000
AXPZ20 KNHC 070309
TWDEP 

TROPICAL WEATHER DISCUSSION    
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC WED JUL 07 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 AXIS EXTENDS FROM 14N90W TO 07N115W TO 07N140W. SCATTERED 
MODERATE ISOLATED STRONG CONVECTION IS NOTED WITHIN 120 NM OF 
COAST FROM 81W TO 88W AND BETWEEN 92W AND 93W.

...TROPICAL WAVE...
A TROPICAL WAVE IS N OF 07W ALONG 90W. CONVECTION IS ENHANCED 
OVER LAND BETWEEN 88W AND 93W. 

...DISCUSSION...
AN UPPER LEVEL ANTICYCLONE IS CENTERED NEAR 27N128W WITH A RIDGE 
W TO WELL BEYOND 26N140W...AND A RIDGE ALSO EXTENDS E TO 
28N115W. A SMALL UPPER CYCLONE IS OBSERVED OVER THE BAJA 
PENINSULA AT 27N113W. THE UPPER LEVELS ARE VERY DRY N OF 21N W 
OF 110W. 
   
AN UPPER CYCLONE IS OVER THE DEEP TROPICAL PACIFIC AT 06N135W. 
UPPER DEBRIS MOISTURE...THAT ORIGINATED FROM PREVIOUS CONVECTION 
OVER CENTRAL OLD MEXICO...IS ADVECTED W SW AROUND THE PERIPHERY 
OF THE RIDGE...WITHIN 120 NM EITHER SIDE OF LINE FROM 22N105W TO 
15N130W WHERE IT MERGES WITH UPPER MOISTURE...ASSOCIATED WITH 
THE UPPER CYCLONE AT 06N135W...EVAPORATING OVER THE DISCUSSION 
AREA FROM 16N TO 02N BETWEEN 132W AND 145W.
  
AN UPPER ANTICYCLONE IS JUST N OF THE YUCATAN PENINSULA WITH ITS 
ENVELOPE OF ANTICYCLONIC FLOW COVERING THE AREA S OF 20N E OF 
115W. THE ASSOCIATED UPPER DIFFLUENCE IS ENHANCING CONVECTION 
ALONG A TROPICAL WAVE OVER CENTRAL AMERICA AND OVER THE YUCATAN 
PENINSULA...AS WELL AS OVER THE E PACIFIC. THE DEBRIS MOISTURE 
FROM THESE CONVECTIVE AREAS IS SPREADING W OVER THE ENTIRE 
DISCUSSION AREA E OF 100W.

A SURFACE RIDGE EXTENDS FROM 30N140W TO NEAR 13N115W. NORTHERLY 
SWELLS DRIVING SEAS UP TO 10 FT ARE FOUND OVER THE DISCUSSION 
WATERS N OF 24N BETWEEN 117W AND 137W...AND SHOULD DIMINISH 
BELOW 8 FT BY EARLY THU. NW WINDS IN THE 15 TO 20 KT RANGE ARE 
EXPECTED TO CONTINUE ALONG THE W COAST OF THE SOUTHERN BAJA  
PENINSULA S OF 26N FOR A FEW DAYS. 

SOUTHERLY WINDS AT 15 TO 20 KT ARE NOTED OVER THE TROPICAL 
WATERS S OF 07N BETWEEN 79W AND 109W WITH SEAS IN THE 8 TO 10 FT 
RANGE. THESE WINDS ARE EXPECTED TO GRADUALLY DIMINISH BELOW 20 
KT OVER THE NEXT FEW DAYS. SOUTHERLY CROSS EQUATORIAL 
SWELL...WITH RESULTANT SEAS TO 8 FT...IS NOTED ELSEWHERE OVER 
THE AREA W OF 80W AND S OF A LINE FROM CENTRAL AMERICA AT 16N TO 
06N140W AND EXPECTED TO CONTINUE FOR A COUPLE MORE OF DAYS.

$$
NELSON