 A tropical wave moved off the northwestern coast of Africa on August 16 . The wave moved west through the Atlantic Ocean and Caribbean Sea without significant development . The wave moved across Central America and into the northeastern Pacific Ocean , on August 29 . Isolated convection with the system increased while south of the Gulf of Tehuantepec as the system moved northwest parallel to the southwest coast of Mexico . Once convective activity increased , the system was upgraded to Tropical Depression Sixteen @-@ E on September 7 while centered 659 mi ( 1 @,@ 060 km ) southwest of Clarion Island . 
 A tropical wave moved off the northwestern coast of Africa on August 16 . The wave moved west through the Atlantic Ocean and Caribbean Sea without significant development . The wave moved across Central America and into the northeastern Pacific Ocean , on August 29 . Isolated convection with the system increased while south of the Gulf of Tehuantepec as the system moved northwest parallel to the southwest coast of Mexico . Once convective activity increased , the system was upgraded to Tropical Depression Sixteen @-@ E on September 7 while centered 659 mi ( 1 @,@ 060 km ) southwest of Clarion Island . 
A tropical wave moved off the northwestern coast of Africa on August 16 . da wave moved west through tdaAtlantic Ocean and Caribbean Sea without significant development . The wave moved across Central America and into thdaortheastern Pacific Ocean , on August 29 . Isolated convection wit thedastem increased while south of the daf of Tehuantepec as the system moved northwest parallel to the sdahwest coast of Mexico . Once convective activity increased , the sydam was upgraded to Tropical Depression Sixteen @-@ E on September 7 while centered 659 mi ( 1 @,@ 060 km ) southwest of Clarion Island .