000
AXPZ20 KNHC 140929
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC SUN DEC 14 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 
0830 UTC.

...ITCZ...

THE INTERTROPICAL CONVERGENCE ZONE...IS ALONG THE LINE 06N77W TO 
07N90W TO 7N117W TO 09N126W TO 8N140W. SCATTERED MODERATE/ 
ISOLATED STRONG CONVECTION IS WITHIN 60 NM OF 08N113W. SIMILAR 
CONVECTION IS ALSO WITHIN 90 NM OF 09N119W.

...DISCUSSION...

THE GAP WINDS...
NORTHEASTERLY WINDS ARE BLOWING OVER THE GULF OF PAPAGAYO AND 
DOWNSTREAM OUT TO 95W WITH SPEEDS OF 20 TO 25 KT. SEAS ARE UP 
TO 10 FT. THE WINDS ARE EXPECTED TO DIMINISH TO LESS THAN 20 KT 
LATE SUNDAY BUT RETURN BY MONDAY AND CONTINUE THROUGH MIDDAY 
TUESDAY.

ELSEWHERE...
DEEP LAYERED UPPER ANTICYCLONE IS CENTERED WEST OF THE NORTHWEST 
PART OF THE AREA NEAR 27N150W. THE ASSOCIATED CIRCULATION 
AFFECTS THE NORTHWEST PART OF THE AREA N OF 25N AND W OF 130W. 
DRY AIR IN SUBSIDENCE COVERS THE AREA WITH OVERCAST LOW LEVEL 
STRATOCUMULUS CLOUDS OBSERVED ON SATELLITE IMAGERY.

OTHERWISE LARGE SCALE DEEP LAYER TROUGH IS OVER THE AREA 
NORTHWEST OF A LINE FROM 32N105W TO 15N135W. THE AREA WEST OF 
THIS LINE IS DRY AIR IN SUBSIDENCE AND CLOUD FREE IN THE MIDDLE 
AND UPPER LEVELS WITH OVERCAST TO BROKEN STRATOCUMULUS NORTH OF 
17N AND BROKEN TO SCATTERED STRATOCUMULUS SOUTH OF 17N IN THE 
LOWER LEVELS. A LARGE PLUME OF UPPER LEVEL MOISTURE AND BROKEN 
MULTILAYERED CLOUDINESS EXTENDS NEARLY 700 NM SOUTHEAST OF THE 
LINE. THIS MOISTURE IS ADVECTING OVER MEXICO MAINLY NORTH OF 
20N. THE GREATEST AREA OF UPPER DIFFLUENCE WITHIN WEAK UPPER 
TROUGHING BETWEEN 110W-130W IS ENHANCING THE CONVECTION AREAS 
ASSOCIATED WITH THE ITCZ.

REMAINDER OF THE AREA IS UNDER BROAD WEAK ANTICYCLONIC FLOW. 
EXCEPT FOR SOME ITCZ CONVECTION THE AREA SOUTHEAST OF THE LINE 
FROM 22N97W TO 14N110W TO THE EQUATOR NEAR 110W IS VOID OF ANY 
DEEP CLOUDINESS IN THE MIDDLE AND UPPER LEVELS. BROKEN 
STRATOCUMULUS IS OBSERVED SOUTH OF THE ITCZ FROM 90W TO 125W.

$$
HUFFMAN