000
AXPZ20 KNHC 202112
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
2205 UTC FRI AUG 20 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 
2100 UTC.

...SPECIAL FEATURE...
TROPICAL DEPRESSION EIGHT-E IS CENTERED NEAR 19.6N109.2W. THE 
ESTIMATED SEA LEVEL PRESSURE IS 1003 MB. THE SYSTEM IS MOVING 
NORTHWEST AT 8 KT. THERE ARE SCATTERED SHOWERS AND THUNDERSTORMS 
WITHIN 120 NM SW SEMICIRCLE. 

...ITCZ...

THE INTERTROPICAL CONVERGENCE ZONE AXIS IS ANALYZED ALONG 
10N110W TO 11N132W TO 09N135W TO 10N140W. ISOLATED MODERATE TO 
STRONG CONVECTION WITHIN 60 NM OF AXIS. 


...DISCUSSION...

AN UPPER LEVEL ANTICYCLONE IS CENTERED NEAR 24N127W WITH RIDGE 
EXTENDING SW TO 20N140W AND NE TO 30N106W WHERE ANOTHER UPPER 
LEVEL ANTICYCLONE IS CENTERED. DRY AIR ALOFT IS INDICATED BY 
WATER VAPOR IMAGERY N OF 20N W OF 120W. NE TO E FLOW ALOFT IS 
NOTED OVER THE DEEP TROPICS WITH SIGNIFICANT MID/UPPER LEVEL 
MOISTURE E OF 120W.  

AT THE SURFACE...A SURFACE RIDGE COVERS THE AREA N OF 20N W OF 
120W. A SURFACE 1011 MB LOW IS EMBEDDED WITHIN THE ITCZ NEAR 
11N132W. 

CROSS EQUATORIAL S SWELL CONTINUES TO SPREAD N WITH SEAS TO 12 
FT OVER S CENTRAL WATERS AND SE WATERS TO THE COAST OF MEXICO 
AND W PANAMA. THIS LONG PERIOD SWELL IS EXPECTED TO BRING SEAS 
OF 8 TO 10 FT TO THE REMAINDER OF THE COAST S OF 20N BY EARLY 
SAT MORNING. AT THE SAME TIME...A NEW BATCH OF LONG PERIOD 
SWELLS FROM THE S WILL AFFECT THE SW WATERS.

$$
AL