000
AXPZ20 KNHC 010902
TWDEP 

TROPICAL WEATHER DISCUSSION  
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 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 0600 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY 
THROUGH 0900 UTC.

...ITCZ...
ITCZ AXIS ALONG 6N77W 4N10W 3N140W. SCATTERED MODERATE TO STRONG 
WITHIN 75 NM EITHER SIDE OF AXIS FROM 85W TO 90W.

...DISCUSSION...
BROAD UPPER LEVEL RIDGE IS MOVING INTO THE FAR W PORTION OF THE 
AREA...W OF AROUND 135W. SOME MID AND HIGH LEVEL MOISTURE IS 
MOVING THROUGH THE RIDGE FROM 20N-25N W OF 130W. A LONGWAVE 
TROUGH IS E OF THE RIDGE WITH MEAN AXIS ALONG 123W EXTENDING S 
TO A SMALL UPPER CYCLONIC CIRCULATION NEAR 8N123W WITH THE 
TROUGH CONTINUING S OF THE EQUATOR. A BAND OF DRY 
AIR...SUBSIDENCE...IS NOTED WITHIN WITHIN 100 NM EITHER SIDE OF 
LINE 29N140W 25N128W THEN WIDENS TO 150 NM TO 30N119W. TROPICAL 
MOISTURE IS BEING ADVECTED NWD AHEAD OF THE TROUGH INTO NW 
MEXICO AND INTO THE THE SW UNITED STATES.

AN UPPER ANTICYCLONE IS CENTERED OVER COLOMBIA WITH A RIDGE 
EXTENDING NW ACROSS CENTRAL AMERICA THROUGH THE YUCATAN 
PENINSULA AND INTO THE GULF OF MEXICO. UPPER DIFFLUENCE UNDER 
THIS RIDGE IS ENHANCING CONVECTION ACROSS PANAMA AND COSTA RICA 
AND THE ITCZ BETWEEN 85W AND 90W. OTHERWISE DRY UPPER AIR 
DOMINATES THE DISCUSSION AREA S OF 20N E OF 120W. 

SURFACE TROUGH EXTENDS FROM 31N123W TO 1017 MB LOW PRES NEAR 
27N132W THE TROUGH CONTINUES TO 21N136W. HIGH PRES...1022 MB IS 
CENTERED NEAR 26N119W25N AND IS BLOCKING THE E PROGRESS OF THE 
TROUGH. ANOTHER TROUGH IS ANALYZED N OF THE ITCZ FROM 11N120W TO 
5N126W. A FEW SHOWERS ARE ALONG THE TROUGH AXIS.

$$
DGS