000
AXPZ20 KNHC 201533
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC THU DEC 20 2007

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

BASED ON 1200 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
1500 UTC.
 
...ITCZ...

INTERTROPICAL CONVERGENCE ZONE ALONG 9N78W 10N100W 8N120W 
8N140W. SCATTERED MODERATE CONVECTION IS LOCATED WITHIN A 60 NM 
RADIUS OF 8.5N109W.

...DISCUSSION...

W OF 120W...
THE EASTERN PART OF A LARGE MIDDLE/UPPER LEVEL RIDGE IS LOCATED 
FROM ABOUT 5N TO 28N W OF 135W. THE RIDGE AXIS IS ALONG 145W AND 
MOVING E ABOUT 10 KNOTS. FURTHER EAST A MIDDLE/UPPER LEVEL 
TROUGH COVERS THE AREA N OF 18N BETWEEN 120W AND 135W WITH THE 
AXIS LOCATED ALONG 130W. WATER VAPOR IMAGERY DEPICTS A SMALL 
MIDDLE/UPPER LEVEL CYCLONIC VORTEX E OF THE TROUGH AXIS IN THE 
VICINITY OF 23.5N125W...MOVING NE ABOUT 10 KNOTS. STRONG 
WESTERLIES ALOFT LIE N OF 30N E OF 140W WITH SATELLITE CLOUD 
DRIFT WINDS INDICATING WIND SPEEDS UP TO 60 KNOTS.

E OF 120W...
A MIDDLE/UPPER LEVEL RIDGE IS LOCATED N OF 20N E OF 120W INTO 
WESTERN MEXICO. AN EAST-WEST ORIENTED RIDGE COVERS A LARGE PART 
OF THE DEEP TROPICS E OF 120W WITH THE AXIS LOCATED FROM NEAR 
WESTERN HONDURAS TO NEAR 12N120W.

$$
CAB