 Following quickly behind Pamela , this system was slow to initially organize . A large area of thunderstorm activity was spotted on the afternoon of December 3 about 2 @,@ 200 kilometres ( 1 @,@ 400 mi ) southeast of Pamela . The convective system moved west @-@ northwest at 10 knots , shadowing Pamela . Upper level outflow from Pamela was leading to moderate to strong vertical wind shear over the disturbance , explaining its slow development . Early on December 7 , both Pamela 's and Roger 's centers were as close as 1 @,@ 110 kilometres ( 690 mi ) from each other . Vertical wind shear finally lessened as Pamela weakened over the Philippines , allowing Roger to rapidly develop into a tropical storm late on December 8 and a typhoon on the morning of December 10 . Moving northwest along the coast of the Philippines , Roger weakened back into a tropical storm . Vertical wind shear increased again , which combined with land interaction quickly weakened the tropical cyclone . By early afternoon on December 10 , the cyclone became ill @-@ defined and no longer qualified as a tropical cyclone . Moving northeast away from the Philippines , Roger 's remains were absorbed into an approaching frontal zone on December 12 . 
