000
AXPZ20 KNHC 231550
TWDEP 

TROPICAL WEATHER DISCUSSION    
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC FRI JUL 23 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 15N92W TO 11N104W TO 12N118W TO 08N132W TO 09N140W TO 
09N140W.  SCATTERED MODERATE ISOLATED STRONG CONVECTION WITHIN 
90 NM N AND 60 NM S OF AXIS E OF 126W.

...DISCUSSION...
SHARP UPPER LEVEL TROUGH DIGS SW FROM 32N135W TO 18N140W IS 
BLOCKED FROM FURTHER EASTWARD MOVEMENT BY STUBBORN STATIONARY 
ANTICYCLONE AT 24N118W.  BOTH SYSTEM KEEP AIR MASS UNDER THEM 
VERY DRY WITH MODERATE TO STRONG SUBSIDENCE.  WELL DEFINED 
CYCLONIC VORTEX OVER WESTERN TEXAS HAS SHORT TROUGH EXTEND S-SE 
TO CENTRAL MEXICO WITH AN ILL-DEFINED ANTICYCLONIC GYRE NEAR 
26N100W.  GYRE PRODUCES GOOD OUTFLOW FOR SURFACE LOW PRES SYSTEM 
THAT JUST MOVE INLAND MEXICO FROM BAY OF CAMPECHE.  CONVECTIVE 
DEBRIS FROM LOW PRES IS ADVECTED INTO E PAC E OF 110W...BUT LACK 
OF UPLIFTING MECHANICS CURTAILS NEW CONVECTION TO SPROUT.  

S OF 15N THE UPPER LEVELS ARE TAMED WITH A STEADY ALLOWANCE OF 
EASTERLY FLOW ADVECTING PLENTY OF MOISTURE BUT WITH ONLY 
SCATTERED MODERATE ISOLATED STRONG CONVECTION ASSOCIATED E OF 
126W. 

ELSEWHERE AT THE SURFACE...
HIGH PRES 1032 MB WELL NW OF BASIN HAS RIDGE EXTEND THROUGH 
15N120W.  FRESH NW BREEZE EXPECTED WITHIN 12 HRS ALONG W COAST 
OF BAJA CALIFORNIA AS HIGH PRES DRIFT E.   

CROSS EQUATORIAL SOUTHERLY SWELLS REACHING 10 FT CONTINUE MAINLY 
OVER CENTRAL PORTION OF E PAC S OF 12N.

$$
WALLY BARNES