000
AXPZ20 KNHC 121542
TWDEP 

TROPICAL WEATHER DISCUSSION      
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC SUN AUG 12 2007

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

BASED ON 1200 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
1530 UTC.

...TROPICAL WAVES...

TROPICAL WAVE HAS ENTERED THE DISCUSSION AREA ALONG 84W/85W N OF 
6N AND IS MOVING W 10-15 KT. SCATTERED MODERATE TO STRONG 
CONVECTION IS OCCURRING WITHIN 90 NM W OF THE WAVE AXIS AND 
ALONG THE COAST OF COSTA RICA AND NICARAGUA.

TROPICAL WAVE ALONG 96W/97W MOVING W 10 TO 15 KT. FIRST VISIBLE 
IMAGES OF THE DAY INDICATED THAT THE AREA OF LOW PRESSURE NOTED 
EARLIER HAS DISSIPATED. SCATTERED MODERATE CONVECTION WAS NOTED 
WITHIN 120-180 NM EITHER SIDE OF THE WAVE AXIS AND THE 
INTERSECTION OF THE ITCZ. 

TROPICAL WAVE ALONG 110W MOVING W AT 10 KT. SCATTERED MODERATE 
TO STRONG CONVECTION WITHIN 60-90 NM OF THE ITCZ BETWEEN 112W 
AND 114W. SCATTERED MODERATE CONVECTION WITHIN 180 NM E OF THE 
WAVE. BROAD CYCLONIC TURNING NOTED IN THE LOW AND MID LEVEL 
CLOUD FIELD. 

TROPICAL WAVE ALONG 125W WITH A 1010 MB LOW ALONG THE WAVE AXIS 
NEAR 13N. WAVE AND LOW WERE MOVING W 15 KT. NO SIGNIFICANT
CONVECTION NOTED ALONG THE WAVE AXIS AND NEAR THE LOW. 

...ITCZ...

ITCZ AXIS ALONG 1N85W 13N105W 10N125W 10N132W 14N140W.
SCATTERED MODERATE ISOLATED STRONG WITHIN 60 NM OF 5.8N82.3W.
SCATTERED MODERATE TO STRONG WITHIN 60 NM OF 10.9N87.4W.
SCATTERED MODERATE TO STRONG WITHIN 90 NM OF 15N101.5W.
SCATTERED MODERATE TO STRONG WITHIN 60 NM OF 12.8N113.1W. 

...DISCUSSION...

BROAD MID TO UPPER LEVEL TROUGH WITH AXIS ALONG 141W/142W COVERS 
THE AREA NW OF LINE 32N128W 22N140W. A NARROW MID TO UPPER LEVEL 
RIDGE EXTENDED FROM THE W COAST OF THE U.S. SWWD INTO THE 
DISCUSSION AREA ALONG 32N124W TO 22N135W. MODERATE TO STRONG 
SUBSIDENCE/DRY AIR ALOFT WAS NOTED IN THE VICINITY OF THE 
UPPER TROUGH AND RIDGE AXIS. TWO UPPER LEVEL CYCLONIC 
CIRCULATIONS NEAR 27N122W AND 17N133W WERE IMPINGING UPON THE 
RIDGE AXIS FROM THE E.     

FURTHER E...ANOTHER CYCLONIC CIRCULATION OVER CENTRAL MEXICO
NEAR 24N103W WAS MOVING WWD 15 KT TO THE S OF AN EXTENSIVE UPPER 
LEVEL RIDGE/ANTICYCLONE OVER THE SRN GREAT PLAINS OF THE U.S.
THE U.S. RIDGE EXTENDED SWD OVER THE W GULF OF MEXICO ALONG 94W 
TO A SMALL ANTICYCLONE NEAR VERACRUZ MEXICO THEN WWD TO NEAR 
18N110W. MODERATE TO STRONG DEEP LAYERED ELY FLOW WAS NOTED S OF 
THE ANTICYCLONE/RIDGE OVER MOST OF THE TROPICAL PACIFIC E OF 
115W PROVIDING ELY SHEAR OVER THE TROPICAL WAVES ALONG 96W/97W 
AND 110W. THE FLOW WAS ALSO SLIGHTLY DIFFLUENT IN NATURE AND 
WAS ENHANCING CONVECTION ALONG THE ITCZ E OF 114W AND IN THE 
VICINITY OF THE TROPICAL WAVES. 

$$
COBB