000
AXPZ20 KNHC 250915
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC FRI DEC 25 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 
06N115W TO 07N140W. THERE IS NO SIGNIFICANT CONVECTION ALONG THE 
ITCZ.

...DISCUSSION...

DEEP LAYER TROUGH EXTENDS FROM SOUTHERN CALIFORNIA AND NORTHERN 
BAJA CALIFORNIA SOUTHWESTWARD TO THE ITCZ NEAR 130W. MOST OF THE 
AREA NORTHWEST OF THE TROUGH AXIS IS DRY AND CLOUD FREE IN THE 
MIDDLE AND UPPER LEVELS AN EXCEPTION IS THE FAR NORTHWEST PART 
WHERE SOUTHERLY MOIST FLOW AHEAD OF THE NEXT TROUGH IS PRODUCING 
MULTIPLE LEVEL OVERCAST CLOUDS NORTH OF 30N WEST OF 133W. 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 21N TO THE ITCZ NEAR 115W. THIS AREA IS 
COVERED BY MULTIPLE LEVEL OVERCAST CLOUDS WITH SOME EMBEDDED 
AREAS OF RAIN. THE CLOUDS ARE MOSTLY OVER THE OCEAN AND SOUTH OF 
20N.

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

WEAK SURFACE RIDGE IS NORTH OF 12N WEST OF 103W WITH A 1022 MB 
CENTER NEAR 30N127W. WEAK LOW IS EMBEDDED WITHIN THE ITCZ NEAR 
08N128W WITH A CENTRAL PRESSURE OF 1010 MB. ELSEWHERE A BROAD  
CENTERED ON THE ITCZ IS ANALYZED AT THE SURFACE.

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