000
AXPZ20 KNHC 221015
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC FRI DEC 21 2007

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 CENTERED ALONG 7N78W 9N105W 
8N125W 8N140W. SCATTERED MODERATE ISOLATED STRONG CONVECTION 
WITHIN 140 NM N OF AXIS FROM 113W-122W AND 90 NM N OF AXIS FROM 
127W-131W. NUMEROUS STRONG CONVECTION FROM 7N-11N BETWEEN 
135W-140W.

...DISCUSSION...
UPPER LEVEL RIDGE OVER THE W PORTION OF THE DISCUSSION AREA 
ROUGHLY ALONG 137W. UPPER LEVEL DIFFLUENCE ASSOCIATED WITH AN 
ANTICYCLONIC CIRCULATION NEAR 10N35W IS ENHANCING STRONG 
CONVECTION ALONG THE ITCZ W OF 135W. E OF THE UPPER RIDGE A 
MID/UPPER LEVEL TROUGH EXTENDS FROM SOUTHERN NEW MEXICO ACROSS
NW MEXICO THROUGH THE SOUTHERN BAJA PENINSULA TO 18N121W. 
MID/UPPER LEVEL RIDGE FROM THE GULF OF MEXICO TO THE YUCATAN
PENINSULA THEN ACROSS THE CARIBBEAN COAST OF CENTRAL AMERICA
TO AN UPPER LEVEL ANTICYCLONIC CIRCULATION OVER COLOMBIA. RATHER 
STRONG SUBSIDENCE ASSOCIATED WITH THE RIDGE HAS SUPPRESSED 
CONVECTIVE ACTIVITY ALONG THE ITCZ E OF 105W...WITH MOSTLY
FAIR SKIES ACROSS THE AREA E OF 105W N OF THE ITCZ.

SURFACE HIGH PRES RIDGE COVERS AREA THE AREA N OF 15N W OF 110W. 
BROKEN TO OVERCAST STRATOCUMULUS CLOUDS ARE WITHIN THE RIDGE
W OF 115W.

WINDS ARE EXPECTED TO PICK UP TO NEAR GALE FORCE BY LATE SUN 
OVER THE GULF OF TEHUANTEPEC DUE A COLD FRONT IN THE GULF OF 
MEXICO.

$$
DGS