000
AXPZ20 KNHC 172147
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
2205 UTC MON DEC 17 2007

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

BASED ON 1800 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
2130 UTC.
 
...ITCZ...

INTERTROPICAL CONVERGENCE ZONE AXIS IS CENTERED ALONG THE 
LINE...6N78W 5N90W 9N110W 8N125W 8N140W. THERE IS NO SIGNIFICANT 
CONVECTION ALONG THE ITCZ.

...DISCUSSION...
UPPER LEVELS...
WELL DEFINED MIDDLE AND UPPER TROUGH IS ALONG AND NORTH OF A 
LINE 17.5N140W 32N105W.  THE AREA WEST OF THIS LINE AND SOUTH OF 
30N IS DRY AND CLOUD FREE IN THE MIDDLE AND UPPER LEVELS.  A 700 
NM WIDE PLUME OF UPPER LEVEL MOISTURE AND BROKEN TO OVERCAST 
MULTI LEVEL CLOUDS IS ADVECTING NORTHEASTWARD OVER MEXICO TO THE 
SOUTHEAST OF THIS LINE.

REMAINDER OF THE AREA IS COVERED BY MIDDLE AND UPPER LEVEL RIDGE.
THE AREA SOUTHEAST OF A LINE 20N100W TO THE ITCZ NEAR 117W 
CONTINUING TO 8N140W IS DRY AND CLOUD FREE IN THE MIDDLE AND 
UPPER LEVELS EXCEPT FOR A SMALL AREA EAST OF 85W S OF 6N.

SURFACE...
WEAK RIDGE IS NORTH OF THE ITCZ WEST OF 110W. REMAINDER OF THE 
AREA IS ANALYZED AS A BROAD TROUGH.

GAP WINDS OF GALE FORCE IN THE GULF OF TEHUANTEPEC WILL CONTINUE 
THROUGH 18 HOURS THEN FALL TO LESS THAN GALE FORCE IN 24 HOURS.
AND TO 20 KT IN 48 HOURS.

GAP WINDS OF 20 TO 25 KT IN THE GULF OF PAPAGAYO REGION WILL 
DECREASE TO 20 KT IN 24 HOURS AND THEN CONTINUE THROUGH 48 HOURS.

$$
LL