000
AXPZ20 KNHC 050954
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC WED DEC 05 2007

TROPICAL WEATHER DISCUSSION FOR THE EASTERN PACIFIC OCEAN
FROM THE EQUATOR TO 32N...EAST OF 140W. 

BASED ON 0000 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0200 UTC.
 
...ITCZ...
INTERTROPICAL CONVERGENCE ZONE IS ALONG THE LINE...8N77W 9N108W 
8N115W 6N140W. SCATTERED MODERATE WITHIN 120-150 NM OF THE AXIS 
BETWEEN 108W AND 111W...AND WITHIN 90 NM OF THE AXIS BETWEEN 
117W AND 125W. 

...DISCUSSION...

MID/UPPER LEVEL RIDGE AXIS IS OVER THE NW PORTION OF THE AREA 
WITH THE AXIS THROUGH 32N128W TO 25N140W AND WAS BECOMING LESS 
DISTINCT ION THE FACE OF A LARGER RIDGE AXIS NW OF THE AREA 
THROUGH 35N140W TO 20N150W. A NARROW UPPER LEVEL TROUGH AXIS 
EXTENDS FROM AN UPPER LOW OFF THE COAST OF THE BAJA PENINSULA 
NEAR 27N118W TO A SECOND UPPER LOW NEAR 23N135W ALONG 20N134W TO 
A THIRD UPPER LOW NEAR 12N134W. AN UPPER LEVEL HIGH IS SE OF THE 
THIS UPPER TROUGH NEAR 21N125W DOMINATING THE AREA FROM 10N-24N 
BETWEEN 110W-130W. 

FURTHER E...ANOTHER UPPER LOW WAS NOTED OVER MEXICO NEAR 21N104W
AND WAS TRAPPED BENEATH A MID TO UPPER LEVEL HIGH NEAR 30N105W. 
MODERATE SWLY FLOW AT THE MID AND UPPER LEVEL S WAS NOTED E OF 
THE UPPER LOW OVER MEXICO AND GENERALLY OVER THE TROPICAL 
PACIFIC E OF 100W. 

AT THE SURFACE...A WARM FRONT WAS OVER THE EXTREME NW PART OF 
THE AREA FROM 32N135W TO BEYOND 29N140W. FRONT WAS RATHER
ILL-DEFINED WITH ONLY ISOLATED SHOWERS ALONG AND N OF THE 
FRONTAL BOUNDARY. A WEAK SURFACE TROUGH WAS NOTED OVER THE DEEP 
TROPICS FROM 14N105W TO 5N100W. RIDGE COVERS THE REMAINDER OF 
THE AREA BETWEEN THE FRONT AND 15N W OF 110W AND WAS ANCHORED BY 
A 1028 MB HIGH NEAR 31N127W. 

A 0024 UTC QUIKSCAT PASS INDICATED GAP WINDS OF 20 TO 25 KT IN 
THE GULF OF TEHUANTEPEC AREA. THESE WINDS ARE FORECAST TO DROP 
TO LESS THAN 20 KT WITHIN THE NEXT 12 HOURS. 

LARGE NORTHWEST SWELLS OF UP TO 18-20 FT OBSERVED OVER THE 
NORTHERN PART OF THE AREA WILL SPREAD SE AND DIMINISH THROUGH 48 
HOURS AND IMPACT MOST OF THE AREA NORTH OF THE EQUATOR AND WEST 
OF 110W. 

$$
COBB