO PROVIDE LIGHT TO 
MODERATE NE TRADES W OF 125W N OF MONSOON TROUGH.

LONG PERIOD CROSS EQUATORIAL S SWELL TO 8 FT SPREAD AS FAR N AS 
06N FROM 95W TO 130W BY LATE MON.

$$
WALLY BARNES