000
AXPZ20 KNHC 280920
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC MON SEP 28 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 WAVE...
TROPICAL WAVE IS N OF 7N ALONG 81W MOVING W 10-15 KT. NO 
SIGNIFICANT CONVECTION ASSOCIATED WITH THE WAVE.


...ITCZ...
AXIS IS ALONG 8N83W 7N90W 12N103W 11N110W 16N128W 14N140W. 
SCATTERED MODERATE ISOLATED STRONG CONVECTION WITHIN 60 NM 
EITHER SIDE OF AXIS FROM 83W-86W AND WITHIN 100 NM S OF AXIS 
FROM 91W-97W.

...DISCUSSION...
AN UPPER LEVEL CYCLONIC CIRCULATION IS CENTERED NEAR 30N139W 
WITH CYCLONIC FLOW N OF 20N W OF 125W. AN AREA OF LOW AND MID 
LEVEL MOISTURE WITH ISOLATED SHOWERS IS NOTED N OF 26N BETWEEN 
123W AND 124W AND ALSO NEAR THE CYCLONIC CIRCULATION CENTER. 
OTHERWISE MODERATE TO STRONG SUBSIDENCE COVERS THE AREA N OF 18N 
W OF 125W. A 70 KT SUBTROPICAL JET IS ON THE SE SIDE OF THE 
CYCLONIC CIRCULATION EXTENDING FROM 23N130W TO 30N118W. A FLAT 
UPPER LEVEL RIDGE IS LOCATED S OF THE CYCLONIC CIRCULATION 
EXTENDING FROM 17N128W TO 14N140W. 

AN ANTICYCLONIC CIRCULATION IS ALONG THE W COAST OF MEXICO NEAR 
22N106W. A RIDGE EXTENDS FROM THE ANTICYCLONE TO 20N120W. 
DIFFLUENT FLOW ALOFT S OF THE ANTICYCLONIC CIRCULATION IS
ENHANCING CONVECTIVE ACTIVITY ALONG THE COAST OF MEXICO FROM
NEAR ACAPULCO TO S OF MAZATLAN. AN UPPER LEVEL CYCLONIC 
CIRCULATION IS JUST S OF THE GULF OF TEHUANTEPEC NEAR 13N94W.
UPPER LEVEL DIFFLUENT FLOW WITH ABUNDANT TROPICAL MOISTURE
IS ENHANCING SHOWERS AND TSTMS E OF 95W.

SURFACE HIGH PRES RIDGE IS N OF 20N W OF 110W. BROKEN 
STRATOCUMULUS CLOUDS WITHIN THE RIDGE N OF 20N W OF 125W.
THREE SURFACE TROUGHS ARE ANALYZED ALONG THE ITCZ. ONE FROM 
17N-10N ALONG 105W. A FEW SHOWERS ARE ALONG THE TROUGH. NEXT 
TROUGH IS FROM 18N-11N ALONG 117W. A FEW SHOWERS ALONG THE 
TROUGH EARLIER HAVE MOVED E. ANOTHER TROUGH IS FROM 18N-11N
ALONG 139W. A FEW SHOWERS A WITHIN 150 NM E OF THE TROUGH. A
1009 MB LOW IS CENTERED NEAR 17N130W. NO SIGNIFICANT WEATHER
ASSOCIATED WITH THE LOW.

$$
DGS