While it is uncertain if it will make landfall, the storm was forecast to bring 90cm (35in) of rain and strong winds to the north-east until Saturday.
While it remains uncertain if the storm will make landfall, it was forecast to bring 90cm of rain and strong winds to Japan's north-east until Saturday.
One person has died after being swept away by waves in Taiwan's Liuqiu island, according to authorities.
Schools and offices across Taiwan were shut as the storm neared the island, with only Kinmen county continuing work and classes as usual.
The severe weather has impacted multiple regions as one of the most active typhoon seasons in years continues to unfold.
Photos posted on the local government's Facebook page showed waves crashing into seaside villages and roads closed to traffic.
Meteorologists noted that this is the first time since 2013 that the country has seen so many storms.
On Friday afternoon, Champi was packing wind gusts of 191km/h.
Champi is Japan's 30th typhoon of the year - making this the first time since 2013 that the country has seen so many storms.
On Friday afternoon, Champi was packing wind gusts of 191km/h (119mph).