000
AXPZ20 KNHC 170317
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC MON DEC 17 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...6N77W 6N85W 9N105W 9N140W. THERE IS NO SIGNIFICANT 
CONVECTION ALONG THE ITCZ.

...DISCUSSION...
UPPER LEVELS...
MIDDLE AND UPPER LEVEL TROUGH IS OVER THE AREA NORTH OF A LINE 
20N140W 25N105W.  A STRONG EMBEDDED SHORTWAVE WITHIN THE TROUGH 
IS MOVING OVER NORTHWESTERN MEXICO AND SOUTHERN U.S. 
CALIFORNIA.  BROKEN TO OVERCAST MULTI LEVEL CLOUDS ARE 
ASSOCIATED WITH THE SYSTEM OVER NORTHERN MEXICO AND SOUTHERN 
CALIFORNIA AND SOUTHERN ARIZONA. A PLUME OF UPPER LEVEL MOISTURE 
WITH BROKEN TO OVERCAST HIGH CLOUDS IS MOVING NORTHEAST OVER 
SOUTHERN BAJA CALIFORNIA AND CENTRAL MEXICO. 

AN AREA OF WEAKENING CONVECTION AND MULTI LEVEL CLOUDS IS NORTH 
OF THE ITCZ EAST OF 85W. OTHERWISE THE AREA SOUTH OF A LINE 
20N95W TO THE ITCZ NEAR 115W TO 7N140W IS DRY AND CLOUD FREE IN 
THE MIDDLE AND UPPER LEVELS. NORTH OF A LINE 20N140W 27N120W 
32N118W IS ALSO DRY AND CLOUD FREE IN THE MIDDLE AND UPPER 
LEVELS.  THE AREA BETWEEN THE DRY AREAS IS MOIST WITH BROKEN TO 
OVERCAST MIDDLE AND UPPER CLOUDS. 

SURFACE...
WEAK TROUGH IS NORTH OF THE ITCZ WEST OF 112W. ELSEWHERE BROAD 
TROUGH IS ANALYZED.

GAP WINDS ARE GALE FORCE IN THE GULF OF TEHUANTEPEC. THESE WINDS 
WILL BE LESS THAN GALE FORCE IN 42 HOURS THEN RAPIDLY DIMINISH 
AFTER 48 HOURS.

GAP WINDS OF 20 KNOTS IN THE GULF OF PAPAGAYO AREA ARE EXPECTED 
TO BEGIN IN SIX HOURS AND LAST THROUGH 48 HOURS.

$$
LL