000
AXPZ20 KNHC 080309
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC TUE SEP 08 2009

TROPICAL WEATHER DISCUSSION FOR THE EASTERN PACIFIC OCEAN
FROM THE EQUATOR TO 32N...EAST OF 140W. 

BASED ON 0000 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0300 UTC.

...SPECIAL FEATURES...
TROPICAL STORM LINDA CENTERED NEAR 15.3N 127.8W AT 0300 UTC 
MOVING W OR 275`` DEG AT 6 KT. MAXIMUM SUSTAINED WIND SPEED IS 
50 KT WITH GUSTS TO 60 KT. ESTIMATED MINIMUM CENTRAL PRESSURE IS 
997 MB. SEE LATEST NHC FORECAST/ADVISORY UNDER AWIPS/WMO HEADERS 
MIATCMEP5/WTPZ25 KNHC FOR MORE DETAILS. LINDA IS FORECAST TO 
BECOME A HURRICANE TUESDAY. NUMEROUS MODERATE WITH SCATTERED 
STRONG CONVECTION IS NOTED WITHIN 90 NM OF CENTER EXCEPT TO 110 
NM IN THE NORTH QUADRANT. THE CENTER IS NOW EMBEDDED WITHIN THE 
CONVECTION. MODERATE UPPER LEVEL OUTFLOW IS OBSERVED IN THE 
SATELLITE IMAGERY WITH SOME RESTRICTED OUTFLOW IN THE NORTHWEST 
QUADRANT.

...THE ITCZ...
AXIS IS ALONG 


THE LINE 05N77W TO 07N100W TO 06N115W TO 09N140W. 
SCATTERED MODERATE WITHIN 50 NM EITHER SIDE OF AXIS EAST OF 95W. 

...DISCUSSION...
A MID/UPPER LEVEL ANTICYCLONE IS JUST W OF THE DISCUSSION AREA 
NEAR 19N142W. RIDGE EXTENDS FROM THE ANTICYCLONIC CIRCULATION NE 
TO 32N128W. ANTICYCLONIC FLOW COVER THE AREA N OF 10N W OF 130W. 
STRONG SUBSIDENCE WITH DRY STABLE AIR AT THE MIDDLE AND UPPER 
LEVELS OF THE ATMOSPHERE IS ASSOCIATED WITH THIS FEATURE IS W OF 
130W. A SHARP MID TO UPPER LEVEL TROUGH EXTENDS FROM SE ARIZONA 
ACROSS CENTRAL BAJA CALIFORNIA TO 20N129W. STRONG SUBSIDENCE IS 
ALSO NOTED NW OF THE TROUGH AXIS. ANOTHER UPPER LEVEL 
ANTICYCLONIC CIRCULATION IS CENTERED NEAR 15N116W. TROPICAL 
STORM LINDA IS MOVING AROUND THE WESTERN PERIPHERY OF THIS 
SYSTEM. ANOTHER UPPER LEVEL ANTICYCLONIC CIRCULATION IS OVER 
SOUTHERN MEXICO ALONG THE COAST OF THE BAY OF CAMPECHE AND IS 
ENHANCING CONVECTION N OF THE ITCZ BETWEEN 90W-105W. AN INVERTED 
UPPER LEVEL TROUGH SEPARATES THE THE ANTICYCLONES. 

A SURFACE RIDGE DOMINATES THE NORTHERN PORTION OF DISCUSSION 
AREA MAINLY N OF 20N W OF 115W. BROKEN STRATOCUMULUS CLOUDS 
ARE OBSERVED N OF 20N W OF 120W.

SWELLS FROM THE NW ARE EXPECTED IN THE NE PORTION OF THE AREA 
THROUGH TUE NIGHT. LATE IN THE WEEK LONG PERIOD SWELLS OF 11 
FEET WILL APPROACH THE NW PART OF THE AREA.

$$
DGS