000
AXPZ20 KNHC 282204
TWDEP 

TROPICAL WEATHER DISCUSSION    
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
2205 UTC SAT FEB 28 2009

TROPICAL WEATHER DISCUSSION FOR THE EASTERN PACIFIC OCEAN FROM 
THE EQUATOR TO 32N...EAST OF 140W. 

BASED ON 1800 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
2100 UTC.

...ITCZ...

THE INTERTROPICAL CONVERGENCE ZONE IS ALONG THE LINE...05N77W TO 
04N97W TO 00N110W TO 03N130W TO 04N140W. NO SIGNIFICANT 
CONVECTION.

...DISCUSSION...

AMPLIFIED PATTERN REMAINS IN PLACE AS A VIGOROUS UPPER TROUGH 
DIGS NE OF HAWAII ALONG 140W...WITH A BUILDING MID/UPPER RIDGE 
OVER THE WESTERN U.S. THE UPPER TROUGH IS SUPPORTING A COLD 
FRONT FROM ROUGHLY 30N130W TO 16N140W. SCATTEROMETER DATA SHOW 
WINDS TO 30 KT ALONG THE FRONT...THE RESULT OF A TIGHT GRADIENT 
BETWEEN THE FRONT AND 1020 MB SURFACE HIGH PRES NEAR 31N121W. 
LONG PERIOD NW SWELL CONTINUES TO PROPAGATE INTO THE AREA IN 
RESPONSE TO PERSISTENT NW WINDS OVER THE CENTRAL PACIFIC W OF 
THE TROUGH. THE FRONT WEAKENS THROUGH SUN AS THE UPPER SUPPORT 
LIFTS N OF THE AREA. SCATTEROMETER ALSO SHOWS 20 KT NW WINDS 
THROUGH THE GULF OF CALIFORNIA...THE RESULT OF HIGH PRES OVER 
THE CENTRAL ROCKIES. THIS WILL INCREASE SLIGHTLY TONIGHT...THE 
DIMINISH THROUGH SUN. A COLD FRONT MOVING THROUGH THE GULF OF 
MEXICO WILL PUSH INTO TEHUANTEPEC TONIGHT...BRINGING STORM FORCE 
WINDS BY LATE SUN DIMINISHING TO GALES BY MON. PERSISTENT TRADES 
IN THE CARIBBEAN WILL ALLOW GAP WINDS THROUGH THE GULFS OF 
PAPAGAYO AND PANAMA TO PERSIST THROUGH MON. MEANWHILE TRADES S 
OF 15N W OF 110W ARE SOMEWHAT DIMINISHED DUE TO WEAK HIGH PRES N 
OF THE AREA. 

$$
CHRISTENSEN