000
AXPZ20 KNHC 250328
TWDEP 

TROPICAL WEATHER DISCUSSION    
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
0445 UTC WED APR 26 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 0000 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0300 UTC.

...ITCZ...
ITCZ AXIS ALONG...6N77W  9N88W  10N112W  6N134W  4N140W.  
SCATTERED MODERATE WITHIN 30 NM OF AXIS E OF 86W.  SCATTERED 
MODERATE ISOLATED STRONG WITHIN 120 NM N OF AXIS W OF 99W.

...DISCUSSION...
UPPER LEVELS...
UPPER LEVEL CYCLONIC CIRCULATION AT 25N135W HAS INTENSIFIED AS 
IT SPEEDS NE ERODING UPPER LEVEL RIDGE WHICH WAS IN PLACE.  
VORTEX BRINGING DRY AIR MASS AND CYCLONIC FLOW...ALTHOUGH NOT 
VERY STRONG...ALOFT W OF 130W.  UPPER LEVEL TROUGH MEANDERS FROM 
VORTEX TO 26N126W 25N114W 23N106W WITH DRY AIR MASS WITHIN 90 NM 
OF AXIS.  JET STREAM ALSO PICKING UP SOME POWER...NOW TO 105 
KT...S OF TROUGH AXIS ADVECTING ITCZ DEBRIS MOISTURE INTO MID 
LATITUDES BUT TROUGH AXIS KEEPS IT S OF 20N W OF 110W.   
 
MID/UPPER LEVEL ANTICYCLONE AT 12N110W HAS CREST BEING FLATTENED 
BY STRONG DEEP LAYER TROUGH OVER SW CONUS BUT KEEPS AREA E OF 
105W QUITE DRY WITH MODERATE TO STRONG SUBSIDENCE AND 
EFFECTIVELY CUT OFF FLOW OF MOISTURE INTO GULF OF MEXICO.  

AT THE SURFACE...
BROAD HIGH PRES CENTER 1033 MB AT 33N141W HAS RIDGE EXTEND TO 
15N105W CURTAILING CLOUD DEVELOPMENT N OF 14N W OF 105W.  USUAL 
TRADES REMAIN BASICALLY UNCHANGED THROUGH FORECAST PERIOD BUT 
SWELL TRAINS FROM BOTH SIDES...10-15 FT FROM THE NW AND 8-9 FT 
FROM THE SW SNEAK INTO E PAC W OF 115W.

$$
WALLY BARNES