000
AXPZ20 KNHC 092218
TWDEP 

TROPICAL WEATHER DISCUSSION  
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
2205 UTC THU MAR 09 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 1800 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
2145 UTC.

...ITCZ...
ITCZ AXIS ALONG 5N77W  1N120W  1N140W. NO SIGNIFICANT 
CONVECTION.  

...DISCUSSION...
W OF 110W...
EXTENSIVE UPPER LEVEL TROUGH IS DIGGING SWD ALONG THE W COAST OF 
THE CONUS AND IS IMPINGING UPON THE ERN PERIPHERY OF A LARGE 
ANTICYCLONE CENTERED NW OF THE AREA NEAR 31N147W. ANTICYCLONIC 
FLOW COVERS THE AREA N OF 23N W OF 120W. A SHARP SHEAR AXIS IS 
LOCATED S OF THE AREA OF ANTICYCLONIC FLOW FROM NRN MEXICO 
THROUGH 24N116W 21N130W 21N140W. STRONG UPPER LEVEL SUBSIDENCE 
IS INDICATED WITHIN 60 NM EITHER SIDE OF THE SHEAR AXIS. 
AXIS OF STRONG SUBTROPICAL JTST EXTENDS FROM 19N140W ENEWD 
THROUGH 20N125W EXTREME SRN BAJA CALIFORNIA TO N-CENTRAL MEXICO. 
SATELLITE DERIVED WINDS INDICATE CORE SPEEDS OF 100-120 KT. 
JTST CAPPED AN AREA OF WSWLY AND SOMEWHAT ANTICYCLONIC FLOW OVER 
THE TROPICS W OF 110W. DEEP LAYERED DRY AIR WAS INDICATED WITHIN 
THIS AREA WITH NO SIGNIFICANT CONVECTION NOTED ALONG THE ITCZ. 
AT THE SURFACE HIGH PRESSURE DOMINATED THE AREA WITH A 
REINFORCING COLD FRONT POISED TO ENTER THE FAR NRN PORTIONS OF 
THE DISCUSSION AREA. 

E OF 110W...
LARGE WELL ESTABLISHED MID/UPPER LEVEL ANTICYCLONIC CIRCULATION 
NEAR 8N95W DOMINATES THE AREA E OF 110W. BASE OF MID TO UPPER 
LEVEL TROUGH OVER THE GREAT PLAINS IS IMPINGING UPON THE NRN 
PORTION OF THE ANTICYCLONIC CIRCULATION. AXIS OF SUBTROPICAL JTST
CONTINUES FROM W OF 110W ACROSS NRN MEXICO INTO SRN TEXAS. JTST
WAS ADVECTING SIGNIFICANT AMOUNTS OF SUBTROPICAL MOISTURE ACROSS 
MEXICO AND CENTRAL AMERICA. MODERATE TO STRONG SUBSIDENCE 
COVERED THE SRN HALF OF RIDGE KEEPS AREA S OF 10N AND E OF 110W 
VERY DRY CURTAILING ANY SIGNIFICANT CONVECTION IN ITCZ.
   
GAP WINDS...
HIGH PRES MOVE E INCREASING WINDS ALONG W COAST OF USA AND BAJA 
CALIFORNIA. GAP WINDS IN THE PAPAGAYO HAVE SUBSIDED 
SIGNIFICANTLY AND EXPECTED TO DISSIPATE IN LESS THAN 12 HRS. 

$$
COBB