000
AXPZ20 KNHC 251600
TWDEP 

TROPICAL WEATHER DISCUSSION    
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC SUN JUL 25 2010

TROPICAL WEATHER DISCUSSION FOR THE EASTERN PACIFIC OCEAN
FROM THE EQUATOR TO 32N...EAST OF 140W.

BASED ON 1200 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
1445 UTC.

...ITCZ...
AXIS ALONG 09N84W TO 08N91W TO 14N111W TO 
12N120W TO 12N135W TO 11N140W.  SCATTERED MODERATE TO STRONG 
WITHIN 240 NM OF AXIS E OF 88W AND 240 NM S OF AXIS FROM 104W TO 
108W.  ISOLATED MODERATE WITHIN 45 NM OF AXIS FROM 115W TOD 132W.

...DISCUSSION...
UPPER LEVEL TROUGH PERSISTS OVER NORTHWESTERN PORTION OF BASIN 
FROM 32N128W TO 23N140W DRIFTING SE BUT FINDING STUBBORN RIDGE 
ANCHORED BY TWO ANTICYCLONE...ONE AT 25N119W AND A WEAKER ONE AT 
19N133W...BLOCKING ITS PATH.  MODERATE TO STRONG SUBSIDING AIR 
MASS REMAINS VERY DRY N OF 16N W OF 120W AND N OF 20N W OF 110W.

EASTERNMOST RIDGE ALSO CONTRIBUTE TO ADVECT ENORMOUS AMOUNTS OF 
MOISTURE DEBRIS FROM PERSISTENT SURFACE TROUGH OVER TAMPICO 
MEXICO SOUTHWARD THEN WESTWARD ALONG ITCZ TO 140W.  EASTERLIES 
PREVAIL ALOFT S OF 20N FROM CENTRAL AMERICA TO 140W.  NO SURFACE 
FEATURES TO PROMPT ANY SIGNIFICANT DEEP CONVECTION ALONG ITCZ 
EXCEPT SOUTHERN END OF WEAK TROUGH MOVING W IN WESTERN CARIBBEAN 
ALONG 83W PRODUCING SCATTERED MODERATE ISOLATED STRONG TSTMS.

ELSEWHERE AT THE SURFACE...BROAD 1031 MB HIGH PRES WELL N OF 
AREA HAS RIDGE EXTEND TO 22N114W.  WEAK TROUGH ALONG BAJA 
CALIFORNIA PENINSULA PROMPT FRESH NW BREEZE ON W COAST AND 
MODERATE BREEZE INSIDE GULF OF CALIFORNIA THROOUGH NEXT 30-36 
HRS. 

LONG PERIOD CROSS EQUATORIAL SOUTHERLY SWELL UP TO 9 FT CONTINUE 
ENCROACHING E PAC S OF 10N THROUGH NEXT 48 HOURS WITH MODERATE 
TO FRESH SW BREEZE.

$$
WALLY BARNES