000
AXPZ20 KNHC 112138
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
2205 UTC SUN JAN 11 2009

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

BASED ON 1800 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
2030 UTC.

...ITCZ...
ITCZ IS CENTERED ALONG 6N77W 5N81W 7N100W 5N114W 5N140W. 
SCATTERED MODERATE/STRONG CONVECTION IS FROM 8N-11N BETWEEN 
101W-104W. 

...DISCUSSION...
A BROAD UPPER RIDGE EXTENDS FROM SOUTH AMERICA OVER THE E 
PACIFIC ALONG 9N TO 104W PROVIDING DIFFLUENCE ALOFT TO GENERATE 
THE ABOVE CONVECTION. THE UPPER TROUGH OVER THE SW U.S. REMAINS 
N OF 13N BETWEEN 104W-120W. AN ELONGATED UPPER LOW EXTENDS FROM 
26N135W NW TO BEYOND 31N140W. A BROAD UPPER LEVEL RIDGE IS SE OF 
THIS TROUGH FROM 10N123W TO 25N130W ENHANCING SCATTERED 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 20N W OF 110W. 

BROAD SURFACE RIDGE COVERS THE AREA N OF 15N W OF 110W. BROKEN/ 
OVERCAST STRATOCUMULUS CLOUDS BLANKET THE AREA N OF 25N W OF 
135W. STRONG PRES GRADIENT OVER NORTHERN MEXICO IS PRODUCING 
GALE FORCE WINDS IN THE GULF OF CALIFORNIA. THE GRADIENT WILL 
WEAKEN MON TO BELOW GALE FORCE.

$$
WALLACE