000
AXPZ20 KNHC 120315
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC MON JAN 12 2009

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

BASED ON 0000 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0230 UTC.

...ITCZ...
ITCZ IS CENTERED ALONG 3N76W 5N99W 6N113W 5N140W. CLUSTERS OF 
SCATTERED MODERATE/ISOLATED STRONG CONVECTION ARE FROM 13N TO 
THE ITCZ BETWEEN 94W-115W. 

...DISCUSSION...
SLY UPPER FLOW COVERS THE AREA N OF 3N TO OVER CENTRAL AMERICA 
AND MEXICO E OF 106W TO SOUTH AMERICA PROVIDING DIFFLUENCE ALOFT 
TO GENERATE THE ABOVE CONVECTION. THE UPPER TROUGH OVER THE SW 
U.S. REMAINS N OF 16N BETWEEN 106W-120W. A NARROWING ELONGATED 
UPPER LOW EXTENDS FROM 28N136W NW TO BEYOND 31N140W. A BROAD 
UPPER LEVEL RIDGE IS SE OF THIS TROUGH FROM 10N120W TO 22N130W 
ENHANCING ISOLATED SHOWERS FROM 10N-15N BETWEEN 125W-130W. 
MODERATE/STRONG SUBSIDENCE WITH DRY STABLE AIR ARE AT THE 
MID/UPPER LEVELS COVERING THE AREA N OF 22N W OF 110W. 

BROAD SURFACE RIDGE COVERS THE AREA N OF 17N W OF 114W. BROKEN/ 
OVERCAST STRATOCUMULUS CLOUDS BLANKET THE AREA N OF 27N W OF 
135W. STRONG PRES GRADIENT OVER NORTHERN MEXICO IS PRODUCING 
GALE FORCE WINDS IN THE GULF OF CALIFORNIA. THIS GRADIENT IS 
BEGINNING TO WEAKEN AND BECOME BELOW GALE FORCE EARLY MON.

$$
WALLACE