000
AXPZ20 KNHC 200312
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC MON AUG 20 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 AXIS FROM 08N82W TO 08N87W TO 14N99W TO 12N110W 
TO 07N117W TO LOW PRES 1010 MB AT 13N127W THEN ITCZ TO 10N134W 
TO BEYOND 10N140W.  SCATTERED MODERATE CONVECTION WITHIN 120 NM 
S OF AXIS FROM 97W TO 118W. 

...DISCUSSION...
MID TO UPPER LEVEL ANTICYCLONE OVER N BAJA CALIFORNIA BRINGS 
MOISTURE LADEN AIR MASS OVER E PAC N OF MONSOON TROUGH E OF 
115W.  MID TO UPPER LEVEL TROUGH ALONG BAJA CALIFORNIA PENINSULA 
PROVIDES UPPER LEVEL DIVERGENT FLOW TO PROMPT SCATTERED MODERATE 
TO STRONG CONVECTION OVER GULF OF CALIFORNIA N OF 23N.  AIR MASS 
REMAINS VERY DRY N OF 12N W OF 116W AND W OF 121W S OF 12N. 

AT THE LOWER LEVELS...HIGH PRES CENTER 1020 MB AT 30N136W BLOCKS 
LOW PRES CENTER 1009 MB...LINGERING REMNANTS OF HECTOR...FROM 
DRIFTING ANY FARTHER W WITH LOW PRES EXPECTED TO DISSIPATE 
TONIGHT.  NO SIGNIFICANT WEATHER ASSOCIATED WITH EITHER FEATURE.

SECOND LOW PRES CENTER 1010 MB AT 19N106W WITH AN ASSOCIATED 
WEAK TROUGH FROM 18N105W TO 21N109W PROMPT ISOLATED CONVECTION 
NEAR MEXICO COAST BUT NOT EXPECTED LAST OVERNIGHT.  MODEL 
GUIDANCE SOLUTIONS DISSIPATE BOTH LOW PRESSURES BY LATE TONIGHT
ALTHOUGH MAINTAINS REGION PRESSURE LOWER THAN NORMAL. 

STRONG WINDS OVER SOUTHERN PACIFIC BRING CROSS EQUATORIAL SWELL 
TO 9 FT SPREADING N INTO E PAC REACHING 05N W OF 110W BY TUE.  

$$
WALLY BARNES