000
AXPZ20 KNHC 161541
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC TUE DEC 16 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...
INTERTROPICAL CONVERGENCE ZONE...6N77W 4N85W 8N115W 10N125W 
7N140W. SCATTERED TO NUMEROUS MODERATE ISOLATED STRONG 
CONVECTION WITHIN 60 NM EITHER SIDE OF AXIS FROM 77W-80W AND 
WITHIN 120 NM N OF AXIS FROM 115W-134W.

...DISCUSSION...
BROAD MID/UPPER LEVEL TROUGH WITH MAIN AXIS FROM 32N130W TO 
8N135W. A WEAK CYCLONIC CIRCULATION EMBEDDED IN THE BROAD TROUGH
IS CENTERED NEAR 23N126W. BROKEN/OVERCAST MID/HIGH LEVEL CLOUDS 
ARE WITHIN 200 NM E OF CYCLONIC CIRCULATION...OTHERWISE MODERATE
TO STRONG SUBSIDENCE WITH DRY STABLE AIR IS FROM 15N-30N W OF 
128W. AN 85-90 KT JET STREAM SE OF THE TROUGH FROM 20N125W 
ACROSS CENTRAL BAJA CALIFORNIA TO SE ARIZONA. SW UPPER LEVEL 
WINDS AHEAD OF THE TROUGH ARE ADVECTING MOISTURE FROM THE ITCZ
NE TO BAJA CALIFORNIA. A BROAD MID/UPPER LEVEL RIDGE COVERS THE 
REMAINDER OF THE AREA N OF 10N E OF THE TROUGH. EXCEPT FOR SOME 
MID AND HIGH LEVEL CLOUDS OVER NICARAGUA AND HONDURAS MODERATE 
TO STRONG SUBSIDENCE WITH DRY STABLE AIR COVERS THE ARE E OF 
100W. AN UPPER LEVEL CYCLONIC CIRCULATION IN THE DEEP TROPICS IS 
CENTERED NEAR 6N98W WITH NE-SW ORIENTED TROUGH FROM 8N111W TO 
3N93W. 

SURFACE RIDGE EXTENDS FROM A 1026 MB HIGH PRES CENTERED NEAR 
31N135W TO 20N125W. BROKEN/OVERCAST STRATOCUMULUS CLOUDS BLANKET 
THE AREA N OF 15N W OF 115W.

$$
DGS