000
AXPZ20 KNHC 040921
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC THU DEC 04 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...

THE INTERTROPICAL CONVERGENCE ZONE IS CENTERED ALONG THE LINE... 
07N78W TO 06N105W TO 08N140W. SCATTERED MODERATE CONVECTION IS 
WITHIN 60 NM OF THE POINTS 06N94.5W AND 08N98W. SCATTERED  
MODERATE WITH ISOLATED STRONG CONVECTION IS WITHIN 45 NM OF THE 
POINT 07.5N133W.

...DISCUSSION...

DEEP LAYER TROUGH IS OVER MEXICO NORTH OF 25N. THE AREA IS DRY 
AND CLOUD FREE. THE TROUGH IS FORECAST TO MOVE EAST AND BE 
ABSORBED IN THE WESTERLIES BY TONIGHT.

ANOTHER DEEP LAYER TROUGH IS MOSTLY JUST WEST OF 140W. THIS 
FEATURE IS FORECAST TO DRIFT A LITTLE EAST AND MAINTAIN ITS 
STRENGTH OR INTENSIFY AS A SHORTWAVE TROUGH DROPS SOUTHWEST 
FROM NORTH OF THE AREA AND SETS UP A LARGE CYCLONIC CIRCULATION 
OVER THE NORTHWEST PART OF THE AREA FRIDAY. WITHIN THE TROUGH 
THE MIDDLE AND UPPER LEVELS ARE DRY BUT THE SOUTHERLY FLOW OVER 
THE AREA EAST OF 140W IS MOIST ALOFT WITH A LARGE AREA OF 
CLOUDINESS WEST OF 125W.

OUTSIDE OF THE ABOVE TWO TROUGHS THE MIDDLE AND UPPER LEVELS IS 
DOMINATED BY BROAD ANTICYCLONIC FLOW.

MODERATE SURFACE RIDGE IS NORTH OF 15N WEST OF 110W. ELSEWHERE A 
BROAD TROUGH IS ANALYZED AT THE SURFACE.

GAP WINDS ARE ONGOING IN THE GULF OF PAPAGAYO REGION AND ARE 
FORECAST TO CONTINUE THROUGH AT LEAST 48 HOURS.

GAP WINDS WILL BEGIN IN THE GULF OF TEHUANTEPEC LATE TODAY AND 
RAPIDLY INCREASE TO MINIMAL GALE TONIGHT.

$$
LL