000
AXPZ20 KNHC 150242
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC THU APR 15 2010

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

BASED ON 0000 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0245 UTC.

...ITCZ...

AXIS ALONG 02N78W TO 05N88W TO 04.5N105W TO 07N115W TO 05N140W. 
SCATTERED MODERATE TO STRONG WITHIN 240 NM N OF AXIS BETWEEN 
107W AND 121W. ISOLATED MODERATE TO STRONG WITHIN 180 NM N OF 
AXIS W OF 125W.  

...DISCUSSION...

AN UPPER LEVEL LOW IS POSITIONED NW OF THE DISCUSSION AREA NEAR 
36N144W WITH A TROUGH EXTENDING TO 31N146W TO 24N171W. OVER THE 
FORECAST AREA...ANTICYCLONIC FLOW PREVAILS N OF 15N. S OF 
15N...AN UPPER LEVEL ANTICYLONE IS CENTERED NEAR 09N121W. THIS 
UPPER LEVEL FEATURE IS BEING MAINTAINED BY LATENT HEAT RELEASE 
FROM ACTIVE ITCZ CONVECTION W OF 107W. AN UPPER LEVEL TROUGH 
AXIS EXTENDS FROM JUST E OF THE YUCATAN PENINSULA TO 
08N88W...WITH LIMITED ITCZ CONVECTION E OF 107W. 

AT THE SURFACE...LOW PRESSURE 1011 MB ASSOCIATED WITH THE UPPER 
LEVEL LOW MENTIONED ABOVE IS CENTERED NEAR 31N143W WITH COLD 
FRONT EXTENDING FROM THE LOW INTO THE FAR NW PART OF THE AREA. 
WEAKENING SURFACE HIGH PRESSURE 1021 MB IS CENTERED NEAR 
29N127.5W. THE PRESSURE GRADIENT BETWEEN THIS HIGH AND LOWER 
PRESSURE ASSOCIATED WITH THE ITCZ IS SUPPORTING NE TRADES OF 20 
KT FROM 07N TO 16N W OF 114W. THE ASSOCIATED SHORT PERIOD NE 
WIND WAVES ARE COMMINGLING WITH LONG PERIOD NW SWELL AND CROSS 
EQUATORIAL LONG PERIOD SW SWELL THAT HAS BEEN PROPAGATING N 
ACROSS THE DISCUSSION AREA DURING THE PAST SEVERAL DAYS.

$$
AL