000
AXPZ20 KNHC 271532
TWDEP 

TROPICAL WEATHER DISCUSSION                                    
NWS NATIONAL HURRICANE CENTER MIAMI FL                           
1605 UTC SAT APR 27 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 1200 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
1500 UTC.

...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...           
THE MONSOON TROUGH IS ALONG 06N77W TO 06N81W TO 09N86W TO 
09N90W. THE INTERTROPICAL CONVERGENCE ZONE AXIS EXTENDS FROM 
09N90W TO 10N118W TO 04N130W TO 03N140W. SCATTERED MODERATE 
CONVECTION IS FROM 02N TO 07N BETWEEN 78W AND 82W AND FROM 06N 
TO 08N BETWEEN 85W AND 87W.
     
...DISCUSSION...                                            
UPPER LEVEL SOUTHWESTERLY WINDS DOMINATE ACROSS THE DISCUSSION 
AREA N OF 10N W OF 110W BETWEEN AN ANTICYCLONIC CIRCULATION 
CENTERED NEAR 12N103W AND A PAIR OF UPPER LEVEL LOWS AND 
ASSOCIATED TROUGHING EXTENDING FROM 34N131W TO 28N140W TO A BASE 
NEAR 21N148W. WATER VAPOR IMAGERY INDICATES MODERATE TO STRONG 
DRY AIR AND SUBSIDENCE IN THE VICINITY OF THE UPPER LEVEL TROUGH 
OVER THE NW CORNER OF THE AREA...HOWEVER TROPICAL MOISTURE 
ROOTED WITHIN THE ITCZ REGION S OF 12N CONTINUES TO STREAM 
NORTHEASTWARD SE OF A LINE FROM 16N140W TO 25N124W. MOST 
CONVECTIVE PRECIPITATION REMAINS FOCUSED IN THE VICINITY OF A 
SURFACE TROUGH ANALYZED FROM 08N117W TO 13N118W AND A MID-LEVEL 
LOW CENTERED NEAR 09N111W THAT CONTINUES TO SHOW VERY BROAD 
CYCLONIC TURNING IN THE OVERALL CLOUD PATTERN ON INFRARED 
SATELLITE IMAGERY. THE CONVECTION IS LIKELY ENHANCED DUE TO THE 
MID-LEVEL LOW AND SUFFICIENT UPPER LEVEL DIFFLUENCE. THE SURFACE 
TROUGH ITSELF IS PROVIDING FOR A SMALL AREA OF NE WINDS IN THE 
RANGE OF 20 TO 25 KT FROM 10N TO 16N BETWEEN 116W AND 122W WITH 
SEAS TO 8 FT. THIS AREA OF MAXIMUM WIND AND SEAS IS FORECAST TO 
TRANSLATE WESTWARD OVER THE NEXT 24 HOURS LOCATING BETWEEN 120W 
AND 126W. OTHERWISE...A VERY SMALL AREA OF NE TRADES AT ADVISORY 
CRITERIA WITH SEAS TO 8 FT IS OCCURRING ON THE SOUTHERN 
PERIPHERY OF A SURFACE RIDGE ANCHORED BY A 1031 MB HIGH CENTERED 
NEAR 39N139W GENERALLY FROM 10N TO 16N W OF 122W.

FOR THE REMAINDER OF THE EASTERN PACIFIC BASIN E OF 110W... 
RELATIVELY TRANQUIL CONDITIONS ARE NOTED IN OBSERVATIONAL 
DATA...RECENT OVERNIGHT SCATTEROMETER PASSES...AND LATEST GLOBAL 
MODEL DATA. OF NOTE...SW SWELL FROM A SOUTHERN HEMISPHERE LOW 
PRESSURE SYSTEM WILL CONTINUE SPREADING NORTHEASTWARD AND REACH 
THE MEXICAN AND CENTRAL AMERICAN COAST BY EARLY MONDAY WITH WAVE 
PERIODS IN THE RANGE OF 15 TO 17 SECONDS.

$$
HUFFMAN