000
AXPZ20 KNHC 201523
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC TUE APR 20 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 05.5N77W TO 08N102W TO 04N140W. 
SCATTERED MODERATE ISOLATED STRONG CONVECTION WITHIN 120 NM N OF 
AXIS E OF 85W. SCATTERED MODERATE TO STRONG CONVECTION WITHIN 
180 NM S OF AXIS BETWEEN 115W AND 128W. SCATTERED MODERATE TO 
STRONG CONVECTION WITHIN 180 NM N OF AXIS WEST OF 135W.   

...DISCUSSION...

A BROAD UPPER TROUGH PREVAILS ACROSS THE AREA N OF 24N. IN THE 
DEEP TROPICS...AN UPPER LEVEL ANTICYCLONE IS CENTERED NEAR 
06N108W WITH RIDGE EXTENDING N ACROSS BAJA PENINSULA INTO THE 
WESTERN U.S.. ELSEWHERE IN THE DEEP TROPICS...W OF THE UPPER 
ANTICYCLONE IS A SHORTWAVE TROUGH WITH AXIS ALONG 125W AND WEST 
OF THIS FEATURE IS A RIDGE W OF 130W. E OF THE UPPER ANTICYCLONE 
IS ANOTHER SHORTWAVE TROUGH WITH AXIS ALONG 92W...WITH UPPER 
RIDGE E OF 89W. 
 
AT THE SURFACE...STRONG HIGH PRESSURE 1031 MB IS CENTERED NEAR 
36N148W. THIS FEATURE HAS BROUGHT A RESURGENCE OF TRADES ACROSS 
THE AREA WITH 20 KT WINDS N OF 23N W OF 127W...AND FROM 06N TO 
14N W OF 130W. A NEW SERIES OF NW SWELL WILL SPREAD E AND S FROM 
THE NW...AND WILL MIX WITH NE WIND WAVES GENERATED FROM THE 
INCREASING TRADEWIND FLOW. SOUTHERLY SWELLS WILL CROSS THE 
EQUATOR BETWEEN 93W AND 125W FOR THE NEXT COUPLE OF DAYS.

$$
AL