000
AXPZ20 KNHC 091525
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC WED JAN 09 2008

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

BASED ON 1200 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
1500 UTC.
 
...ITCZ...
INTERTROPICAL CONVERGENCE ZONE...4N77W 8N85W 5N95W 7N110W 
6N140W.  NO SIGNIFICANT CONVECTION.

...DISCUSSION...
LARGE AMPLITUDE UPPER LEVEL TROUGH EXTENDS NRN TIP OF BAJA 
CALIFORNIA TO CYCLONIC VORTEX AT 16N128W THEN TO 13N140W.  VERY 
DRY AIR MASS WITHIN 90 NM OF TROUGH AXIS.  HIGH LEVEL MOISTURE 
ENTERS E PAC N OF 25N ON CREST OF UPSTREAM RIDGE APPROACHING 
140W.  SWATH WITH PLENTY OF TRPCL MOISTURE ADVECTS NE FROM THE 
ONLY CONVECTION SPOT IN ITCZ...FROM 119W-125W...NE INTO SRN TIP 
OF BAJA CALIFORNIA AND CENTRAL MEXICO ON WEAK 85 KT JTST.  

UPPER LEVEL RIDGE WITH AXIS FROM SOUTH AMERICA ACROSS CENTRAL 
AMERICA UNTO YUCATAN PENINSULA DOWNSTREAM FROM UPPER LEVEL 
TROUGH MAINTAINS DRYNESS OVER E PAC E OF 107W.  

AT THE SURFACE...
HIGH PRES 1027 MB NEAR 27N139W KEEPS STEADY ANTICYCLONIC FLOW N 
OF 10N W OF 113W WITH 20-25 KT TRADES W OF 120W.  LARGE NW 
SWELLS SPREADING S COVER REMAINDER E PAC W OF 105W.  

WALLY BARNES