000
AXPZ20 KNHC 241602
TWDEP 

TROPICAL WEATHER DISCUSSION    
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC SAT JUL 24 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 
1545 UTC.

...ITCZ...
AXIS ALONG 10N85W TO 13N115W TO 10N140W.  SCATTERED MODERATE 
CONVECTION WITHIN 60 NM OF AXIS FROM 102W TO 119W.  ISOLATED 
MODERATE CONVECTION WITHIN 60 NM OF AXIS ELSEWHERE ALONG AXIS. 

...DISCUSSION...
SHARP UPPER LEVEL TROUGH PERSISTS ACROSS FAR NW PORTION OF AREA 
FROM 32N132W TO 23N140W.  TROUGH BLOCKED FROM PROGRESSING 
FURTHER E BY WELL ANCHORED UPPER LEVEL ANTICYCLONE AT 25N115W 
JUST W OF BAJA CALIFORNIA WITH EXTENDED RIDGE TO SECOND GYRE AT 
17N134W.  SYSTEMS MAINTAIN DRY AND STABLE CONDITIONS UNDER 
MODERATE TO STRONG SUBSIDENCE EVIDENT N OF 15N W OF 115W. 

ABOVE ANTICYCLONE COMBINES WITH WELL DEFINED CYCLONIC VORTEX 
OVER WESTERN GULF OF MEXICO TO CHANNEL ABUNDANT AMOUNT OF  
MOISTURE FROM NORTHERN LATITUDES S THROUGH MEXICO INTO E PAC S 
OF 15N.  ZONAL EASTERLY FLOW ADVECT THIS MOISTURE ALONG ITCZ 
WESTWARD BUT LACK OF UPLIFTING MECHANISMS PREVENT ANY 
SIGNIFICANT DEEP CONVECTION FROM BUILDING UP.

ELSEWHERE AT THE SURFACE...LARGE HIGH PRES CENTER 1025 MB WELL N 
OF AREA EXTEND TO SECOND HIGH PRES CENTER 1018 MB AT 25N136W. 
VERY WEAK TROUGH TRAPPED BETWEEN RIDGES MAINTAIN FRESH NW BREEZE 
PERSIST WITHIN 90 NM OF W COAST OF BAJA CALIFORNIA FROM 24N-28N 
AS HIGH PRES DRIFTS E-SE.  TIGHTENING PRES GRADIENT MAY PRODUCE 
FRESH SOUTHERLY WINDS INSIDE GULF OF CALIFORNIA WITHIN 36 HOURS  
AND BEYOND. 

ELSEWHERE CROSS EQUATORIAL SOUTHERLY SWELL REACHING 10 FT WITH 
PERIODS OF 14-15 SECONDS CONTINUES TO AFFECT AREA S OF 13N AND 
WILL PERSIST THROUGH 48 HOURS.

$$
WALLY BARNES