000
AXPZ20 KNHC 311521
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC MON MAY 31 2010

TROPICAL WEATHER DISCUSSION FOR THE EASTERN PACIFIC OCEAN FROM 
THE EQUATOR TO 32N...EAST OF 140W. 

BASED ON 1200 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
1500 UTC.

...ITCZ...
AXIS IS ALONG 11N86W TO 11.5N89W TO 07N109W TO 09.5N116W TO 06N127W 
TO 06N140W. SCATTERED MODERATE ISOLATED STRONG CONVECTION WITHIN 60 
NM EITHER SIDE OF AXIS BETWEEN 88W AND 106W. SCATTERED MODERATE TO 
STRONG CONVECTION WITHIN 120 NM N OF AXIS BETWEEN 111W AND 116W. 

...DISCUSSION...
AN UPPER LEVEL TROUGH DOMINATES THE NORTHERN PORTION OF THE 
DISCUSSION AREA N OF 22N. THE SUBTROPICAL JET IS SOUTH OF THIS 
TROUGH...ENTERING THE AREA NEAR 18N140W EXTENDING NE TO 20N135W THE 
E TO CENTRAL MEXICO. MAX WIND SPEEDS IN THE JET REACH 90 KT ALONG 
20N BETWEEN 120 AND 130W 

IN THE DEEP TROPICS AN UPPER LEVEL ANTICYCLONIC CIRCULATION IS 
CENTERED NEAR 12N125W. A RIDGE EXTENDS FROM THIS ANTICYCLONE WSW TO 
11N140W AND E TO CENTRAL AMERICA. 

HIGH PRESSURE 1027 MB CENTERED NEAR 28.5N146W HAS SURFACE RIDGE 
EXTENDING SE TO 16N113W. A SMALL AREA OF NE TO E TRADES OF 20 KT 
REMAINS FROM 08N TO 21N W OF 135W. THIS AREA OF 20 KT TRADES WILL 
DIMINISH OVER THE NEXT 48 HOURS. CROSS EQUATORIAL SOUTHERLY SWELL OF 
UP TO 10 FT IS PROPAGATING THROUGH THE AREA S OF 15N W OF 104W...AND 
S OF 10N BETWEEN 92W AND 104W. 

SURFACE LOW PRESSURE 1011 MB IS CENTERED NEAR 10N117W WITH SCATTERED 
MODERATE TO STRONG CONVECTION WITHIN 90 NM N...W...AND E QUADRANTS 
AND 180 NM S QUADRANT. THIS LOW WILL REMAIN NEARLY STATIONARY OVER 
THE NEXT 48 HOURS.

$$
AL