000
AXPZ20 KNHC 211523
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS NATIONAL HURRICANE CENTER MIAMI FL 
1605 UTC SAT SEP 21 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 1200 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
1500 UTC.

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

MONSOON TROUGH FROM 16N95W TO 11N100W TO 12N133W. ITCZ 12N133W 
TO 11N140W. NO SIGNIFICANT CONVECTION. 

...DISCUSSION...

AN UPPER LEVEL TROUGH HAS MOVED INTO THE FAR NW PORTION OF THE 
DISCUSSION AREA WITH AXIS FROM 32N131W TO 28N140W. ASSOCIATED 
EARLY SEASON COLD FRONT EXTENDS FROM 32N125W TO 26N140W. NO 
SIGNIFICANT WEATHER ASSOCIATED WITH THE FRONT. OTHERWISE A BROAD 
UPPER LEVEL ANTICYCLONIC CIRCULATION DOMINATES THE REMAINDER OF 
THE DISCUSSION AREA. THE ANTICYCLONE IS CENTERED NEAR 23N116W 
WITH A RIDGE EXTENDING NE INTO NW MEXICO AND ANOTHER RIDGE 
EXTENDING W OF THE ANTICYCLONE TO 16N140W. STRONG SUBSIDENCE 
WITH DRY AND STABLE AIR AT THE MIDDLE AND UPPER LEVELS IS N OF 
13N W OF 110W.

NW SWELL TO 8 FT IN THE NW PORTION OF THE AREA N OF 28N W OF 
133W WILL SHIFT E MON TO N OF 28N BETWEEN 118W-123W. AN AREA OF 
SW WINDS 20 KT AND SEAS TO 8 FT ARE FORECAST FROM 6N-9N BETWEEN 
96W-103W THIS EVENING.

FAIRLY BENIGN MARINE CONDITIONS PREVAIL ELSEWHERE ACROSS THE 
AREA.
 
$$
DGS