000
AXPZ20 KNHC 230333
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC WED APR 23 2008

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...
ITCZ AXIS ALONG 06N77W 04N102W 08N123W 06N140W.  SCATTERED 
MODERATE/ISOLATED STRONG CONVECTION WITHIN 120 NM OF AXIS FROM 
82W-99W.  ISOLATED MODERATE CONVECTION WITHIN 60 NM OF AXIS FROM 
103W-110W.

...DISCUSSION...
DEEP-LAYERED CYCLONIC VORTEX WELL N OF AREA HAS STRONG UPPER 
LEVEL TROUGH EXTEND FROM 32N124W TO 21N140W.  MODERATE TO STRONG 
SUBSIDENCE MAINTAINS AREA NW OF AXIS FAIRLY DRY.  ANTICYCLONE 
GYRE ALOFT AT 08N121W HAS BROAD RIDGE COVERING REMAINING AREA
W OF 108W.  ABUNDANT UPPER MOISTURE TRAPPED BETWEEN RIDGE AND 
TROUGH AXIS ADVECTING NE RIDING IN 90 KT JET CORE.  

SECOND ANTICYCLONE GYRE AT 08N102W HAS RIDGE ALOFT COVERING 
REMAINING E PAC BASIN E OF 104W.  NARROW TROUGH TRAPPED BETWEEN 
GYRES ALONG 106W S OF 20N.  AIR MASS REMAINS DRY FROM 10N-20N
E OF 114W.  MOISTURE N OF 20N ENTERS MAINLAND MEXICO WHERE IT 
FEEDS THERMAL LOW PRES WITH CONVECTION LIKELY TO DEVELOP NEXT 
24-48 HRS.

AT THE SURFACE...
GLOBAL MODELS HAVE WEAK HIGH PRES CENTER 1024 MB AT 28N138W 
DRIFTING S INTO BASIN EXPECTED TO WEAKEN NE TRADES W OF 130W  
NEXT 48 HRS BUT SQUEEZE GRADIENT AGAINST MEXICO THERMAL LOW PRES 
AND INCREASE NW WINDS ALONG BAJA CALIFORNIA COAST.

$$
WALLY BARNES