000
AXPZ20 KNHC 270331
TWDEP 

TROPICAL WEATHER DISCUSSION   
NWS NATIONAL HURRICANE CENTER MIAMI FL
0405 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 0000 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0300 UTC.
 
...ITCZ...
AXIS IS CENTERED FROM 13N90W TO 13N103W TO 10N110W TO 07N130W TO 
06N140W. SCATTERED MODERATE CONVECTION IS FROM 05N TO 08N 
BETWEEN 82W AND 87W. ISOLATED MODERATE CONVECTION IS FROM 09N TO 
13N BETWEEN 91W AND 97W...FROM 07N TO 09N BETWEEN 113W AND 
120W...AND FROM 04N TO 08N BETWEEN 133W AND 138W.    

...DISCUSSION...

IN THE UPPER LEVELS...
AN UPPER LEVEL LOW IS CENTERED NEAR 21N140W. UPPER LEVEL 
DIFFLUENCE E OF THE CENTER IS PRODUCING SCATTERED TO BROKEN HIGH 
CLOUD FROM 20N-25N BETWEEN 127W-131W. AN UPPER LEVEL HIGH IS 
CENTERED NEAR 15N115W. ANOTHER UPPER LEVEL HIGH IS CENTERED N OF 
THE GULF OF TEHUANTEPEC AT 17N96W. THIS SYSTEM IS PRODUCING NE 
SHEAR OVER THE SURFACE LOW AT 13N94W PRODUCING AN UNFAVORABLE 
ENVIRONMENT ALOFT AND PRECLUDES ANY SIGNIFICANT TROPICAL 
ORGANIZATION. 

...AT THE SURFACE...
A 1010 MB LOW IS EMBEDDED ON THE ITCZ S OF THE GULF OF 
TEHUANTEPEC AT 13N94W. ISOLATED MODERATE CONVECTION IS FROM 09N 
TO 13N BETWEEN 91W AND 97W. A SURFACE TROUGH IS EMBEDDED ON THE 
ITCZ ALONG 14N103W 08N106W. A 1010 MB LOW IS ALSO EMBEDDED ON 
THE ITCZ AT 06N139W. ISOLATED MODERATE CONVECTION IS FROM 04N TO 
08N BETWEEN 133W AND 138W. ELSEWHERE...A 1027 MB HIGH IS 
CENTERED NW OF THE AREA AT 31N143W. A RIDGE AXIS EXTENDS E FROM 
THE HIGH TO N BAJA CALIFORNIA AT 32N117W. A TIGHT SURFACE 
PRESSURE GRADIENT EXITS ALONG THE COAST OF S CALIFORNIA AND THE 
N BAJA CALIFORNIA WHERE A GALE IS DEVELOPING WITHIN 24 HOURS. 
10-13 FT NW SEA SWELL IS ALSO MOVING S ALONG THE W BAJA 
CALIFORNIA COAST. FRESH NE TRADES ARE ALSO FROM 08N TO 21N W OF 
128W.

LARGE CROSS-EQUATORIAL SW LONG PERIOD SWELL HAS SEAS TO 8 FT S 
OF 08N W OF 95W. THE SWELL WILL SUBSIDE BY THE END OF THE 
FORECAST PERIOD AS IT SPREADS NORTHWARD.

$$
FORMOSA