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Eastern Pacific Tropical Weather Discussion (Text)

000
AXPZ20 KNHC 210907
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC MON APR 21 2014

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 0600 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0900 UTC. 

...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...

MONSOON TROUGH FROM 10N85W TO 5N93W. ITCZ FROM 5N93W TO 4N105W 
TO 6N125W TO 5N140W. SCATTERED MODERATE ISOLATED STRONG 
CONVECTION FROM 5N-9N BETWEEN 120W-135W

...DISCUSSION...                                       

AN UPPER LEVEL TROUGH IS MOVING INTO THE FAR NW CORNER OF THE 
DISCUSSION AREA. OTHERWISE AN UPPER LEVEL RIDGE IS N OF 20N 
BETWEEN 115W-130W. STRONG SUBSIDENCE WITH DRY AND STABLE AIR AT 
THE MIDDLE AND UPPER LEVELS IS N OF 18N BETWEEN 110N-125W AND 
FROM 15N-25N W OF 125W. IN THE DEEP TROPICS AN UPPER LEVEL 
ANTICYCLONIC CIRCULATION IS CENTERED NEAR 5N133W. UPPER LEVEL 
DIFFLUENCE IS ENHANCING CONVECTION FROM 5N-9N BETWEEN 120W-135W. 
AN UPPER LEVEL TROUGH EXTENDS FROM EL SALVADOR S TO 8N87W.

A LARGE SURFACE RIDGE IS N OF 15N W OF 110W. THE PRES GRADIENT 
BETWEEN THE RIDGE AND THE ITCZ IS TIGHT ENOUGH FOR 15-20 KT 
TRADE WINDS AND SEAS TO 8 FT FROM 10N-20N W OF 125W. AN AREA OF 
LARGE NW SWELL IS NW OF A LINE FROM 3N119W TO 20N140W...WITH 
SEAS 8-10 FT.

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DGS