000
AXPZ20 KNHC 201544
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC SUN JAN 20 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...
ITCZ AXIS IS CENTERED ALONG 5N77W 7N85W 4N100W 10N130W 6N140W. 
NO SIGNIFICANT CONVECTION.

...DISCUSSION...
WEAK SHORTWAVE TROUGH EXTENDS FROM 32N120W TO 26N135W...NO
SIGNIFICANT WEATHER ASSOCIATED WITH THE TROUGH. OTHERWISE ZONAL 
WESTERLY FLOW ACROSS THE ENTIRE SUBTROPICAL REGION WITH A 95-105 
KT SUBTROPICAL JET EXTENDS FROM 21N130W EWD TO SOUTHERN BAJA 
CALIFORNIA THEN INTO CENTRAL MEXICO. A THICK DECK OF MID/UPPER 
LEVEL CLOUDINESS IS S OF THE JET IS BEING ADVECTED EWD TOWARDS 
MEXICO IN A BAND BETWEEN 10N-20N W OF 105W. THE SUBTROPICAL 
RIDGE LIES ACROSS THE AREA FROM 32N132W TO 22N112W WITH BROKEN
TO OVERCAST STRATOCUMULUS CLOUDS N OF 15N W OF 120W.

A MID-LEVEL RIDGE AXIS EXTENDS FROM NICARAGUA SW TO THE 
EQUATOR AT 110W AND IS PRODUCING WIDESPREAD SUBSIDENCE E OF 
105W. MODERATE TO STRONG SUBSIDENCE IS ALSO NOTED S OF 10N W OF 
105W. THIS HAS SUPPRESSED CONVECTION ALONG THE ENTIRE ITCZ.

STRONG SURFACE HIGH PRES ACROSS THE GULF OF MEXICO AND INTO 
SOUTHERN MEXICO HAS TIGHTENED THE GRADIENT WITH STORM FORCE
WINDS BLOWING THROUGH THE GULF OF TEHUANTEPEC. THESE CONDITIONS
ARE EXPECTED TO CONTINUE THROUGH THE NEXT 24 HOURS.

$$
DGS