000
AXPZ20 KNHC 191503
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC MON APR 19 2010

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...

THE ITCZ AXIS EXTENDS FROM 05N77W TO 06N85W TO 06N128W TO 
04.5N140W. SCATTERED MODERATE TO STRONG CONVECTION WITHIN 180 NM 
S OF AXIS E OF 80W. SCATTERED MODERATE ISOLATED STRONG 
CONVECTION WITHIN 150 NM S OF AXIS BETWEEN 103W AND 122W. 
ISOLATED MODERATE TO STRONG CONVECTION WITHIN 150 NM N OF AXIS 
BETWEEN 131W AND 134W. ISOLATED MODERATE TO STRONG CONVECTION 
WITHIN 120 NM S OF AXIS W OF 138W. 

...DISCUSSION...

AN UPPER TROUGH PREVAILS N OF 20N E OF 121W WITH AXIS EXTENDING 
ALONG 116W. A SHORTWAVE RIDGE IS BETWEEN 121W AND 130W...WITH 
THE BASE OF AN UPPER TROUGH JUST ENTERING THE NW PART OF THE 
AREA. AN UPPER LEVEL ANTICYCLONE IS CENTERED NEAR 
07.5N110W..WITH BROAD ANTICYCLONIC FLOW COVERING THE AREA S OF 
20N BETWEEN 100W AND 127W. AN UPPER TROUGH WITH AXIS EXTENDING S 
OVER THE EASTERN GULF OF MEXICO TO THE E PACIFIC AT 14N90W TO 
THE EQUATOR AT 94W IS TO THE E OF THIS ANTICYCLONE..WITH ANOTHER 
TROUGH W OF THE ANTICYCLONE S OF 10N WITH AXIS ALONG 130W. 

AT THE SURFACE...HIGH PRES OF 1014 MB IS MEANDERING NEAR 28N117W 
AND IS LOSING IDENTITY. LOW PRES NEAR 30N125W 1012 MB WITH 
FRONTAL TROUGH TO 25N122W TO 14N140W QUICKLY LOSING  
BAROCLINICITY AS IT BECOMES ORIENTATED N TO S AND GRADUALLY 
DISSIPATE ALONG 120W OVER THE NEXT DAY OR SO. HIGH PRESSURE WILL 
BUILD FROM THE NW AS THESE FRONTAL TROUGHS WASH OUT DRIVING A 
NEW SERIES OF NW SWELL ACROSS THE NW WATERS STARTING TONIGHT. NE 
TRADES ALSO EXPECTED TO INCREASE AGAIN TO 20 KT OVER THE TROPICS 
W OF 130W. 

$$
AL