000
AXPZ20 KNHC 080321
TWDEP 

TROPICAL WEATHER DISCUSSION   
NWS NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC SUN MAY 08 2011

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

BASED ON 0000 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0245 UTC.

...ITCZ...

THE INTERTROPICAL CONVERGENCE ZONE AXIS IS ALONG 09N84W TO 
08N106W TO 06.5N114W TO 07.5N122W TO 06N140W WITH SCATTERED 
MODERATE ISOLATED STRONG CONVECTION NOTED WITHIN 180 NM S OF 
AXIS BETWEEN 88W AND 100W.

...DISCUSSION...

SURFACE HIGH PRESSURE 1029 MB IS CENTERED NEAR 36N152W WITH 
SURFACE RIDGE EXTENDING SE TO NEAR 20N110W. THE PRESSURE 
GRADIENT BETWEEN THE SURFACE RIDGE AND LOWER PRESSURE NEAR THE 
ITCZ IS MAINTAINING A SMALL AREA OF FRESH 20 KT TRADE WINDS AND 
8 FT SEAS FROM 08N TO 13N W OF 131W. THROUGH THE RIDGE WILL 
REMAIN ACROSS THE SAME GENERAL AREA OVER THE NEXT COUPLE OF 
DAYS...PRESSURES WILL RISE SLIGHTLY NEAR THE ITCZ WHICH WILL 
WEAKEN THE PRESSURE GRADIENT ENOUGH TO DIMINISH TRADE WINDS 
BELOW 20 KT BY MONDAY AFTERNOON.

THE PRESSURE GRADIENT BETWEEN THE RIDGE AND A SURFACE TROUGH 
OVER MEXICO IS SUPPORTING FRESH 20 KT NW WINDS OFF THE W COAST 
OF BAJA CALIFORNIA. THE TROUGHING WILL REMAIN OVER MEXICO...AND 
THE RIDGE WILL REMAIN OVER THE SAME GENERAL AREA...MAINTAINING 
THE PRESSURE GRADIENT WHICH WILL SUPPORT THE FRESH 20 KT NW 
THROUGH THE FORECAST PERIOD. 

WINDS WILL CONTINUE TO PULSE OVER THE GULF OF PAPAGAYO THROUGH 
MONDAY MORNING...TO 20 KT DURING THE LATE NIGHT AND EARLY 
MORNING HOURS WITH THE AID OF NOCTURNAL DRAINAGE FLOW...AND 
BELOW 20 KT DURING THE DAYTIME HOURS.  

$$
AL