000
AXPZ20 KNHC 101554
TWDEP 

TROPICAL WEATHER DISCUSSION    
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC THU MAY 10 2007

TROPICAL WEATHER DISCUSSION FOR THE EASTERN PACIFIC OCEAN FROM 
THE EQUATOR TO 32N...EAST OF 140W. THE FOLLOWING INFORMATION IS 
BASED ON SATELLITE IMAGERY...WEATHER OBSERVATIONS...RADAR...AND 
METEOROLOGICAL ANALYSIS.

BASED ON 1200 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
1445 UTC.

...ITCZ...
INTERTROPICAL CONVERGENCE ZONE AXIS AXIS ALONG 8N77W  10N94W  
9N117W  4N140W.  NUMEROUS STRONG WITHIN 210 NM OF 9N116W. 
ISOLATED MODERATE WITHIN 90 NM OF AXIS E OF 103W.  

...DISCUSSION...
LONGWAVE UPPER LEVEL TROUGH WITH AXIS FROM 32N140W TO EQUATOR AT 
128N BRINGS VERY DRY SUBSIDING AIR MASS WITHIN 120 NM E AND 
ENTIRE AREA W OF AXIS.  AREA OF DIFFLUENT FLOW SUPERIMPOSED OVER 
SURFACE TROUGH ALONG 116W IN ITCZ PRODUCED LARGE BURST OF 
CONVECTION WITH NUMEROUS TSTMS WITHIN 210 NM OF CENTER NEAR 
9N116W.  

DOWNSTREAM...MID TO UPPER LEVEL ANTICYCLONE CENTER AT 9N94W HAS 
RIDGE EXTEND W TO 110W.  MOIST DEBRIS FROM ITCZ CONVECTION BEING 
ADVECTED NE BY WEAK 60 KT WIND CORE UNTO CENTRAL MEXICO.  
ELSEWHERE RIDGE MAINTAINS FLOW OF MOISTURE OUT OF COLOMBIA INTO 
ITCZ LATITUDES BUT DRY S OF 6N.  

AT THE SURFACE...CENTRAL PAC ANTICYCLONE CENTER 1041 MB WELL NW 
OF AREA HAS RIDGE EXTEND TO 15N105W.  TRADE WINDS REMAIN WELL 
BELOW NORMAL BUT EXPECTED TO REBUILD BEYOND 48 HRS.  NO OTHER 
SURFACE SIGNIFICANT FEATURE OBSERVED.

$$
WALLY BARNES