000
AXPZ20 KNHC 240945
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC SUN JUN 24 2012

TROPICAL WEATHER DISCUSSION FOR THE EASTERN PACIFIC OCEAN FROM 
THE EQUATOR TO 32N...EAST OF 140W. THE FOLLOWING INFORMATION IS 
BASED ON SATELLITE IMAGERY...WEATHER OBSERVATIONS...RADAR...AND 
METEOROLOGICAL ANALYSIS.

BASED ON 0600 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH
0915 UTC.

...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
MONSOON TROUGH EXTENDS FROM 23N106W TO 06N123W THEN ITCZ TO 
04N132W TO 04N140W.  SCATTERED MODERATE/ISOLATED STRONG 
CONVECTION WITHIN 75 NM OF AXIS FROM 110W TO 122W.

...DISCUSSION...
LARGE UPPER LEVEL ANTICYCLONE AT 21N129W MAINTAINS VERY DRY 
STABLE SUBSIDING AIR MASS OVER REGION N OF 10N W OF 120W.  
DOWNSTREAM LONGWAVE TROUGH FROM 32N123W TO 23N121W THEN TO 
13N127W EXTEND DRY AREA FURTHER E TO 100W N OF 18N.  NO 
SIGNIFICANT DEEP CONVECTION NOTED ANYWHERE UNDER RIDGE OR 
TROUGH.  SECOND ANTICYCLONE CENTERED OVER 22N105W DOES ADVECT 
LARGE AMOUNT OF TROPICAL MOISTURE AROUND ITS SOUTHERN PERIPHERY 
INTO E PAC JUST E OF MONSOON TROUGH DESCRIBED ABOVE.  SCATTERED 
DEEP CONVECTION ALONG MONSOON TROUGH AXIS BUT STRONG 30-40 KT NE 
TO E WINDS ALOFT CURTAIL MOST CONVECTION EXCEPT WITHIN 75 NM OF 
AXIS FROM 110W TO 122W.

CYCLONE ALOFT OVER 40N130W FORCES DEEP LAYER TROUGH SE INTO NW 
CORNER OF E PAC SUN PUSHING ABOVE MENTIONED ANTICYCLONE FURTHER 
E AND WEAKENING AREA OF FRESH NW BREEZE ALONG CALIFORNIA COAST. 
ASSOCIATED WEAK COLD FRONT DIG SE AND REACH FROM 32N128W TO 
25N140W LATE MON.  WINDS AND SEAS EXPECTED TO REMAIN BELOW 20 KT 
AND 8 FT RESPECTIVELY.

...ELSEWHERE AT THE SURFACE...
HIGH PRES CENTER AT 38N154W HAS RIDGE EXTEND TO 20N120W CAPPING 
ANY MOISTURE UPLIFT NEAR THE SURFACE AND CURTAILING CONVECTION.  
COLD FRONT ENTERING FAR NW PORTION LATE MON IS EXPECTED TO 
BECOME DIFFUSE AS IT MOVES SE INTO STUBBORN RIDGE.

$$
WALLY BARNES