000
AXPZ20 KNHC 040413
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC THU OCT 04 2007

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 
0315 UTC.
  
...TROPICAL WAVE...
TROPICAL WAVE ALONG 105.5W N OF 5N MOVING W 12 KT. SCATTERED 
MODERATE CONVECTION NOTED WITHIN 60 NM OF THE WAVE AXIS FROM 10N 
TO 13N.

...ITCZ...
INTERTROPICAL CONVERGENCE ZONE...AXIS ALONG 9N78W 11N110W 8N125W 
10N140W. SCATTERED MODERATE NOTED FROM 7N TO 15N E OF 115W.

...DISCUSSION...
AN UPPER TROUGH DOMINATES THE DISCUSSION AREA W OF A LINE FROM 
32N117W 19N140W. TWO EMBEDDED CYCLONES ARE NOTED WITHIN THE 
BROAD TROUGH...ONE WEAKENING NEAR 32N118W...AND ANOTHER NEAR 
28N123W. A NARROW MOISTURE PLUME IS NOTED ALONG 15N140W 
19N135W...OTHERWISE THE UPPER LEVELS ARE DRY N OF 15N W OF 110W 
AND S OF 15N W OF 120W...AND EFFECTIVELY SUPPRESSES ITCZ 
CONVECTION W OF 118W.
   
AN UPPER ANTICYCLONE IS OVER OLD MEXICO AT 27N103W WITH A RIDGE 
EXTENDING SW TO 17N123W. IMMEDIATELY TO THE E OF THIS RIDGE... 
AN UPPER TROUGH EXTENDS SW ACROSS CENTRAL AMERICA INTO THE AREA 
ALONG 20N96W TO 12N100W. TO THE EAST OF THIS TROUGH...AN UPPER 
RIDGE EXTENDS INTO THE DISCUSSION AREA N OF 7N E OF 87W. UPPER 
DIFFLUENCE ALONG THE SOUTHERN PERIPHERY OF THIS RIDGE...AND 
BETWEEN THE RIDGE AND THE CENTRAL AMERICAN UPPER TROUGH... 
COMBINES TO ENHANCE ITCZ CONVECTION E OF 108W.  DRY UPPER AIR IS 
NOTED S OF 7N E OF 120W.

ELSEWHERE AT THE LOW LEVELS...A RIDGE EXTENDS SW INTO THE AREA 
ALONG 32N140W 15N120W. THE REMNANTS OF JULIETTE ARE DISSIPATING 
NEAR 24N115W. 
  
$$
NELSON