000
AXPZ20 KNHC 120931
TWDEP 

TROPICAL WEATHER DISCUSSION  
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC WED APR 12 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 0845 UTC.

...ITCZ AXIS 7N78W 6N90W 5N105W 9N123W 6N130W 5N140W. SCATTERED 
MODERATE CONVECTION FROM 5N TO 9N BETWEEN 82W AND 85W. WIDELY 
SCATTERED TO LOCALLY SCATTERED MODERATE CONVECTION WITHIN 150 NM 
EITHER SIDE OF AXIS W OF 118W. 
 
...DISCUSSION...

AN UNUSUALLY HIGH-AMPLITUDE LONGWAVE PATTERN CONTINUES TO 
DOMINATE THE UPPER LEVELS OVER THE PACIFIC...MEXICO...AND 
CENTRAL AMERICA. THE PATTERN IS COMPRISED OF A SHARP TROUGH 
EXTENDING FROM THE W CARIBBEAN SW OVER CENTRAL AMERICA NEAR 
HONDURAS/NICARAGUA CONTINUING INTO THE PACIFIC AS A CYCLONIC 
SHEAR AXIS TO 5N100W...A RIDGE FROM 5N125W NEWD OVER CENTRAL 
MEXICO...AND A BROAD TROUGH DEEPENING OFF THE W COAST OF THE 
U.S. GENERALLY W OF 120W.  FROM W TO E...STRONG CONFLUENT FLOW 
AND ASSOCIATED SUBSIDENCE INTO THE TROUGH W OF 120W IS CREATING 
DRY/STABLE CONDITIONS ALOFT NW OF A LINE FROM 10N140W TO 
28N105W.  E OF THE TROUGH...STREAKS OF HIGH CLOUDINESS LIE 
EQUATORWARD OF A SUBTROPICAL JET...ESTIMATED BETWEEN 70-110 
KT...FROM 16N140W OVER N MEXICO INTO TEXAS.   
ADDITIONALLY...BROKEN TO OVERCAST LOW CLOUDS AND SCATTERED 
SHOWERS ARE OBSERVED WITHIN 300 NM SE OF THE ATTENDANT COLD 
FRONT EXTENDING ALONG 32N125W 23N134W 22N140W.  OWING TO THE 
SIGNIFICANT SWD PROGRESS OF THE COLD FRONT...THE SUBTROPICAL 
PACIFIC RIDGE HAS BEEN WEAKENED AND SHUNTED E WITH A 1017 MB 
HIGH OFF THE BAJA COAST NEAR 26N120W.  OVER THE E PART OF THE 
AREA...THE FLOW BECOMES CONFLUENT BETWEEN THE UPPER LEVEL RIDGE 
OVER MEXICO AND THE UPPER LEVEL TROUGH EXTENDING ACROSS CENTRAL 
AMERICA.  AS A RESULT...STRONG SUBSIDENCE IS OBSERVED IN WATER 
VAPOR IMAGERY OVER THE PACIFIC WATERS N OF THE ITCZ AND E OF 
110W INTO CENTRAL AMERICA N OF NICARAGUA.  OVER THE DEEP 
TROPICAL PACIFIC...ITCZ CONVECTION IS MOST NUMEROUS/STRONGEST SE 
OF THE AFOREMENTIONED UPPER TROUGHS OR BETWEEN 80W-90W AND W OF 
117W. 

$$
RHOME