000
AXPZ20 KNHC 160321
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC SUN DEC 16 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 
0300 UTC.
 
...ITCZ...
INTERTROPICAL CONVERGENCE ZONE AXIS IS CENTERED ALONG THE 
LINE...5N77W 11N110W 10N140W. SCATTERED MODERATE CONVECTION IS  
WITHIN 90 NM OF THE POINT 10.5N132.3W.

...DISCUSSION...
UPPER LEVELS...
MIDDLE AND UPPER LEVEL TROUGH IS NORTHWEST OF A LINE 25N100W TO 
10N140W.  THERE ARE TWO SHORTWAVES EMBEDDED IN THE LARGE TROUGH 
AREA. ONE IS OVER EAST MEXICO NORTH OF 25N AND IS MOVING RAPIDLY 
EAST. NORTHERN MEXICO IS DRY AND CLOUD FREE IN THE MIDDLE AND 
UPPER LEVELS.  THE OTHER SHORTWAVE IS OVER THE AREA FROM 15N TO 
25N WEST OF 122W.  THERE IS AN AREA OF MULTI LEVEL CLOUDS OVER 
THE OPEN OCEAN ASSOCIATED WITH THIS FEATURE FROM 23N TO 28N FROM 
116W TO 128W. ALSO A PLUME OF UPPER LEVEL MOISTURE AND BROKEN TO 
OVERCAST HIGH CLOUDS PRECEDES THE TROUGH AND EXTENDS ALONG THE 
LINE FROM THE ITCZ NEAR 125W TO 16N117W.

REMAINDER OF THE MIDDLE AND UPPER LEVELS ARE COVERED BY AN UPPER 
LEVEL ANTICYCLONIC FLOW.

SURFACE...
MODERATE RIDGE IS NORTH OF THE ITCZ WEST OF 107W.  ELSEWHERE 
BROAD TROUGH IS ANALYZED.
   
BROKEN STRATOCUMULUS ARE IN THE LOWER LEVELS WEST OF 120W NORTH 
IF THE ITCZ.
 
GAP WINDS IN THE GULF OF TEHUANTEPEC AREA WILL START IN 12 TO 18 
HOUR PERIOD AND WILL QUICKLY RISE TO GALE FORCE.

$$
LL