000
AXPZ20 KNHC 260313
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC TUE OCT 26 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...

THE ITCZ AXIS EXTENDS FROM 08N82W TO 06N91W TO 12N113W TO 
07N126W TO 10N138W TO 09N140W. SCATTERED MODERATE ISOLATED 
STRONG CONVECTION IS OBSERVED WITHIN 30 NM EITHER SIDE OF LINES 
FROM 13N115W TO 10N119W AND FROM 09N136W TO 09N140W.

...DISCUSSION...

AN UPPER TROUGH EXTENDS FROM 25N101W TO 20N110W. AN UPPER 
CYCLONE IS CUTTING OFF NEAR 21N131W WITH THE TROUGH CONTINUING 
SW INTO ANOTHER UPPER CYCLONE AT 14N138W. AN UPPER ANTICYCLONE 
IS CENTERED AT 31N133 WITH A RIDGE COLLAPSING SE TO A CREST AT 
30N103W. UPPER MOISTURE IS INDICATED OVER THE AREA N OF 27N E OF 
130W...WITH DENSE MOISTURE NOTED OVER MOST OF THE SW CONUS. 
OTHERWISE THE UPPER LEVELS ARE VERY DRY ACROSS THE SUBTROPICS... 
N OF 23N W OF 92W. THE UPPER CYCLONE AT 14N138W IS EXPECTED TO 
MOVE N ALONG 138W TUE NIGHT AND WED AS THE UPPER ANTICYCLONE 
MOVES S AND MERGES WITH ANOTHER ANTICYCLONE NEAR 18N115W.

AN UPPER CYCLONE IS OBSERVED NEAR 04N131W WITH AN UPPER TROUGH 
EXTENDING NE TO NEAR 16N126W. AN UPPER RIDGE EXTENDS E OVER THE 
THE ITCZ W OF 132W WITH ITS UPPER DIFFLUENCE ENHANCING THE ITCZ 
CONVECTION ALONG 09N FROM 136W TO BEYOND 140W. THE DEBRIS 
MOISTURE IS SPREADING S TO ALONG 04N WHERE IT EVAPORATES.

AN UPPER ANTICYCLONE IS CENTERED NEAR 17N109W HAS A RIDGE 
EXTENDING W TO A CREST AT 15N119W. THE ASSOCIATED UPPER 
DIFFLUENCE IS ENHANCING CONVECTION ALONG THE LINE FROM 13N115W 
TO 10N119W WITH THE DEBRIS SPREADING N AND EVAPORATING ALONG 
16N. 

ELSEWHERE AT THE SURFACE...A RIDGE EXTENDS FROM 30N130W TO 
14N107W. NORTHERLY WINDS AT 20 KT AND SEAS TO 15 FT WILL PUSH S 
OVER THE PACIFIC WATERS N OF 24N E OF 123W TUE. THE PRES 
GRADIENT S OF THE RIDGE AND N OF THE ITCZ IS PRODUCING AN AREA 
OF 20 TO 25 KT NE TRADE WINDS BETWEEN 10N AND 21N W OF 126W. 
ANOTHER COLD FRONT WILL APPROACH THE NW PORTION ON WED WITH SEAS 
BUILDING TO 15 FT OVER THE NW WATERS BY FRI. MONSOONAL SW FLOW 
AT 15 TO 20 KT CONTINUES FROM 04N TO 07N BETWEEN 82W AND 92W.

$$
NELSON