000
AXPZ20 KNHC 240342
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
2205 UTC WED APR 23 2008

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

BASED ON 1800 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
2130 UTC.

...ITCZ...
ITCZ AXIS ALONG  06N77W  03N110W  04N128W  02N135W  02N140W.  
SCATTERED MODERATE ISOLATED STRONG CONVECTION WITHIN 120 NM OF 
AXIS FROM 87W TO 117W.

...DISCUSSION...
UPPER LEVEL TROUGH LAYING DOWN E-W ALONG 29N AS PREDICTED BY 
GLOBAL MODELS AND WINDS GONE ZONAL N OF 15N W OF 110W.  FAIRLY 
DRY WITHIN 240 NM OF TROUGH AXIS WHILE 85 KT JET CORE ADVECTS 
PLENTY OF TRPCL MOISTURE INTO SRN BAJA CALIFORNIA AND CENTRAL 
MEXICO.  COMPLEX DOUBLE-CENTERED RIDGE...WITH FOCI AT 05N132W 
AND 09N117W...EXTEND NE TO 20N101W EXPANDING DRY AIR MASS UNDER 
ITS UMBRELLA.  SMALL AREA OF DIFFLUENT AIR FLOW IN DEFORMATION 
ZONE BETWEEN RIDGE FOCI SUPPORTING MINOR CONVECTION 04N126W.  

ELSEWHERE...UPPER LEVEL RIDGE WITH CENTER WELL E OF CARIBBEAN 
SEA EXTEND WELL INTO E PAC TO 110W.  SMALL NARROW TROUGH TRAPPED 
BETWEEN RIDGES CAUSING DIFFLUENT FLOW ALOFT ENHANCING AREA OF 
CONVECTION ALONG ITCZ FROM 100W-110W.

AT THE SURFACE...HIGH PRES 1025 MB AT 28N132W HAS RIDGE EXTEND 
TO 11N115W.  MODERATE/STRONG TRADE WINDS FROM 8N-23N W OF 120W
LIKELY TO REMAIN UNDAUNTED AS HIGH PRES HOLDS ITS FOOTING IN 
PLACE OR DRIFT NE.  SIMILARLY WINDS ALONG BAJA CALIFORNIA COAST 
EXPECTED TO REMAIN WITH LITTLE CHANGE. 

$$
WALLY BARNES