000
AXPZ20 KNHC 102128
TWDEP 

TROPICAL WEATHER DISCUSSION      
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
2205 UTC TUE JUL 10 2007

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 
21309UTC.

...SPECIAL FEATURE...
TROPICAL DEPRESSION FOUR-E 1006 MB AT 19.4N 121.2W AT 2100 UTC 
MOVING NW AT 7 KT.  MAXIMUM SUSTAINED WINDS 25 WITH GUSTS TO 35 
KT. VISIBLE IMAGERY DEPICTS AN ELONGATED AND ILL-DEFINED 
LOW-LEVEL CIRCULATION. THE CYCLONE HAS LOST ALMOST ALL OF ITS 
DEEP CONVECTION. AS THE T.D. APPROACHES DRIER AIR MASS AND 
COOLER SEA SURFACE TEMPERATURES IT SHOULD SLOWLY WEAKEN.

...TROPICAL WAVES...
TROPICAL WAVE N OF 6N ALONG 94W MOVING W 10 TO 15 KT. SCATTERED 
MODERATE CONVECTION MAINLY WITHIN THE ITCZ FROM 10N TO 14N 
BETWEEN 93W AND 98W. ISOLATED SHOWERS IS IN THE GULF OF 
TEHUANTEPEC.

...ITCZ...
INTERTROPICAL CONVERGENCE ZONE...8N85W 12N108W 13N115W 11N125W 
9N140W. SCATTERED MODERATE CONVECTION WITHIN 70 TO 110 NM S OF 
AXIS BETWEEN 95W AND 107W AND WITHIN 60 NM N OF AXIS FROM 125W 
TO 131W. NUMEROUS STRONG FROM 8N TO 12N BETWEEN 107W AND 115W.

...DISCUSSION...
BROAD UPPER LEVEL ANTICYCLONIC CIRCULATION CENTERED NEAR 16N135W
WITH RIDGE EXTENDING N TO 32N133W. ANTICYCLONIC FLOW COVERS THE 
AREA W OF 125W. SUBSIDENCE WITH ASSOCIATED DRY AIR ALOFT IS FROM 
THE ITCZ TO 23N W OF 124W. UPPER LEVEL MOISTURE IS BEING 
ADVECTED THROUGH THE RIDGE N OF 23N W OF 126W. AN UPPER LEVEL 
TROUGH HAS AXIS ALONG 122W/123W. MODERATE TO STRONG SW WINDS 
AHEAD OF THE TROUGH ARE SHEARING THE TROPICAL DEPRESSION 4E. 
ANOTHER UPPER LEVEL ANTICYCLONIC CIRCULATION IS OVER MEXICO NEAR 
28N104W WITH RIDGE EXTENDING SW TO 17N116W...ANOTHER RIDGE 
EXTENDS SOUTHWARD ACROSS MEXICO INTO THE PACIFIC TO NEAR 
12N100W. AN UPPER LEVEL INVERTED TROUGH EXTENDS FROM NEAR PUERTO 
VALLARTA TO 10N110W.

A SURFACE TROUGH IS ANALYZED ALONG THE ITCZ FROM 16N107W TO 
8N110W. A LARGE AREA OF TSTMS IS FROM 8N-12N BETWEEN 107W-115W.
HIGH PRES RIDGE ENTERS THE AREA NEAR 32N140W TO 21N110W. BROKEN 
TO OVERCAST STRATUS AND STRATOCUMULUS CLOUDS WITHIN THE RIDGE N 
OF 15N W OF 124W AND N OF 20N W OF 115W. TROPICAL DEPRESSION 
FOUR-E IS ENTERING THIS AREA OF STRATUS CLOUDS.

$$
GR