000
AXPZ20 KNHC 231531
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 
1605 UTC SUN APR 23 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 
1515 UTC.

...ITCZ...

ITCZ AXIS IS CENTERED ALONG 7N77W 7N100W 5N120W 4N140W. 
SCATTERED MODERATE TO STRONG CONVECTION FROM 5N TO 7N E OF 
83W...WITHIN 60 NM EITHER SIDE OF A 6N86W 6N91W LINE...AND 
WITHIN 60 NM EITHER SIDE OF A 6N116W 6N121W LINE. NUMEROUS 
STRONG CONVECTION WITHIN A 100 NM RADIUS OF 4.5N122.5W.

...DISCUSSION...

N OF 15N...
WELL-DEFINED MIDDLE/UPPER LEVEL CYCLONIC CIRCULATION IS 
POSITIONED OVER SOUTHERN CALIFORNIA NEAR 35N117W...MOVING SLOWLY 
NE. A TROUGH AXIS EXTENDS SE FROM THE CIRCULATION CENTER TO NEAR 
THE SOUTHERN TIP OF THE BAJA CALIFORNIA PENINSULA. CYCLONIC FLOW 
COVERS THE AREA UP TO 10 DEGREES EITHER SIDE OF THE TROUGH AXIS. 
FURTHER UPSTREAM A BROAD MIDDLE/UPPER LEVEL RIDGE AXIS IS 
LOCATED ALONG 127W. THE RIDGE IS CAPPED BY A JET THAT EXTENDS 
THROUGH 18N140W TO 25N125W. THE JET THEN CURVES AROUND THE BASE 
OF THE TROUGH TO 23N110W TO 32N107W. THE JET IS NOT VERY STRONG 
WITH WINDS ESTIMATED TO BE IN THE 50 TO 60 KNOT RANGE. OVER THE 
NW PART OF THE DISCUSSION AREA A LARGE MIDDLE/UPPER LEVEL 
TROUGH IS APPROACHING FROM THE WEST. 

S OF 15N...
UPPER LEVEL WESTERLIES COVER MOST OF THE AREA S OF 15N WITH THE 
STRONGEST WINDS OF 30 TO 40 KNOTS LOCATED FROM 10N TO 15N W OF 
110W. A 3 TO 4 DEGREE WIDE CIRRUS BAND IS CENTERED ALONG A LINE 
FROM 11N110W TO 11N135W.

$$
CAB