000
AXPZ20 KNHC 202152
TWDEP 

TROPICAL WEATHER DISCUSSION     
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
2205 UTC WED DEC 20 2006

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 
2045 UTC.

...ITCZ...

AXIS ALONG 5N77W 6N84W 4N97W 7N115W 8N140W.  MODERATE CONVECTION 
WITHIN 90 NM N AND 180 NM S OF THE AXIS BETWEEN 77W AND 81W. 
ISOLATED CONVECTION ALSO IS FOUND WITHIN 120 NM OF THE AXIS 
BETWEEN 118W AND 140W. SCATTERED MODERATE CONVECTION IS 
OCCURRING IN ASSOCIATION WITH A SURFACE TROUGH FROM 11N TO 15N 
BETWEEN 112W AND 117W. 

...DISCUSSION...
UPPER LEVELS... AN UPPER TROUGH EXTENDS FROM  32118W TO 17N140W. 
AN UPPER RIDGE EXTENDS ALONG 10N W OF 140W. STRONG SW TO W WINDS 
ARE BETWEEN THE TWO FEATURES BRINGING EXTENSIVE TROPICAL MOISTU 
RE TO N. AMERICA. A TROUGH EXTENDS FROM 12N85W TO 5N90W.

LOW LEVELS...A RIDGE ALONG 30N AND IS DRIVING NE WINDS UP TO 25 
KT AND SEAS 10 TO 12 FT BETWEEN 10 AND 20N W OF 110W.   ONLY 
WEAK GAP FLOW EVENTS ARE OCCURRING ALONG THE GULF OF TEHUANTEPEC 
AND GULF OF PAPAGAYO...PRODUCING LESS THAN 8 FT SEAS...AND THESE 
ARE EXPECTED TO CEASE WITHIN THE NEXT DAY OR SO AS THE MODERATE 
PRESSURE GRADIENT WEAKENS IN THE AREA.  THE NEXT EVENT OF 
SIGNIFICANCE WILL BE A COLD FRONT PUSHING INTO THE NW CORNER OF 
THE REGION WITH RAPIDLY BUILDING NW SWELL ON THU AND FRI.  IN 
THE TROPICS...THE SURFACE TROUGH NEAR 12N115W HAS PERSISTED WITH 
MODERATE CONVECTION

$$
TORREA