000
AXPZ20 KNHC 120902
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC SAT JAN 12 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...4N77W 5N100W 8N120W 6N140W. 
SCATTERED MODERATE TO STRONG CONVECTION FROM 6N-11W BETWEEN 
110W-114W. 

...DISCUSSION...
MID/UPPER TROUGH EXTENDS FROM NW MEXICO SW TO 20N116W TO A VERY 
PRONOUNCED STATIONARY MID/UPPER LEVEL CYCLONIC CIRCULATION NEAR 
14N131W. MID/UPPER LEVEL RIDGING IS PRESENT N OF BOTH THE TROUGH 
AND CYCLONIC CIRCULATION. THE COMBINATION OF THESE FEATURES IS 
RESULTING IN MODERATE SUBSIDENCE AND ASSOCIATED DRY AIR S OF 25N 
W OF 130W. DIVERGENT FLOW E OF THE CYCLONIC CIRCULATION 
CONTINUES TO PRODUCE AN AREA OF OVERCAST MULTILAYERED CLOUDS 
WITH SCATTERED SHOWERS N OF THE ITCZ TO 17N BETWEEN 1228 AND 
128W. AN UPPER LEVEL TROUGH EXTENDS FROM  12N104W TO 3N84W.
MODERATE TO STRONG SUBSIDENCE SURROUNDING THE TROUGH IS 
INHIBITING AND SIGNIFICANT CONVECTION FROM DEVELOPING E OF 110W 
INCLUDING ALONG THE ITCZ. UPPER LEVEL RIDGING EXTENDS NW FROM S 
AMERICA TO ACROSS CENTRAL AMERICA AND SE MEXICO...ALSO KEEPING 
CONVECTION THERE TO A MINIMUM.

SURFACE RIDGE FROM 32N135W TO 13N114W. ANTICYCLONIC FLOW COVERS
THE AREA N OF 13N W OF 110W IS BRINGING BRISK ELY WINDS W OF 
120W.

DGS