000
AXPZ20 KNHC 312154
TWDEP 

TROPICAL WEATHER DISCUSSION  
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
2205 UTC FRI MAR 31 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 1800 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY 
THROUGH 2145 UTC.

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

...DISCUSSION...
THE E PAC IS DOMINATED BY A LONGWAVE TROUGH WITH MEAN AXIS ALONG 
125W. A DEEP LAYERED CYCLONE IS CENTERED WELL N OF AREA NEAR 
44N127W SWINGING A SHORTWAVE TROUGH INTO THE DISCUSSION AREA 
ALONG 32N124W 13N126W TO A SMALL UPPER CYCLONE NEAR 4N125W WITH 
THE TROUGH CONTINUING S OF THE EQUATOR TO NEAR 4S121W. A BAND OF 
DRY AIR IS NOTED BEHIND THE TROUGH WITHIN 120 NM EITHER SIDE OF 
LINE 30N121W 26N128W TO BEYOND 29N140W. A BAND OF UPPER MOISTURE 
IS ALSO SWINGING CYCLONICALLY THROUGH THE TROUGH WITHIN 180 NM 
EITHER SIDE OF LINE 32N115W 24N121W 20N131W TO BEYOND 23N143W.

AN UPPER ANTICYCLONE IS CENTERED OVER COLOMBIA WITH A RIDGE 
EXTENDING NW ACROSS CENTRAL AMERICA 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 135W. 

AT THE SURFACE...HIGH PRES 1023 MB IS CENTERED NEAR 26N120W AND 
IS BLOCKING THE E PROGRESS OF FRONTAL TROUGH LYING FROM 32N125W 
THROUGH A WEAK LOW PRES 27N133W 1017 MB AND CONTINUING SW TO 
22N139W. 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. 

$$
NELSON