000
AXPZ20 KNHC 181557
TWDEP 

TROPICAL WEATHER DISCUSSION  
NWS NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC TUE DEC 18 2012

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 1200 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
1500 UTC.

...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
MONSOON TROUGH 6N78W TO 8N85W 8N97W. ITCZ 8N97W TO 7N140W. 
SCATTERED MODERATE TO STRONG CONVECTION WITHIN 120 NM N AXIS 
FROM 131W TO 138W.

...DISCUSSION...
UPPER LEVEL TROUGH OVER THE FAR NW PORTION OF THE DISCUSSION 
AREA WITH AXIS FROM 32N133W TO 24N140W. A 70-110 JET STREAM IS 
SE OF THE TROUGH FROM 22N140W TO 32N125W. BROKEN TO OVERCAST MID 
AND UPPER LEVEL CLOUDS ARE WITHIN 620 NM SE OF THE JET. A BROAD 
UPPER LEVEL RIDGE IS E OF THE TROUGH TO MEXICO WITH AN UPPER 
LEVEL ANTICYCLONIC CIRCULATION CENTERED OFF THE COAST OF MEXICO 
NEAR 13N100W. WITH THE EXCEPTION OF A FEW SHOWERS FROM 6N-7N 
BETWEEN 107W-110W MODERATE TO STRONG SUBSIDENCE WITH DRY AND 
STABLE AIR AT THE MIDDLE AND UPPER LEVELS IS E OF 115W.

COLD FRONT EXTENDS FROM 32N121W TO 26N132W. A FEW LIGHT SHOWERS 
ARE ALONG THE FRONT. NLY WINDS 20-25 KT ARE W OF THE FRONT WITH 
SEAS TO 11 FT. LARGE MIXED NE AND NW SWELLS ARE FROM 5N-20N W OF 
115W.

$$
DGS