000
AXPZ20 KNHC 142157
TWDEP 

TROPICAL WEATHER DISCUSSION    
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
2205 UTC SAT MAR 14 2009

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

BASED ON 1800 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
2100 UTC.

...ITCZ...
AXIS ALONG FROM 08N83W TO 04N98W THEN FROM 05N118W TO 04N130W TO 
04N140W.  NO SIGNIFICANT CONVECTION.

...DISCUSSION...
BROAD STATIONARY MID/UPPER LEVEL RIDGE WITH AXIS ALONG 132W IS 
ADVECTING ABUNDANT TROPICAL MOISTURE N OF 12.  DOWNSTREAM LARGE 
AMPLITUDE UPPER LEVEL TROUGH PICKS MOISTURE AND BRINGS IT ACROSS 
MEXICO INTO NW GULF OF MEXICO FEEDING COLD FRONT WITH CONVECTION 
AND MULTILEVEL OVERCAST SKIES.  WEAK SURFACE TROUGH ALONG 125W 
FROM 10N-13N PICKS SOME MOISTURE FOR SCATTERED CONVECTION E OF 
ITS AXIS.  ELSEWHERE AIR MASS REMAINS VERY DRY S OF 20N AS 
CONVERGING WINDS ALOFT FORCE MODERATE TO STRONG SUBSIDENCE E  
OF 115W.  LARGE STATIONARY RIDGE OVER SOUTH AMERICA COMPLETES 
UPPER LEVEL PICTURE EXTENDING DRY AREA WELL INTO CARIBBEAN AND 
TROPICAL ATLC. 

ELSEWHERE AT THE SURFACE...
REINFORCED HIGH PRES CENTER 1028 MB AT 30N132W HOLDS ITS GROUND 
FORCING GALE CENTER FURTHER W AWAY FROM WRN E PAC BOUNDARY.  
WINDS W OF 130W DIMINISH AND NW SWELLS SUBSIDE AS GALE CENTER 
WEAKENS WELL W OF BASIN.  

ATLC HIGH PRES WHICH WAS CAUSING GULFS OF PAPAGAYO AND PANAMA 
GAP WINDS IS WEAKENING AND BEING FORCED E BY COLD FRONT OFF 
CONUS E COAST...DIMINISHING CARIBBEAN TRADE WINDS...HENCE GAP 
WINDS.

$$
WALLY BARNES