000
AXPZ20 KNHC 092150
TWDEP 

TROPICAL WEATHER DISCUSSION  
NWS NATIONAL HURRICANE CENTER MIAMI FL
2205 UTC FRI FEB 08 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 1800 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
2100 UTC.

...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
MONSOON TROUGH AXIS FROM 06N77W TO 03N83W TO 05N87W THEN FROM 
03N90W TO 05N104W TO 09N113W TO 08N119W THEN ITCZ AXIS TO 
04N132W TO 04N140W.  ISOLATED MODERATE CONVECTION WITHIN 120 NM 
N AND 180 NM S OF TROUGH FROM 85W TO 92W. 

...DISCUSSION...
UPPER LEVEL CYCLONE AT 41N112W HAS LONGWAVE TROUGH EXTEND TO 
BEYOND 26N140W FLATTENING CREST OF RIDGE THAT COVERS ALMOST 
ENTIRE BASIN W OF 110W.  THIS MAINTAINS STEADY ZONAL WINDS ALOFT 
N OF 10N W OF 110W ALONG WITH VERY DRY AND STABLE CONDITIONS.  
SHARP TROUGH EXTEND FROM GULF OF TEHUANTEPEC TO 00N100W 
INTRODUCING MODERATE DIVERGENT FLOW ALOFT E OF 95W WITH THE HELP 
OF ANTICYCLONE OVER COSTA RICA AND ALONG MONSOON TROUGH 
ENHANCING ISOLATED MODERATE CONVECTION FROM 85W TO 92W. 
OTHERWISE E PAC BASIN REMAINS FAIRLY DRY...STABLE AND CONVECTION 
FREE.   

...AT THE LOWER LEVELS...
SURFACE HIGH PRES CENTER N OF AREA AT 39N134W HAS RIDGE EXTEND 
TO 15N114W.  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 
FUNNELS 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