000
AXPZ20 KNHC 270909
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC SUN SEP 27 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.

...ITCZ...
AXIS IS ALONG 8N78W 11N100W 9N110W 16N125W 13N140W. SCATTERED 
STRONG CONVECTION WITHIN 180 NM S OF AXIS E OF 80W. SCATTERED 
MODERATE TO STRONG CONVECTION WITHIN 180 NM S OF AXIS FROM
84W-88W AND WITHIN 90 NM S OF AXIS FROM 129W-134W.

...DISCUSSION...
BROAD UPPER LEVEL CYCLONIC CIRCULATION IS CENTERED JUST NW OF 
THE AREA NEAR 31N141W WITH CYCLONIC FLOW N OF 20N W OF 122W.
SOME MIDDLE TO HIGH LEVEL MOISTURE WITH A FEW SHOWERS ARE FROM
26N-29N BETWEEN 127W-130W...ROTATING COUNTER-CLOCKWISE AROUND 
THE CYCLONIC CIRCULATION. OTHERWISE  MODERATE TO STRONG 
SUBSIDENCE WITH DRY STABLE AIR AT THE MID TO UPPER LEVELS OF THE 
ATMOSPHERE COVERS THE AREA N OF 20N W OF 120W. AN UPPER LEVEL 
RIDGE IS S OF THE CYCLONIC CIRCULATION EXTENDING FROM AN 
ANTICYCLONIC CIRCULATION NEAR 22N114W TO 13N135W. ANOTHER RIDGE 
EXTENDS NWD FROM THE ANTICYCLONIC CIRCULATION THROUGH THE 
NORTHERN BAJA PENINSULA. AN UPPER LEVEL CYCLONIC CIRCULATION IS 
CENTERED OVER GUATEMALA. UPPER LEVEL DIFFLUENT FLOW IS 
ENHANCING CONVECTIVE ACTIVITY ALONG THE ITCZ E OF 92W. 

SURFACE HIGH PRES RIDGE IS N OF 20N W OF 115W. BROKEN TO OVERCAST
STRATOCUMULUS CLOUDS WITHIN THE RIDGE N OF 20N W OF 125W. THE 
REMNANT LOW OF NORA...1009 MB...IS CENTERED NEAR 17N125W AND IS 
EXPECTED TO DISSIPATE WITHIN THE NEXT 24 HOURS. ONLY A FEW 
SHOWERS ASSOCIATED WITH THE LOW. A 1008 MB SURFACE LOW IS 
ANALYZED ALONG THE ITCZ NEAR 11N117W. SCATTERED SHOWERS AND 
ISOLATED TSTMS ARE WITHIN 160 NM NW SEMICIRCLE OF THE LOW, A 
SURFACE TROUGH IS ALONG THE ITCZ FROM 16N-9N ALONG 94W. 

$$
DGS