000
AXPZ20 KNHC 270954
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC THU DEC 27 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 
0945 UTC.
 
...ITCZ...
INTERTROPICAL CONVERGENCE ZONE AXIS ALONG 8N77W 6N90W 8N110W 
8N140W. SCATTERED MODERATE CONVECTION IS OBSERVED WITHIN 60 NM 
OF 6N86W. 

...DISCUSSION...
A LONGWAVE TROUGH DOMINATES WESTERN N AMERICA WITH AN ASSOCIATED 
SHORT WAVE TROUGH EXTENDING S INTO THE REGION ALONG 118W TO A 
BASE NEAR 22N118W. A SHORTWAVE RIDGE IS SPILLING SE OVER THE NW 
PORTION OF THE DISCUSSION AREA ALONG 29N145W 37N135W. DRY UPPER 
AIR IS NOTED OVER THE AREA TO THE N OF LINE 23N106W 21N118W 
26N140W. 

FURTHER S...ANOTHER UPPER RIDGE EXTENDS E INTO THE AREA WITH ITS 
CREST ROUGHLY ALONG 22N140W 10N130W. UPPER MOISTURE IS ADVECTED 
E UNDER THIS RIDGE WITH SOME MOISTURE CONTINUING E OVER THE AREA 
FROM 16N TO 23N BETWEEN 133W AND 120W. 

A TROPICAL ANTICYCLONE NEAR 3N104W HAS A RIDGE EXTENDING N 
ACROSS OLD MEXICO ALONG 22N. SCATTERED MODERATE ISOLATED STRONG 
CONVECTION IS ENHANCED WITHIN 15 NM EITHER SIDE OF LINE 11N111W 
12N118W. THE DEBRIS MOISTURE FROM THIS CONVECTION CONTINUES NE 
IN A TROPICAL PLUME NOTED WITHIN 240 NM EITHER SIDE OF LINE 
16N110W 21N97W ACROSS THE GULF OF MEXICO AND OVER THE SE CONUS.
 
AT THE LOW LEVELS A SURFACE RIDGE EXTENDS ALONG 30N128W 18N115W 
12N100W SUPPORTING 20-30 KT TRADE WINDS S OF THE RIDGE.

GAP WINDS TO ABOUT 20 KNOTS WILL CONTINUE FOR ANOTHER DAY OR SO 
THROUGH IN AND DOWNSTREAM OF THE GULF OF PAPAGAYO. EXTENDED 
OUTLOOK...APPEARS A MAJOR WIND EVENT IS SETTING UP FOR THE GULF 
OF TEHUANTEPEC GAP IN THE WAKE OF A STRONG COLD FRONT IN THE 
GULF OF MEXICO TUE EVENING.

NORTHWEST WINDS IN THE GULF OF CALIFORNIA WILL FLUCTUATE AROUND 
20 KT DURING THE NEXT 48 HOURS.

$$
NELSON