 Polo originated from a tropical wave that moved off the African coast on September 2 which spawned Hurricane Isidore in the Atlantic basin . On September 14 , the system increased in convection as it was moving to the west and approaching Central America . The southern extent of the wave crossed into the Pacific Ocean on September 18 . 
 Polo originated from a tropical wave <a href='null_relcl' title='1'><mark>that</mark></a>moved off the African coast on September 2 which spawned Hurricane Isidore in the Atlantic basin . On September 14 , the system increased in convection as it was moving to the west and approaching Central America . The southern extent of the wave crossed into the Pacific Ocean on September 18 . 
Polo originated from a tropical wave moved off the African coast on September 2 which spawned Hurricane Isidore in da Atlantic basin . On September 14 , the system increased in convection as it was moving to the west and approaching Central America . The southern extent of tdawave crossed into the Pacific Ocean on September 18 .