000
AXPZ20 KNHC 110317
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL 
HURRICANE CENTER MIAMI FL
0405 UTC FRI AUG 11 2006

TROPICAL WEATHER DISCUSSION FOR THE EASTERN PACIFIC OCEAN FROM 
THE EQUATOR TO 32N...EAST OF 140W. THE FOLLOWING INFORMATION IS 
BASED ON SATELLITE IMAGERY...WEATHER OBSERVATIONS...RADAR...AND 
METEOROLOGICAL ANALYSIS.

BASED ON 0000 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0315 UTC.

...TROPICAL WAVES...

A TROPICAL WAVE ALONG 130W TO THE N OF 2N HAS MOVED W 12 KT 
DURING THE PAST 24 HOURS. CONVECTION IS ENHANCED ALONG THE ITCZ 
FROM 6N TO 11N WITH BROAD CYCLONIC TURNING NOTED.

A TROPICAL WAVE IS N OF 5N ALONG 97W AND HAS MOVED W AT ABOUT 18 
KT THE PAST 24 HOURS. ONLY A FEW CLUSTERS OF CONVECTION IS NOTED 
WITHIN THE 60 NM EITHER SIDE OF THE WAVE AXIS ALONG THE ITCZ.

...ITCZ...

ITCZ AXIS IS CENTERED ALONG 5N79W 12N119W 7N140W. ISOLATED 
MODERATE AND STRONG WITHIN 90 NM EITHER SIDE OF LINE 7N84W 
11N116W. SCATTERED MODERATE ISOLATED STRONG WITHIN 150 NM EITHER 
SIDE OF LINE 14N117W 8N140W. 

...DISCUSSION...

AN UPPER ANTICYCLONE IS CENTERED NEAR 33N110W WITH A RIDGE 
EXTENDING SW TO A CREST AT 22N140W. TO THE N OF THE RIDGE AN 
UPPER SHORTWAVE IS PASSING TO THE E WITH ITS AXIS EXTENDING S TO 
NEAR 32N132W AT THE MOMENT. 

AN ILL-DEFINED UPPER CYCLONE IS ESTIMATED NEAR 12110W WITH AN 
INVERTED UPPER TROUGH EXTENDING N TO NEAR 19N111W. ANOTHER UPPER 
CYCLONE IS NOTED NEAR 18N127W AND IS SHIFTING WSW WITH TIME. AN 
UPPER CYCLONE IS NEAR EQ134W AND NOW APPEARS TO BE SHIFTING S 
AND FILLING WITH TIME. BETWEEN THESE CYCLONES...AN UPPER 
ANTICYCLONE IS CENTERED NEAR 17N118W WITH A RIDGE N TO A CREST 
AT 21N118W. CONVECTION IS ENHANCED UNDER THE RIDGE NEAR 
14N119W...BUT IS DECREASING SINCE SUNSET. 

DRY UPPER AIR IS NOTED WITHIN 180 NM EITHER SIDE OF LINE 33N121W 
19N138W. OTHERWISE UPPER DEBRIS MOISTURE ORIGINATING FROM ITCZ 
CONVECTION IS NOTED THROUGHOUT THE TROPICAL AREA N OF 4N E OF
122W.  

AT THE SURFACE...A RIDGE EXTENDS FROM 32N140W SE TO 20N110W. 
BROKEN STRATOCUMULUS CLOUDS ARE NOTED N OF 13N W OF 116W. 

GAPS WINDS...ANOTHER NE SURGE TO 20 KT WAS NOTED AT SUNRISE THU 
MORNING IN THE GULF OF PAPAGAYO...BUT LATEST SHIP REPORTS AND 
QSCAT PASS AT 00 UTC INDICATE THAT WINDS HAVE DECREASED BELOW 20 
KT.
 
$$
NELSON