000
AXPZ20 KNHC 271544
TWDEP 

TROPICAL WEATHER DISCUSSION   
NWS NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC FRI MAY 27 2011

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.
 
...ITCZ...
AXIS EXTENDS FROM 07N80W TO 10N91W TO 08N120W TO 06N140W.  
SCATTERED MODERATE CONVECTION WITHIN 150 NM OF AXIS E OF 108W  
AND WITHIN 120 NM OF AXIS W OF 115W.

...DISCUSSION...
UPPER LEVEL TROUGH ACROSS NW CORNER OF BASIN FROM 32N136W TO 
WELL DEFINED CYCLONIC VORTEX AT 25N140W SEEMS TO BE RETROGRADING 
AS EXPANDING DOWNSTREAM RIDGE FORCES IT W.  BROAD RIDGE WITH 
DUAL ANCHORING ANTICYCLONES...ONE AT 18N112W AND ANOTHER AT 
06N79W...COVER REMAINDER OF E PAC.  WEAK SHALLOW TROUGH NEAR 
GULF OF TEHUANTEPEC SPLIT BOTH GYRES.  MODERATE DIFFLUENCE ALOFT 
OVER WEAK SURFACE TROUGH ALONG 93W ENHANCES MODERATE CONVECTION 
E OF 96W ALONG ITCZ...BUT NO TROPICAL ORGANIZATION NOTED NOR 
EXPECTED.      

...ELSEWHERE AT THE SURFACE...
SEMI-PERMANENT TROUGH OVER MEXICO COMBINES WITH BROAD RIDGE 
ALONG 31N ANCHORED AT 32N150W BY 1029 MB HIGH PRES CENTER.  
FRESH NW WINDS W OF BAJA CALIFORNIA COAST ACCOMPANIED BY 10-12 
FT SEAS N OF 24N E OF 123W AS NEAR GALE WINDS NOTED JUST N OF 
30N.  LITTLE CHANGE EXPECTED THROUGH FORECAST PERIOD AS HIGH 
PRES CENTER DRIFT NE.  FRESH NE TRADE WINDS FROM 08N TO 24N W OF 
125W ALSO CAUSED BY HIGH PRES RIDGE SUSTAIN LITTLE CHANGE DURING 
FORECAST PERIOD. 

JUST AS PREVIOUS SURGE OF CROSS EQUATORIAL SW SWELLS START 
SUBSIDING...SECOND TRAIN OF LARGE LONG PERIOD SW SWELL SPREAD NE 
AND REBUILD SEAS TO 10-11 FT S OF 10N BY END OF FORECAST PERIOD.

$$
WALLY BARNES