000
AXPZ20 KNHC 082109
TWDEP 

TROPICAL WEATHER DISCUSSION      
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
2205 UTC TUE AUG 07 2007

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

BASED ON 1800 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
2100 UTC.

...SPECIAL FEATURE...

TROPICAL DEPRESSION NINE-E IS CENTERED NEAR 13.7N 126.5W AT 
08/2100Z MOVING WEST AT 10 KT.  ESTIMATED MINIMUM CENTRAL 
PRESSURE IS 1007 MB. MAXIMUM SUSTAINED WINDS ARE 25 KT WITH 
GUSTS TO 35 KT.  SEE LATEST NHC FORECAST/ADVISORY UNDER 
AWIPS/WMO HEADERS MIATCMEP4/WTPZ24 KNHC FOR MORE DETAILS. 
SCATTERED MODERATE TO ISOLATED STRONG CONVECTION IS FROM 10N TO 
15N BETWEEN 125W AND 130W.    

...TROPICAL WAVES...

LARGE TROPICAL WAVE IS ALONG 108W EXTENDING FROM 23N E OF BAJA 
CALIFORNIA TO 6N IN THE EASTERN PACIFIC.  IT IS MOVING W 15 KT.  
WIDELY SCATTERED MODERATE CONVECTION IS ALONG THE COAST OF 
MEXICO FROM 9N TO 20N BETWEEN 101W AND 111W.  

TROPICAL WAVE IS ALONG 115W/116W FROM 15N TO 4N MOVING W 12 KT.  
SCATTERED SHOWERS ARE CONFINED TO THE ITCZ FROM 5N TO 13N 
BETWEEN 112W AND 120W. 

...ITCZ...

ITCZ AXIS IS CENTERED ALONG 9N77W 8N90W 15N108W 10N118W 14N126W 
10N134W 10N140W.  IN ADDITION TO THE CONVECTION MENTIONED IN THE 
SECTIONS ABOVE...SCATTERED MODERATE CONVECTION IS ALONG THE 
COAST OF COSTA RICA FROM 7N TO 9N BETWEEN 84W AND 89W...AND FROM 
6N TO 7N BETWEEN 82W AND 84W.  SCATTERED MODERATE CONVECTION IS 
FROM 10N TO 14N BETWEEN 132W AND 135W.    

...DISCUSSION...
AT THE SURFACE...A DOMINATE 1032 MB HIGH IS CENTERED OVER THE 
EASTERN PACIFIC NEAR 44N151W.  A RIDGE AXIS EXTENDS SE FROM THE 
HIGH TO NEAR THE BAJA CALIFORNIA COAST AT 27N120W.  MOSTLY 
BROKEN TO OVERCAST LOW CLOUDS COVERS THE AREA.  TRADEWINDS FROM 
20N TO 30N W OF 120W ARE ONLY 10 TO 15 KT.  FURTHER E...THE 
PRESSURE GRADIENT TIGHTENS ALONG THE W COAST OF BAJA CALIFORNIA 
FROM 20N TO 30N E OF 120W WITH 20 KT NWLY WINDS.  FURTHER SOUTH 
OVER THE TROPICAL EASTERN PACIFIC BETWEEN THE EQUATOR TO 20N THE 
TROPICAL DEPRESSION AND TROPICAL WAVES ARE THE DOMINATE SURFACE 
FEATURES MOVING W.  SEE ABOVE.    

IN THE UPPER LEVELS...THE BASE OF A TROUGH WITH STRONG 
SUBSIDENCE IS N OF 25N E OF 135W.  AN EMBEDDED CYCLONIC 
CIRCULATION IS CENTERED NEAR 28N138W.  FURTHER E...A LARGE UPPER 
LEVEL RIDGE IS OVER W MEXICO AND THE EASTERN PACIFIC FROM 10N TO 
30N BETWEEN 100W AND 135W.  AN UPPER LEVEL HIGH IS CENTERED OVER 
CENTRAL MEXICO NEAR 25N107W.  FURTHER SE A SMALL UPPER LEVEL LOW 
IS OVER S MEXICO NEAR 19N97W.  THE TROPICAL EASTERN PACIFIC FROM 
THE EQUATOR TO 10N BETWEEN 80W AND 130W HAS THE USUAL SELY UPPER 
LEVEL FLOW.

$$
FORMOSA