000
AXPZ20 KNHC 171514
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC TUE AUG 17 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.

...TROPICAL WAVE...

A TROPICAL WAVE IS N OF 10N ALONG 88W HAS BEEN MOVING W AT 8 KT. 
ONLY LIMITED CONVECTION IS ASSOCIATED WITH THIS WAVE. 

...ITCZ...

THE INTERTROPICAL CONVERGENCE ZONE AXIS WAS ANALYZED FROM 10N86W 
TO 07N101W TO 10N120W TO 07N140W. NO SIGNIFICANT CONVECTION LIES 
NEAR THE ITCZ AT THIS TIME. 10-1ISOLATED MODERATE WITHIN 60 NM 
EITHER SIDE OF AXIS E OF 130W. 

...DISCUSSION...

AN UPPER LEVEL ANTICYCLONE IS CENTERED NEAR 22N132W WITH RIDGE 
EXTENDING SW TO BEYOND 19N140W AND NORTHEAST TO BEYOND 30N116W. 
THE REGION N OF 12N W OF 133W IS MARKED BY SUBSIDENCE AND 
RELATIVELY DRY CONDITIONS. AN UPPER TROUGH LIES ALONG 122W 
BETWEEN 10N AND 20N. OTHERWISE...EASTERLY FLOW PREVAILS IN THE 
DEEP TROPICS. 

AT THE SURFACE...A SURFACE RIDGE EXTENDS FROM 1025 MB HIGH 
PRESSURE CENTERED NEAR 36N144W TO 25N120W. 1008 MB LOW PRES 
SYSTEM LIES NEAR 22N112W. AFTER LINGERING WITHIN THE MONSOON 
TROUGH THE PAST SEVERAL DAYS...THIS LOW IS FINALLY EXPECTED TO 
DISSIPATE TODAY.  

CROSS EQUATORIAL SWELL UP TO 8 FT OVER S CENTRAL WATERS SLOWLY 
MOVE NORTH OF 10N BY LATE WED NIGHT. THIS SWELL WILL GRADUALLY 
MAKE ITS WAY E OF THE GALAPAGOS ISLANDS...AND SEAS WILL REACH 8 
FT OFF THE COAST OF PANAMA NEAR 06N BY THE END OF THE FORECAST 
PERIOD EARLY THU MORNING.

$$
AL