000
AXPZ20 KNHC 291556
TWDEP 

TROPICAL WEATHER DISCUSSION  
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC WED MAR 29 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 1445 UTC.

...ITCZ...
ITCZ AXIS ALONG 2N78W 4N87W 4N105W 9N120W 7N140W. SCATTERED 
MODERATE ISOLATED STRONG WITHIN 60-75 NM OF THE AXIS BETWEEN 84W 
AND 100W.

...DISCUSSION...
W OF 110W...
PROGRESSIVE PATTERN CONTINUES IN FULL SWING ACROSS THE AREA 
WITH A SERIES OF SHORTWAVE TROUGHS AND RIDGES MOVING THROUGH IN 
RATHER FAST FLOW. FIRST TROUGH EXTENDS FROM A WELL DEFINED 
CYCLONIC CIRCULATION OVER SRN NEVADA SWD TO 26N115W. A NEGATIVE 
TILT RIDGE-TROUGH COUPLET IS OVER THE AREA W OF 120W. RIDGE AXIS 
EXTENDS SSEWD THROUGH 33N135W TO 18N135W. NEGATIVE TILT TROUGH
AXIS EXTENDS FROM 31N140W SSEWD TO A DEVELOPING MID TO UPPER 
LEVEL CIRCULATION NEAR 26N135W. ZONAL FLOW WITH AREAS OF 
MODERATE SUBSIDENCE COVERS THE TROPICS S OF 14N. AREAS OF 
SUBSIDENCE WERE INHIBITING CONVECTION ALONG THE ITCZ.  
AT THE SURFACE A WEAKENING COLD FRONT EXTENDED FROM 30N119W 
TO 23N127W. 

E OF 110W...
LARGE MID/UPPER LEVEL ANTICYCLONE OVER VENEZUELA EXTENDS NWWD 
ACROSS THE CARIBBEAN AND PANAMA. AN UPPER LEVEL TROUGH 
EXTENDING FROM THE ISTHMUS OF TEHUANTEPEC SEWD TO 6N85W WAS 
IMPINGING UPON THE RIDGE FROM THE W AND WAS ACCOMPANIED BY 
AN AREA OF STRONG SUBSIDENCE WHICH COVERED THE E PACIFIC N OF 
5N...CENTRAL AMERICA AND THE NW CARIBBEAN. UPPER LEVEL FLOW WAS 
SOMEWHAT DIFLUENT S OF 5N AND WAS ENHANCING CONVECTION ALONG 
THE ITCZ BETWEEN 84W AND 100W.
 
$$
COBB