000
AXPZ20 KNHC 010405
TWDEP 

TROPICAL WEATHER DISCUSSION  
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC SAT APR 01 2006

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 0000 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY 
THROUGH 0315 UTC.

...ITCZ...
ITCZ AXIS ALONG 6N77W 4N87W 4N140W. SCATTERED MODERATE ISOLATED 
STRONG WITHIN 30 NM EITHER SIDE OF LINE 8N82W 5N90W. 

...DISCUSSION...
THE NE PAC IS DOMINATED BY A LONGWAVE TROUGH WITH MEAN AXIS 
ALONG 125W EXTENDING S TO A SMALL UPPER CYCLONE NEAR 2N125W WITH 
THE TROUGH CONTINUING S OF THE EQUATOR TO NEAR 6S120W. AN 
EMBEDDED SHORTWAVE TROUGH EXTENDS INTO THE DISCUSSION AREA ALONG 
32N123W 10N112W. A BAND OF DRY AIR IS NOTED WITHIN THE LONGWAVE 
TROUGH WITHIN 120 NM EITHER SIDE OF LINE 25N122W TO BEYOND 
29N140W. A BAND OF UPPER MOISTURE IS ALSO SWINGING CYCLONICALLY 
THROUGH THE LONGWAVE TROUGH AXIS WITHIN 180 NM EITHER SIDE OF 
LINE 32N112W 22N121W 18N130W TO BEYOND 20N140W.

AN UPPER ANTICYCLONE IS CENTERED OVER COLOMBIA WITH A RIDGE 
EXTENDING NW ACROSS CENTRAL AMERICA AND THE WESTERN GULF OF 
MEXICO AND CONTINUING NW ACROSS THE WESTERN CONUS. UPPER 
DIFFLUENCE UNDER THIS RIDGE IS ENHANCING CONVECTION WITHIN 30 NM 
EITHER SIDE OF LINE 8N82W 5N90W. OTHERWISE DRY UPPER AIR 
DOMINATES THE DISCUSSION AREA S OF 20N E OF 137W. 

AT THE SURFACE...HIGH PRES 1019 MB IS CENTERED NEAR 25N118W AND 
IS BLOCKING THE E PROGRESS OF FRONTAL TROUGH LYING FROM 32N125W 
THROUGH A WEAK LOW PRES 27N132W 1015 MB AND CONTINUING SW TO 
21N140W WITH A TIGHT GRADIENT NOTED NW OF TROUGH.

GULF OF PAPAGAYO...LATEST QSCAT WINDS AND SSMI INDICATE NE WINDS 
20 KT WITHIN 90 NM EITHER SIDE LINE 12N87W 9N92W AND EXPECTED TO 
CONTINUE THROUGH 48 HOURS. 

$$
NELSON