000
AXPZ20 KNHC 230909
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC SAT DEC 22 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 9N85W 5N120W 
10N140W. SCATTERED MODERATE TO STRONG CONVECTION WITHIN 120 NM N 
OF AXIS FROM 125W-135W.

...DISCUSSION...
UPPER LEVEL ANTICYCLONIC CIRCULATION IN THE DEEP TROPICS IS 
CENTERED NEAR 9N128W...WITH RIDGE NW TO 27N140W. UPPER LEVEL
DIFFLUENCE ASSOCIATED WITH THE ANTICYCLONE IS ENHANCING 
CONVECTIVE ACTIVITY ALONG THE ITCZ W OF 125W. BROAD MID/UPPER 
LEVEL TROUGH TO NE AND E OF THE RIDGE/ANTICYCLONE WITH MAIN 
TROUGH AXIS FROM NORTHERN BAJA CALIFORNIA NEAR 32N115W TO 
5N110W. A SHORTWAVE IS MOVING INTO THE FAR N PORTION OF THE 
DISCUSSION AREA FROM 32N124W TO 30N135W. SW UPPER LEVEL WINDS E 
OF THE TROUGH AXIS ARE ADVECTING MID/HIGH CLOUDS ACROSS CENTRAL 
MEXICO. MODERATE TO STRONG SUBSIDENCE WITH DRY AIR AT THE MID TO 
UPPER LEVELS OF THE ATMOSPHERE IS SE OF A LINE FROM EASTERN 
MEXICO NEAR TAMPICO TO EQUATOR AT 115W. THIS DRY AIR IS LIMITING 
CONVECTIVE ACTIVITY ALONG THE ITCZ ACROSS THE E PORTION OF THE 
AREA.

SURFACE RIDGE IS N OF THE ITCZ W OF 115W. WEAK TROUGH IS 
ANALYZED FROM SE ARIZONA ACROSS NW MEXICO INTO THE GULF OF 
CALIFORNIA NEAR 24N108W.

LARGE AREA OF OVERCAST STRATOCUMULUS IS N OF 14N W OF 120W.

HIGH PRES BUILDING W OF A COLD FRONT MOVING ACROSS THE WESTERN 
GULF OF MEXICO WILL INCREASE THE WINDS TO GALE FORCE IN THE GULF 
OF TEHUANTEPEC LATER TODAY.

$$
DGS