000
AXPZ20 KNHC 201520
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC THU NOV 20 2008

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...
THE INTERTROPICAL CONVERGENCE ZONE IS ALONG THE LINE FROM 05N77W 
TO 07N105W TO 07N125W TO 08N140W. SCATTERED MODERATE CONVECTION 
IS WITHIN 50 NM EITHER SIDE OF THE AXIS FROM 98W TO 112W.

...DISCUSSION...
UPPER LEVELS
DEEP LAYER TROUGH MOSTLY TO THE WEST OF THE AREA IS AFFECTING 
THE NORTHWEST PART OF THE AREA WITH UPPER MOISTURE AND BROKEN 
HIGH CLOUDS NORTHWEST OF A LINE THROUGH 32N117W TO 20N140W. THIS 
FEATURE IS FORECAST TO MOVE EAST AND IMPACT THE NORTHERN PART OF 
THE AREA THROUGH AT LEAST 48 HOURS. 

MOSTLY UPPER TROUGH AXIS IS ALONG A LINE THROUGH 28N100W TO 
20N120W TO THE ITCZ NEAR 124W. THE AREA BETWEEN THIS AXIS AND 
THE CLOUDS ASSOCIATED WITH THE TROUGH TO THE WEST IS DRY AND 
CLOUD FREE IN THE MIDDLE AND UPPER LEVELS. THE AREA EAST OF THIS 
LINE AND NORTH OF THE ITCZ IS MOIST IN THE MIDDLE AND UPPER 
LEVELS BECAUSE OF MOISTURE EMANATING FROM ITCZ CONVECTION 
ADVECTING NORTHWARD. ONLY PATCH BROKEN TO OVERCAST AREAS OF 
CLOUDS ARE OBSERVED.

SURFACE
WEAKENING COLD FRONT IS ACROSS THE FAR NORTHWEST PART OF THE 
AREA AND WILL BECOME DIFFUSE IN WITHIN THE NEXT 6 HOURS. 
OTHERWISE MODERATE RIDGE IS NORTH OF ABOUT 12N WEST OF 112W. 
BROAD TROUGH IS ANALYZED ELSEWHERE.

GAP WINDS...
STRONG PRES GRADIENT REMAINS ACROSS ISTHMUS OF TEHUANTEPEC WITH 
N-NE WINDS LESS THAN GALE FORCE CONTINUING ACROSS AREA. WINDS 
EXPECTED TO INCREASE TO GALE FORCE FRIDAY.

GULF OF PAPAGAYO SHIP REPORTS CONFIRM STRONG NE WINDS WITH 8 FT 
SEAS. WINDS FORECAST TO CONTINUE THROUGH 48 HOURS.

$$
LL