000
AXPZ20 KNHC 030949
TWDEP 

TROPICAL WEATHER DISCUSSION                                   
NWS NATIONAL HURRICANE CENTER MIAMI FL                         
1005 UTC WED APR 03 2013

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 
0900 UTC.

...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...              
MONSOON TROUGH AXIS FROM 06N78W TO 09N85W TO 05N90W TO 04N97W 
THEN ITCZ AXIS 03N108W TO 03N127W.  SCATTERED MODERATE TO STRONG 
CONVECTION WITHIN 120 NM S OF AXIS FROM 88W TO 92W.  SCATTERED 
MODERATE CONVECTION WITHIN 60 NM OF AXIS FROM 117W TO 122W.

...DISCUSSION...                                               
LARGE AMPLITUDE UPPER LEVEL TROUGH EXTEND ALL THE WAY ACROSS BASIN 
ALONG 106W WITH DRY AIR MASS WITHIN 3 DEGREES EITHER SIDE OF AXIS.  
SIMILARLY...BROAD RIDGE WITH AXIS ACROSS BASIN ALONG 125W BRINGS
LARGE AMOUNT OF TROPICAL MOISTURE ON ITS EASTERN SIDE RIDING 75 KT
JET CORE.  DEEP LAYER CYCLONE NW OF E PAC HAS SHARP TROUGH AXIS ALONG
145W IN SUPPORT OF COLD FRONT CURRENTLY EXTENDING FROM 32N137W TO
26N140W.  MODERATE DIVERGENCE ALOFT PROMPTS SCATTERED MODERATE 
CONVECTION ASSOCIATED WITH FRONT.

...ELSEWHERE AT THE LOWER LEVELS...
HIGH PRES CENTER 1022 MB AT 29N125W BLOCKS EASTERN MOVE OF COLD FRONT
WHICH THEN WEAKENS AS IT MOVES NE OUT OF BASIN.  HIGH PRES STRENGTHENS
TO 1027 MB AND DRIFT W INCREASING NE TRADES TO A FRESH BREEZE FROM 10N
TO 20N W OF 125W...WHILE DIMINISHING NW WINDS ALONG COAST OF BAJA
CALIFORNIA LATER TODAY.  LARGE AREA OF MIXED SWELLS LINGER MOSTLY 
W OF 110W. 

...OUTLOOK... 
WEATHER OVER WESTERN SIDE OF E PAC EXPECTED TO DETERIORATE AS LARGE
OMEGA BLOCK FORMS AT THE UPPER LEVELS AND DEEP LAYER CYCLONE MOVES 
ACROSS 140W BRINGING LARGE AMOUNT OF TROPICAL MOISTURE INTO THE REGION. 

$$
WALLY BARNES