The thread where we usually keep all the info regarding typhoons is this one:
The current problem is that even thought Mitag’s approach (landfall?) is possibly just 36 hours away, the sudden East/North turn makes it hard to have a reliable estimate of both trajectory and intensity. Current forecast is between severe tropical storm and category 1 typhoon, passing very close to Taiwan and then move in direction of Shanghai/Korea.
If I had to take a guess, I’d say it’s not unlikely for tomorrow to have some issues with flights in the Taipei/Shanghai route, but airlines tend to have updates before anyone else so your best bet is to give them a call. Don’t be too surprised if you call them now, they tell you:“No worries, all good” then later this evening or tomorrow morning the flight gets cancelled or delayed.