000
AXPZ20 KNHC 142147
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
2205 UTC WED APR 14 2010

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 
2130 UTC.

...ITCZ...

AXIS ALONG 05N77W TO 07N86W TO 02N103W TO 07N116W TO 06N140W. 
SCATTERED MODERATE CONVECTION WITHIN 180 NM EITHER SIDE OF AXIS 
BETWEEN 88W AND 92W. SCATTERED MODERATE ISOLATED STRONG 
CONVECTION WITHIN 120 NM N AND 60 NM S OF AXIS BETWEEN 98W AND 
108W. SCATTERED MODERATE TO STRONG CONVECTION WITHIN 60 NM 
EITHER SIDE OF AXIS BETWEEN 114W AND 120W. SCATTERED MODERATE 
ISOLATED STRONG CONVECTION WITHIN 120 NM EITHER SIDE OF AXIS W 
OF 138W. 

...DISCUSSION...

AN UPPER LEVEL CYCLONE IS POSITIONED NW OF THE DISCUSSION AREA 
NEAR 35N145W WITH A TROUGH EXTENDING TO 31N150W TO 25N171W. OVER 
THE FORECAST AREA...SLIGHTLY ANTICYCLONIC FLOW PREVAILS N OF 
15N. S OF 15N...AN UPPER LEVEL ANTICYLONE IS CENTERED NEAR 
10N129W. THIS UPPER LEVEL FEATURE IS BEING MAINTAINED BY LATENT 
HEAT RELEASE FROM ACTIVE ITCZ CONVECTION W OF 114W. AN UPPER 
LEVEL TROUGH AXIS EXTENDS FROM JUST E OF THE YUCATAN PENINSULA 
TO 08N89W...WITH LIMITED ITCZ CONVECTION E OF 98W. 

AT THE SURFACE...LOW PRESSURE 1010 MB ASSOCIATED WITH THE UPPER 
LEVEL LOW MENTIONED ABOVE IS CENTERED NEAR 31N145W WITH COLD 
FRONT EXTENDING FROM THE LOW TO 27N142W TO 21N147W. THIS COLD 
FRONT WILL ENTER THE NW PART OF THE FORECAST AREA OVERNIGHT. 
SURFACE HIGH PRESSURE 1021 MB IS CENTERED NEAR 29N128W. THE 
PRESSURE GRADIENT BETWEEN THIS HIGH AND LOWER PRESSURE 
ASSOCIATED WITH THE ITCZ IS SUPPORTING NE TRADES OF 20 KT FROM 
09N TO 16N W OF 114W. THE ASSOCIATED SHORT PERIOD NE WIND SEAS 
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/FORMOSA