000
AXPZ20 KNHC 210907
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 6N78W 8N100W 
10N115W 8N140W. SCATTERED MODERATE ISOLATED STRONG CONVECTION 
WITHIN 75 NM S OF AXIS FROM 111W-115W AND 140 NM N OF AXIS FROM 
115W-119W.

...DISCUSSION...
MID/UPPER LEVEL RIDGE IS BUILDING ACROSS THE W PORTION OF THE
DISCUSSION AREA N OF 15N W OF 130W. UPPER LEVEL MOISTURE FROM
A CLUSTER TSTMS JUST E OF THE AREA IS MOVING INTO THE RIDGE
S OF 25N. MID/UPPER LEVEL TROUGH WITH LARGE CYCLONIC CIRCULATION
MOVING ACROSS NEVADA HAS AXIS FROM SOUTHERN CALIFORNIA TO 32N121W
TO 25N130W. A WEAK SHORTWAVE IS MOVING THROUGH THE MAIN TROUGH
AXIS NEAR 26N128W. SCATTERED/BROKEN MID AND HIGH CLOUDS ARE
BEING ADVECTED NE INTO BAJA CALIFORNIA AND NW MEXICO.

A BROAD RIDGE COVERS THE AREA E OF THE ABOVE MENTIONED TROUGH
WITH A MID LEVEL ANTICYCLONIC CIRCULATION OVER SOUTHERN MEXICO
NEAR 18N96W. THE RIDGE IS PRODUCING FAIRLY STRONG SUBSIDENCE 
OVER THE REGION S OF 20N E OF 105W. WITH THE STRONG SUBSIDENCE
IN PLACE VERY LITTLE TO NO CONVECTIVE ACTIVITY IS NOTED ALONG
THE ITCZ...AND SKIES ARE MOSTLY CLEAR N OF THE ITCZ.

THE TAIL END OF A COLD FRONT IS BRUSHING THE FAR N PORTION OF THE
AREA FROM 32N118W TO 30N123W. OTHERWISE SURFACE RIDGING COVERS 
THE AREA N OF 15N W OF 115W. BROKEN/OVERCAST STRATOCUMULUS CLOUDS
ARE WITHIN THE RIDGE. A WEAK 1014 MB SURFACE LOW IS LOCATED NEAR
18N107W.

$$
DGS