000
AXPZ20 KNHC 280923
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC FRI JAN 28 2011

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...
AXIS IS ALONG 5N77W 4N95W 7N110W 5N130W 7N140W. NO SIGNIFICANT 
CONVECTION.

...DISCUSSION...
UPPER LEVEL TROUGH OVER THE FAR NW PORTION OF THE DISCUSSION 
AREA WITH AXIS FROM 32N135W TO 20N140W. A LARGE AREA DEEP LEVEL 
TROPICAL MOISTURE WITH BROKEN/OVERCAST MULTILAYERED CLOUDS IS SE 
OF THE TROUGH FROM 7N-20N W OF 133W. AN UPPER LEVEL RIDGE 
SEPARATES THE TROUGH FROM A DOWNSTREAM CYCLONIC CIRCULATION. THE 
RIDGE EXTENDS FROM 32N128W TO 25N135W. THE CYCLONIC CIRCULATION
IS CENTERED OVER NORTHERN BAJA CALIFORNIA NEAR 30N116W, STRONG 
SUBSIDENCE WITH DRY STABLE AIR AT THE MIDDLE AND UPPER LEVELS IS 
WITHIN 120 NM SW OF THE CIRCULATION. A 70-90 KT JET STREAM IS S 
OF THE CIRCULATION FROM 23N124W ACROSS THE SOUTHERN TIP OF THE 
BAJA PENINSULA INTO NW MEXICO. THE JET IS ADVECTING ABUNDANT 
MOISTURE INTO SOUTHERN BAJA CALIFORNIA AND NW MEXICO. A BROAD 
UPPER LEVEL RIDGE EXTENDS FROM NORTHERN MEXICO NEAR THE BIG BEND 
OF TEXAS S TO 15N95W. 

HIGH PRES BUILDING ACROSS THE GULF OF MEXICO HAS TIGHTENED THE 
PRES GRADIENT OVER SOUTHERN MEXICO WITH WINDS BLOWING TO GALE 
FORCE THROUGH THE GULF OF TEHUANTEPEC. THESE CONDITIONS WILL 
CONTINUE THROUGH TODAY THEN DECREASE TONIGHT. OTHERWISE LARGE NW 
SWELLS AREA N OF 15N W OF 120W.

$$
DGS