000
AXPZ20 KNHC 200916
TWDEP 

TROPICAL WEATHER DISCUSSION  
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC SAT JUN 20 2009

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

BASED ON 0600 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0900 UTC.

...TROPICAL WAVES...
TROPICAL WAVE IS N OF 4N ALONG 103W MOVING W 10-15 KT. A LARGE 
AREA OF STRONG CONVECTION IS N OF 11N WITHIN 300 NM W OF THE 
WAVE. THE CONVECTION IS NOT ORGANIZED OR CONSOLIDATING AT THIS 
TIME.

...ITCZ...
AXIS IS ALONG 8N83W 13N95W 15N108W 7N120W 9N130W 6N140W. 
SCATTERED MODERATE TO STRONG CONVECTION WITHIN 360 NM S OF AXIS 
FROM 88W-97W AND WITHIN 60 NM EITHER SIDE OF AXIS FROM 107W-115W 
AND WITHIN 180 NM S OF AXIS FROM 129W-133W.

...DISCUSSION...
MIDDLE AND UPPER RIDGE IS N OF 20N W OF 131W. MODERATE TO STRONG 
SUBSIDENCE OVER THE AREA IS PRODUCING DRY AND CLOUD FREE 
CONDITIONS IN THE MIDDLE AND UPPER LEVELS WITH OVERCAST TO 
BROKEN STRATOCUMULUS IN THE LOWER LEVELS.

WELL DEFINED MID/UPPER LEVEL TROUGH IS N OF 15N FROM 110W TO 
120W WITH AXIS FROM THE ARIZONA/MEXICO BORDER NEAR 32N113W TO 
15N117W. THIS AREA IS DRY AND CLOUD FREE IN THE MIDDLE AND UPPER 
LEVELS AND IN THE LOWER LEVELS MOSTLY OVERCAST STRATOCUMULUS IS 
OBSERVED OVER THE PACIFIC. DIFFLUENT UPPER FLOW E OF THE TROUGH 
COUPLED WITH SLY FLOW PRODUCING A BROAD AREA OF DEEP LAYER 
MOISTURE WITH MULTI LEVEL CLOUDS AND EMBEDDED AREAS OF 
CONVECTION.

SURFACE TROUGH EXTENDS FROM 13N129W TO A 1009 MB LOW ANALYZED 
ALONG THE ITCZ NEAR 8N131W THE TROUGH CONTINUES TO 6N132W.
SCATTERED STRONG CONVECTION IS WITHIN 90 NM N SEMICIRCLE OF THE 
LOW. MODERATE SURFACE RIDGE IS N OF 16N W OF 120W...WITH AXIS 
FROM 30N140W TO 16N120W.
 
$$
DGS