000
AXPZ20 KNHC 010921
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC MON DEC 01 2008

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

BASED ON 0600 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0900 UTC.

...ITCZ...
INTERTROPICAL CONVERGENCE ZONE IS ALONG THE LINE...05N77W TO 
06N120W TO 08N140W. SCATTERED MODERATE CONVECTION IS WITHIN 30 
NM EITHER SIDE OF THE AXIS WEST OF 135W.

...DISCUSSION...
DEEP LAYER TROUGH IS NORTH OF A LINE FROM 20N95W TO 17N105W TO 
19N120W TO 32N130W. THE AREA NORTH OF THE LINE IS DRY AND CLOUD 
FREE IN THE MIDDLE AND UPPER LEVELS INDICATING MODERATE TO 
STRONG MIDDLE AND UPPER LEVEL SUBSIDENCE. WEST OF 117W IN THIS 
AREA OVERCAST STRATOCUMULUS ARE OBSERVED IN THE LOWER LEVELS. 
THE TROUGH IS FORECAST TO WEAKEN THROUGH 48 HOURS.

REMAINDER OF THE MIDDLE AND UPPER LEVELS IS DOMINATED BY WEAK 
ANTICYCLONIC FLOW.

A MIDDLE AND UPPER LEVEL DRY AND CLOUD FREE AREA IS EAST OF A 
LINE FROM 20N90W TO 10N110W TO THE EQUATOR AT 110W. NORTH OF THE 
ITCZ THIS AREA IS ALSO CLOUD FREE IN THE LOWER LEVELS.

SOUTH OF THE ITCZ ACROSS THE ENTIRE AREA BROKEN TO OVERCAST 
STRATOCUMULUS ARE OBSERVED.

WEAK SURFACE RIDGE IS NORTH OF 13N WEST OF 112W. ELSEWHERE BROAD 
TROUGH IS ANALYZED AT THE SURFACE.

NORTHERLY WINDS IN THE GULF OF CALIFORNIA OF NEAR 20 KNOTS WILL 
DECREASE TODAY.

NORTHERLY WINDS OF 20 KNOTS IN THE GULF OF TEHUANTEPEC WILL 
BEGIN LATE TODAY AND BY TONIGHT INCREASE TO GALE FORCE.

$$
LL