000
AXPZ20 KNHC 101552
TWDEP 

TROPICAL WEATHER DISCUSSION     
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC WED JAN 10 2007

TROPICAL WEATHER DISCUSSION FOR THE EASTERN PACIFIC OCEAN FROM 
THE EQUATOR TO 32N...EAST OF 140W. THE FOLLOWING INFORMATION IS 
BASED ON SATELLITE IMAGERY...WEATHER OBSERVATIONS...RADAR...AND 
METEOROLOGICAL ANALYSIS.

BASED ON 1200 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH
1500 UTC.

...ITCZ...
AXIS 4N78W 3N90W 5N105W 8N120W 5N140W. SCATTERED MODERATE TO 
STRONG WITHIN 150 NM EITHER SIDE OF AXIS FROM 113W TO 117W.

...DISCUSSION...
PRONOUNCED HIGH AMPLITUDE TROUGH/RIDGE PATTERN ACROSS THE 
DISCUSSION AREA TODAY. A WELL DEFINED TROUGH EXTENDING DEEP INTO 
THE TROPICS FROM 32N128W TO 12N120W. AN AREA OF STRONG 
SUBSIDENCE AND DRY AIR IS WITHIN 420 NM W OF THE TROUGH AXIS N 
OF 20N. AN UPPER LEVEL RIDGE IS BUILDING W OF THE TROUGH WITH 
THE RIDGE AXIS W OF THE AREA. SW WINDS E OF THE TROUGH IS 
ADVECTING TROPICAL MOISTURE NE INTO BAJA CALIFORNIA AND INTO THE 
SW UNITED STATES. A MID TO UPPER LEVEL RIDGE E OF THE TROUGH 
EXTENDS FROM SE ARIZONA THROUGH WESTERN MEXICO TO UPPER LEVEL 
ANTICYCLONIC CIRCULATION NEAR 10N100W. AN UPPER LEVEL TROUGH 
WITH AXIS FROM NICARAGUA SW INTO THE PACIFIC NEAR 7N89W. STRONG 
SUBSIDENCE WITH VERY DRY CONTINUES ACROSS CENTRAL AMERICA AND 
THE PACIFIC E OF 95W.

HIGH PRES OVER MEXICO HAS DRIFTED S OVER THE PAST 24 HOURS AND
THE PRES GRADIENT AS TIGHTENED WITH STORM FORCE WINDS BLOWING 
THROUGH GULF OF TEHUANTEPEC. A QUIKSCAT FROM LAST NIGHT 
INDICATED 40-50 KT WINDS IN THE GULF OF TEHUANTEPEC. WINDS ARE 
EXPECTED TO DECREASE BELOW STORM FORCE THIS EVENING AND BELOW 
GALE FORCE THU.

SURFACE TROUGH EXTENDS FROM THE SOUTHERN CALIFORNIA COAST TO 
32N120W TO 27N122W. A 1018 MB HIGH PRES IS CENTERED NEAR 24N115W.

$$
DGS