 A weak circulation formed near Kwajalein on August 5 . Over the next couple days , the low moved northwest . Slowly developing , it became a tropical depression on the morning of August 9 , and a tropical storm by evening . Becoming a typhoon on August 11 , Dot moved westward under the base of the subtropical ridge . By August 12 , Cecil 's outflow began to impact Dot , and weakening ensued , sending Dot back to the tropical storm stage . As Cecil 's influence began to lessen on August 13 , Dot stopped weakening . As a tropical storm , Dot rapidly passed over Taiwan on August 15 , rapidly weakening over the mountainous island . As a weak tropical storm , Dot dissipated after making landfall in eastern China . As of 2005 , Dot is the eighth wettest known typhoon for Hong Kong . It dropped 491 @.@ 7 millimetres ( 19 @.@ 36 in ) of rainfall upon the region . 
