000
AXPZ20 KNHC 291557
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC MON DEC 29 2008

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

BASED ON 1200 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
1515 UTC.

...ITCZ...

ITCZ AXIS IS CENTERED ALONG 06N77W TO 07N90W TO 06N110W TO 
09N130W TO 10N140W. SCATTERED MODERATE CONVECTION IS LOCATED 
WITHIN 45 NM EITHER SIDE OF A LINE FROM 06N90W TO 07N93W AND 
ALSO WITHIN A 60 NM RADIUS OF 07N137W. 

...DISCUSSION...

W OF 100W...
A LARGE MIDDLE/UPPER LEVEL TROUGH COVERS THE AREA N OF 15N E OF 
130W INTO MEXICO. THE AXIS OF THE TROUGH IS LOCATED ALONG 120W 
WITH WATER VAPOR IMAGERY INDICATING A LARGE AREA OF SUBSIDENCE N 
OF 20N BETWEEN BAJA CALIFORNIA AND 125W. SATELLITE DERIVED WINDS 
SHOW AN AREA OF DIFFLUENCE N OF 25N W OF 130W. A WESTERLY JET 
ALOFT CUTS THROUGH THE DISCUSSION AREA EXTENDING THROUGH 23N140W 
TO 15N120W AND ACROSS THE MEXICAN COAST AT 24N. WIND SPEEDS ARE 
UNIFORM ALONG THE JET AND ARE IN THE 60 TO 70 KT RANGE. ANOTHER 
AREA OF DIFFLUENCE ALOFT IS LOCATED ROUGHLY FROM 10N TO 15N 
BETWEEN 110W AND 118W. AT THE SURFACE SEAS AS HIGH AS 14 FT ARE 
LOCATED FROM 10N TO 22N W OF 120W. ALSO A 1028 MB SURFACE HIGH 
IS LOCATED IN THE VICINITY OF 32N129W.

E OF 100W...
VERY STRONG SUBSIDENCE ALOFT IS LOCATED OVER THE AREA E OF 105W. 
AT THE SURFACE A GALE IS FORECAST TO BEGIN OVER THE GULF OF 
TEHUANTEPEC WITHIN 12 HOURS. THE EVENT IS EXPECTED TO LAST ABOUT 
24 HOURS.

$$
CAB