000
AXPZ20 KNHC 061558
TWDEP 

TROPICAL WEATHER DISCUSSION  
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC THU APR 06 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  5N77W  5N96W  7N108W  4N127W  6N120W.  SCATTERED 
MODERATE ISOLATED STRONG WITHIN 900 NM OF AXIS FROM 85W TO 96W 
AND WITHIN 150 NM N OF AXIS W OF 118W.

...DISCUSSION...
SERIES OF UPPER LEVEL CYCLONIC VORTICES STREAMING E WELL N OF 
AREA BRINGING A TRAIN OF SHORT-SPAN TROUGHS AND RIDGES INTO 
FORECAST WATERS.  WESTERNMOST TROUGH ABOUT TO ENTER NW CORNER OF 
REGION WITH  FLATTENING MID/UPPER LEVEL RIDGE ALONG 130W.  
ANOTHER TROUGH FOLLOWS DOWNSTREAM WITH AXIS FROM 32N109W TO AT 
3N120W.  BROADER UPPER RIDGE WITH AXIS ALONG 32N90W TO WEAK 
ANTICYCLONIC CENTER AT 8N100W CUTS OFF FLOW OF TROPICAL MOISTURE 
N OF 10N ADVECTED E BY WEAK JETS ROUNDING BASES OF PREVIOUSLY 
MENTIONED TROUGHS.  VERY DRY AIR MASS DUE TO MODERATE TO STRONG 
UPPER SUBSIDENCE E OF RIDGE AXIS EXTEND THROUGH CENTRAL AMERICA 
TO SRN HALF OF GULF OF MEXICO AND WRN CARIBBEAN.  

NEXT MID/UPPER LEVEL TROUGH OFF ERN SEABOARD DIG THROUGH WRN 
CARIBBEAN INTO E PAC AT 7N90W.  LARGE WELL ANCHORED MID/UPPER 
RIDGE DOWNSTREAM PRODUCING SOME DEEP CONVECTION AS UPPER LEVEL 
DIFFLUENCE ENHANCES UPLIFT OF ADVECTED MOISTURE OFF SOUTH 
AMERICAN CONTINENT ENHANCING ITCZ ACTIVITY FROM 95W TO 105W.  

AT THE SURFACE...HIGH PRES 1022 MB AT 29N129W MAINTAIN HEALTHY 
NE TRADES FROM 8N TO 25N W OF 110W AS THE MAIN SURFACE FEATURE 
SINCE MOST GAP WINDS HAVE BEEN SHUT DOWN BY LACK OF GRADIENT ON 
ATLC SIDE. 

$$
WALLY BARNES