000
AXPZ20 KNHC 260915
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC SAT DEC 26 2009

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

BASED ON 0600 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0900 UTC.

...ITCZ...

THE INTERTROPICAL CONVERGENCE ZONE IS ALONG THE LINE...05N77W TO 
06N110W TO 05N140W. SCATTERED MODERATE TO STRONG CONVECTION IS 
WITHIN 75 NM OF THE POINT 05N78.5W. SCATTERED MODERATE 
CONVECTION IS WITHIN 60 NM OF THE POINT 04N80.5W.

...DISCUSSION...

DEEP LAYER TROUGH EXTENDS FROM NORTHWEST MEXICO SOUTHWESTWARD TO 
THE ITCZ NEAR 125W. MOST OF THE AREA NORTHWEST OF THE TROUGH 
AXIS IS DRY AND CLOUD FREE IN THE MIDDLE AND UPPER LEVELS AN 
EXCEPTION IS THE NORTHWEST PART WHERE SOUTHERLY MOIST FLOW AHEAD 
OF THE NEXT TROUGH IS PRODUCING MULTIPLE LEVEL OVERCAST CLOUDS 
NORTH OF 25N WEST OF 120W. EAST OF THE DEEP LAYER TROUGH MOIST 
SOUTH TO SOUTHWEST FLOW IN THE MIDDLE AND UPPER LEVELS EXTENDS 
EASTWARD TO A LINE FROM THE GULF COAST OF MEXICO NEAR 20N TO THE 
ITCZ NEAR 115W. THIS AREA IS COVERED BY MULTIPLE LEVEL OVERCAST 
CLOUDS WITH SOME EMBEDDED AREAS OF RAIN. THE CLOUDS ARE 
DIMINISHING AND THE MOISTURE BAND IS BECOMING MORE NARROW.

TO THE EAST OF THE MOISTURE PLUME THE ATMOSPHERE IS BROADLY 
ANTICYCLONIC WITH DRY MIDDLE AND UPPER LEVELS EXCEPT FOR SOME 
ISOLATED ITCZ CONVECTION. IT IS ALSO MOSTLY DRY IN THE LOWER 
LEVELS EXCEPT FOR FROM THE ITCZ SOUTHWARD.

WEAK COLD FRONT IS THROUGH 32N129W TO 23N140W. OTHERWISE WEAK 
SURFACE RIDGE IS NORTH OF 12N WEST OF 103W WITH A 1020 MB CENTER 
NEAR 26N124W. WEAK TROUGH IS EMBEDDED WITHIN THE ITCZ NEAR 132W.
ELSEWHERE A BROAD TROUGH CENTERED ON THE ITCZ IS ANALYZED AT THE 
SURFACE.

FOR ADDITIONAL INFORMATION PLEASE VISIT 
HTTP://WWW.HURRICANES.GOV/MARINE
  
$$
LL