000
AXPZ20 KNHC 100337
TWDEP 

TROPICAL WEATHER DISCUSSION  
NWS NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC SUN FEB 10 2013

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.

...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
MONSOON TROUGH AXIS FROM 07N77W TO 04N83W TO 05N88W THEN FROM 
04N90W TO 05N107W TO 08N114W TO 06N121W THEN ITCZ AXIS TO BEYOND 
03N140W.  NO SIGNIFICANT CONVECTION. 

...DISCUSSION...
UPPER LEVEL CYCLONE AT 41N110W HAS LONGWAVE TROUGH EXTEND TO 
BEYOND 26N136W FLATTENING CREST OF RIDGE THAT COVERS ALMOST 
ENTIRE BASIN W OF 110W.  THIS MAINTAINS STEADY ZONAL WINDS ALOFT 
N OF 14N W OF 110W ALONG WITH VERY DRY AND STABLE CONDITIONS.  
SHARP TROUGH EXTEND FROM GULF OF TEHUANTEPEC TO 00N107W SPLITS 
FLAT CRESTED RIDGE FROM ANTICYCLONE OVER COSTA RICA AND ITS 
ATTENDANT RIDGE OVER SOUTH AMERICA.  E PAC BASIN REMAINS FAIRLY 
DRY...STABLE AND CONVECTION FREE.   

...AT THE LOWER LEVELS...
SURFACE HIGH PRES CENTER N OF AREA AT 40N134W HAS RIDGE EXTEND 
TO 15N106W.  MODERATE BREEZE REMAIN ACROSS TRADE WIND BELT BUT 
10-13 FT NW SWELL CONTINUE PROPAGATING S ACROSS E PAC W OF 110W 
...SUBSIDING TO 10-11 FT S OF 20N BY MON

FURTHER SOUTHEAST...TIGHT PRES GRADIENT OVER SW CARIBBEAN FUNNEL 
STRONG WINDS ACROSS MOUNTAIN GAPS IN NICARAGUA RESULTING IN 
STRONG BREEZE PULSES INTO THE GULF OF PAPAGAYO...INCREASING 
MAINLY LATE NIGHT AND EARLY MORNING AND DIMINISHING TO A FRESH 
BREEZE IN THE AFTERNOONS THROUGH MON.

$$
WALLY BARNES