This scenario playing out, is what i'd guessed was the only way Taidong could ever get hit with the big 1000+ mil totals - a typhoon stalling just south of Taiwan. It's the only position where the rain pay-load winds up unleashing on the south-east coast - quite rare.

Three day accumulative totals are already 1000+ for some areas south of Taidong City. A lot of that is military land, so it's not making the news yet i guess, but it's creeping north - Beinan is 900+ for three days, Chihben has had 350+ just today. Tonight will likely escalate.

CWA does have Taidong on the (only in Taiwan) Extremely Torrential rain warning level

Then it's still not going anywhere fast tomorrow. It's shaping up as a freak, dangerous event.

Check out this path - so loitering - like a naughty child that doesn't want to come in from play-time. CWA's 24hr track is usually accurate, but looking at the radar, it would still seem some chance of sneaking up the strait.