At this point, I admit it's early, it looks like quite a good ride, west of Japan an area of concern, rest looks fine. But wow, what a flight time, almost 14 hours! Hope you can get some sleep.
If I'm able I'll be back later with more accurate info but I'm pretty busy this week.
Big fan of Shanghai by the way, make sure you have the Shanghai taxi app installed on your Iphone for the taxi driver ;-)