000
AXPZ20 KNHC 101005
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC FRI SEP 10 2010

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

BASED ON 0600 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0915 UTC.

...ITCZ...
AXIS FROM 13N114W TO 09N128W TO 10N140W.  SCATTERED MODERATE 
CONVECTION WITHIN 150 NM N AND 60 NM S OF AXIS FROM 116W-134W. 

...DISCUSSION...
SHARP UPPER LEVEL TROUGH ENTERS NW CORNER OF E PAC FROM 32N135W 
TO CYCLONE AT 16N127W TRIES TO PUSH LARGE WELL ANCHORED RIDGE 
OVER NORTHERN MEXICO WITHOUT SUCCESS.  CYCLONE LIKELY TO STAY IN 
PLACE WHILE TROUGH SHIFT MORE NE AND MOVE OUT OF BASIN SUN.  
VERY DRY AND STABLE ATMOSPHERE DUE TO MODERATE TO STRONG  
SUBSIDING AIR MASS W OF LINE FROM 32N104W TO 10N140W.  SOUTHERN 
PERIPHERY OF RIDGE ADVECTING ABUNDANT TROPICAL MOISTURE INTO E 
PAC COASTAL SECTIONS...BUT ABOVE NORMAL VERTICAL SHEAR ACROSS 
TROPICAL E PACIFIC CURTAILS SIGNIFICANT CONVECTION DEVELOPING 
ALONG SUMMERTIME MONSOONAL TROUGH.

AT THE SURFACE...HIGH PRES CENTER 1027 MB WELL NW OF BASIN HAS 
RIDGE EXTEND TO 20N120W.  WEAK SHORT-LIVED CYCLONIC CIRCULATIONS 
SPROUT OUT OF MONSOONAL TROUGH...BUT STABLE AIR MASS AND ADVERSE 
UPPER ENVIRONMENT APPEARS TO PREVENT THEIR DEVELOPMENT.

$$
WALLY BARNES