000
AXPZ20 KNHC 101602
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC THU JAN 10 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...3N77W 5N85W 4N96W 6N110W 6N127W 
4N140W.  ISOLATED MODERATE CONVECTION WITHIN 75 NM OF AXIS FROM 
115W TO 119W.

...DISCUSSION...
UPPER LEVEL TROUGH EXTEND SW FROM 32N102W ACROSS SRN BAJA 
CALIFORNIA TO UPPER LEVEL CYCLONIC VORTEX AT 14N131W.  VERY DRY 
AIR MASS AT MID/UPPER LEVEL N OF ITCZ TO 25N W OF 127W.  TILTED 
UPSTREAM UPPER LEVEL RIDGE CREST ENCROACHING INTO E PAC BASIN NW 
OF TROUGH BRINGS MINOR AMOUNT OF MOISTURE.  

DOWNSTREAM BROAD MID/UPPER LEVEL RIDGE EXTEND FROM SOUTH AMERICA 
ACROSS NICARAGUA AND HONDURAS TO YUCATAN PENINSULA MAINTAINS 
STRONG TO MODERATE SUBSIDENCE ALOFT.  DRY AIR MASS E OF 105W 
CURTAILS ANY SIGNIFICANT DEEP CONVECTION ALONG ITCZ.

AT THE SURFACE...
HIGH PRES CENTER 1027 MB AT 27N137W HAS RIDGE EXTEND SE TO 
14N108W.  ANTICYCLONIC FLOW N OF 10N W OF 105W MAINTAINS BRISK 
NE TRADES W OF 120W.  LARGE LONG PERIOD SWELL TRAINS CONTINUE 
SPREADING S ACROSS E PAC TO THE EQUATOR W OF 110W.     

WALLY BARNES