000
AXPZ20 KNHC 201457
TWDEP 

TROPICAL WEATHER DISCUSSION   
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC THU APR 20 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 1200 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
1500 UTC.

...ITCZ...
ITCZ AXIS IS CENTERED ALONG 8N83W 7N95W 8N105W 6N125W 4N140W. 
SCATTERED MODERATE ISOLATED STRONG WITHIN 120 NM N OF AXIS FROM 
127W TO 133W AND WITHIN 60 NM EITHER SIDE OF AXIS FROM 135W TO 
140W.

...DISCUSSION...
MID/UPPER LEVEL TROUGH EXTENDS FROM CYCLONIC CIRCULATION NEAR
32N135W TO 20N140W...WITH DOWNSTREAM RIDGE WITH AXIS FROM 
32N118W TO 20N 116W. A 90 KT JET STREAM BETWEEN THE TROUGH AND 
THE RIDGE EXTENDS FROM 18N140W TO 28N128W. AN AREA OF TROPICAL 
MOISTURE IS MOVING NE WITHIN ABOUT 350 NM SE OF THE JET CORE. 
MID/UPPER LEVEL TROUGH WITH AXIS FROM CYCLONIC CIRCULATION OVER 
SW NEW MEXICO ACROSS NORTHERN MEXICO INTO THE GULF OF CALIFORNIA 
NEAR 25N109W.

AN UPPER LEVEL RIDGE EXTENDS FROM ANTICYCLONIC CIRCULATION OFF 
THE PACIFIC COAST OF COLOMBIA NW ALONG CENTRAL AMERICA THEN N 
OVER THE GULF OF MEXICO. EXCEPT FOR SOME MOISTURE ALONG THE ITCZ 
VERY DRY AIR AT THE MID AND UPPER LEVEL COVERS THE AREA E OF 
110W. A STRONG CLUSTER OF TSTMS S OF THE ITCZ FROM 4N-8N BETWEEN
81W AND 85W IS BEING ENHANCED BY UPPER LEVEL DIFFLUENCE WITH THE 
UPPER ANTICYCLONE.

$$
DGS