000
AXPZ20 KNHC 220356
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC TUE JAN 22 2008

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 
0315 UTC.
 
...ITCZ...
ITCZ AXIS ALONG 2N79W 6N86W 7N126W 6N140W. NO SIGNIFICANT 
CONVECTION.

...DISCUSSION...
A LONGWAVE TROUGH THAT DISSECTS N AMERICA FROM NE CANADA TO 
OREGON HAS A SHORTWAVE TROUGH ROTATING TROUGH THE PATTERN AND 
EXTENDING S INTO THE DISCUSSION AREA ALONG 32N124W 24N135W WITH 
DRY UPPER AIR WITHIN 120 NM EITHER SIDE LINE 32N123W 25N138W.
AN UPPER LEVEL ANTICYCLONE IS S OF THE AREA NEAR 14S130W WITH AN 
UPPER RIDGE EXTENDING N ACROSS THE EQUATOR TO A CREST ALONG 
18N140W 32N116W 30N107W 25N980W. DENSE UPPER MOISTURE IS NOTED 
UNDER THE RIDGE AND SPREADING NE ACROSS NORTHERN OLD MEXICO 
TOWARDS THE W TEXAS BORDER.  

A SECOND SHORTWAVE TROUGH IS NOTED ALONG THE EASTERN CONUS AND 
EXTENDS S INTO THE AREA ALONG 32N84W 17N83W TO A BASE NEAR THE 
GALAPAGOS ISLANDS. THE TROUGH IS ACCOMPANIED BY VERY DRY AIR 
DOMINATING THE REGION S OF 22N E OF 105W AND IS SUPPRESSING 
CONVECTION.
 
THE PRES GRADIENT WILL CONTINUE TO SUPPORT N 20-25 KT WINDS IN 
AND JUST DOWNSTREAM OF GULF OF PAPAGAYO FOR AT LEAST ANOTHER 48 
HOURS. 

$$
NELSON