000
AXPZ20 KNHC 070331
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC TUE SEP 07 2010

TROPICAL WEATHER DISCUSSION FOR THE EASTERN PACIFIC OCEAN FROM 
THE EQUATOR TO 32N...EAST OF 140W.

BASED ON 0000 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0300 UTC.

...ITCZ...
AXIS FROM FROM AXIS 13N110W TO 09N127W TO 13N137 TO 12N140W.  
ISOLATED MODERATE CONVECTION WITHIN 30 NM OF AXIS FROM 110W-116W.

...DISCUSSION...
BROAD UPPER LEVEL ANTICYCLONE AT 22N127W WITH RIDGE EXTENDING SW 
MAINTAINS DRY STABLE AIR MASS N OF 15N W OF 113W WITH HELP FROM 
SMALL CYCLONE OVER CENTRAL BAJA CALIFORNIA.  WEAK ANTICYCLONE 
OVER CENTRAL MEXICO ENHANCES OUTFLOW FROM TROPICAL STORM HERMINE 
NOW MOVING INLAND FROM BAY OF CAMPECHE.  LARGE WELL ANCHORED 
ANTICYCLONE OVER GULF OF MEXICO ADVECTS ABUNDANT TROPICAL 
MOISTURE INTO DEEP TROPICAS IN E PAC.  FORTUNATELY...VERY LITTLE 
MECHANICAL UPLIFT TO CAUSE SIGNIFICANT DEEP CONVECTION.  ITCZ 
FAIRLY QUIET AND MONSOONAL TROUGH CARRIES ONLY ISOLATED MODERATE 
CONVECTION. 

AT THE SURFACE...
BROAD RIDGE EXTENDS SE FROM STRONG HIGH PRES 1032 MB WELL N OF 
BASIN. TIGHT PRES GRADIENT FORCING GALE WINDS N OF 30N ALONG 
CALIFORNIA COAST...BUT MODERATE TO FRESH BREEZE SEEP N OF 27N W 
OF 120W AND MODERATE N SWELLS. 

MONSOONAL SW TO W FLOW IN MIDST OF BASIN WEAKENING AND EXPECTED 
TO REACH BELOW 20 KT LATE IN FORECAST PERIOD.

WEAK LOW PRES W OF AREA DRIFT FURTHER AWAY AND DIMINISH WINDS E 
OF 140W WITHIN 12 HRS.  

$$
WALLY BARNES