000
AXPZ20 KNHC 241600
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC SAT MAY 24 2008

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 
1530 UTC.

...TROPICAL WAVES...
TROPICAL WAVE N OF 03N ALONG 85W REMAINS NEARLY STATIONARY. THE 
WAVE REMAINS DIFFICULT TO TRACK IN THE FACE OF A LARGE SWATH OF 
WESTERLY SURFACE WINDS. CONVECTION IS FOCUSED WEST OF THE WAVE 
AXIS WITHIN 240 NM EITHER SIDE OF THE ITCZ...SEE NEXT PARAGRAPH.
 
...ITCZ...
INTERTROPICAL CONVERGENCE ZONE IS ALONG THE LINE...08N78W TO 
05N95W TO 11N118W TO 07N130W TO 05N140W. SCATTERED MODERATE 
ISOLATED STRONG WITHIN 240 NM EITHER SIDE OF AXIS BETWEEN 87W 
AND 92W...WITHIN 240 NM S OF THE AXIS BETWEEN 92W AND 100W AND 
FROM 08N TO 13N BETWEEN 120W AND 128W. 

...DISCUSSION...
AREA N OF 20N REMAINS COVERED BY THE SRN PERIPHERY OF A LARGE 
CYCLONIC CIRCULATION CENTERED OVER NORTHERN CALIFORNIA AND 
WESTERN NEVADA. THE MIDDLE LEVEL TROUGH EXTENDS THROUGH 32N119W
TO 20N126W. ANOTHER SHORTWAVE TROUGH ROTATING DOWN THE BACKSIDE 
OF THE CIRCULATION IS EXPECTED TO SWEEP ACROSS THE NE PORTION OF 
THE AREA WITHIN 24 HOURS AND KEEP A BROAD CYCLONIC PATTERN IN 
PLACE. OVER THE DEEP TROPICS AN ELONGATED ANTICYCLONE EXTENDS 
FROM 18N102W TO 12N115W AND DOMINATED THE FLOW S OF 20N BETWEEN 
90W AND 135W. A LARGE AREA OF MODERATE TO STRONG UPPER LEVEL 
SUBSIDENCE IS BETWEEN THE ANTICYCLONE AND THE TROUGH...GENERALLY
OVER MEXICAN THE PACIFIC E OF 130W FROM 15N TO 30N. BROKEN TO 
OVERCAST STRATOCUMULUS ARE NOTED IN THE LOWER LEVELS. 

TROPICAL UPPER LEVEL CYCLONIC CIRCULATION OVER PANAMA WAS MOVING 
W 10-15 KT AND S OF A MID TO UPPER LEVEL RIDGE ALONG 20N. 
DIFLUENT NORTHEASTERLY FLOW ALOFT TO THE W OF THE CIRCULATION WAS
ENHANCING CONVECTION TO THE WEST OF THE TROPICAL WAVE AXIS ALONG 
85W AND ELSEWHERE OVER THE PACIFIC WITHIN 240 NM OF THE ITCZ AND 
E OF 110W. 

AT THE SURFACE...WEAK HIGH PRESSURE WELL NW OF THE AREA 
INFLUENCING THE AREA N OF 15N W OF 125W. BROAD LOW LEVEL 
WESTERLY FLOW INDICATED ELSEWHERE E OF 110W.  

$$
COBB