000
AXPZ20 KNHC 080916
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC SAT MAY 08 2010

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

BASED ON 0600 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0900 UTC.

...ITCZ...
AXIS ALONG AXIS ALONG 05N77W TO 04N87W TO 08N107W TO 05.5N122W 
TO 06N128W TO 04.5N140W. SCATTERED MODERATE ISOLATED STRONG 
CONVECTION WITHIN 120 NM N OF AXIS BETWEEN 105W AND 108W. 
SCATTERED MODERATE ISOLATED STRONG CONVECTION WITHIN 210 NM N OF 
AXIS BETWEEN 124W AND 127W. SCATTERED MODERATE ISOLATED STRONG 
CONVECTION WITHIN 150 NM OF AXIS W OF 130W.
 
...DISCUSSION...
IN THE UPPER LEVELS...
LARGE AMPLITUDE LONGWAVE TROUGH PREVAILS N OF 13N WITH AXIS 
ALONG 140W. A SHORT WAVE TROUGH IS RIDING NE NEAR 28N123W.  
SUBTROPICAL JET EXTENDS ACROSS THE AREA FROM 10N140W TO 21N127W 
TO NORTHERN BAJA CALIFORNIA...AND IS ADVECTING UPPER LEVEL 
MOISTURE FROM ITCZ CONVECTION TOWARD THE NORTHERN HALF OF BAJA 
CALIFORNIA. IN THE DEEP TROPICS...UPPER LEVEL ANTICYCLONE 
CENTERED NEAR 05N132W DUE TO ENHANCED ITCZ CONVECTION. BROAD 
ANTICYCLONE COVERS THE REMAINDER OF THE AREA E OF 114W.

...AT THE SURFACE...
HIGH PRES 1031 MB CENTERED WELL NW OF BASIN NEAR 38N152W HAS 
RIDGE EXTEND SE TO 18N109W. TIGHT PRESSURE GRADIENT BETWEEN THIS 
HIGH AND LOWER PRESSURES OF THE ITCZ...AND LOW PRESSURE OVER THE 
SW U.S. IS PRODUCING FRESH NE TRADES FROM 05N TO 29N W OF 
128W...AND FRESH NORTHERLY WINDS N OF 27N BETWEEN 117W AND 128W. 
AS THIS HIGH PRESSURE CENTER SHIFTS NE OVER THE NEXT 48 
HOURS...THE COVERAGE OF FRESH TRADES WILL INCREASE. 

NE SWELLS ARE PROPAGATING SW...AND ARE MIXING WITH CROSS 
EQUATORIAL SW SWELL OVER MOST OF THE WATERS E OF 125W.   

GAP WINDS...FRESH TO STRONG TRADES OVER THE SW CARIBBEAN ARE 
FUNNELING INTO THE GULF OF PAPAGAYO..AND WILL CONTINUE THROUGH 
THE REMAINDER OF THE FORECAST PERIOD. 

$$
AL