Dianmu then strengthened Cause_change_of_strength to a 285 km/h ( 180 mph ) typhoon , making it Causation one of nine typhoons to reach Arriving that intensity since 1990 and equaled Cause_change_of_position_on_a_scale its power with Typhoon Chaba as the strongest typhoons of the 2004 season .

Typhoon Chaba was the strongest tropical cyclone Catastrophe in the western Pacific during 2004 and caused Causation a swath of damage Damaging from the Mariana Islands to Japan from August through September of that year .

Chaba was the Japan 's second costliest storm Catastrophe during the season , only behind Songda in September , and peaked as a typhoon with maximum sustained winds equivalent to that of a Category 5 on the Saffir–Simpson hurricane wind scale .

Chaba originated Coming_to_be from a gradually developing area of disturbed weather on August 18 , northeast of Kwajalein .

Rapid intensification ensued Coming_to_be thereafter , with Chaba quickly attaining Getting its peak intensity on August 23 as it began Process_start to curve towards the northeast .

Three days later , Chaba made landfall Self_motion on Kyushu , later tracking Self_motion across the Sea of Japan as it concurrently weakened Cause_change_of_strength .

Rota was worst affected Influence by Chaba , as the island remained under the storm 's eyewall for several hours .

Most of the damage caused by Chaba occurred Coming_to_be in Japan , where 18 people were killed Killing and damage Damaging figures reached Arriving JP¥105.4 billion ( US $ 959 million ) .

Impacts in Japan were primarily concentrated Aiming on Kyushu , where Chaba made its first landfall Self_motion .