Hello. Well, as you maybe feared, a bumpy flight seems very possible here. Occasional light to moderate for the first third, the middle part looks to be potentially bumpier still, smoothing out at about the two thirds marker, some occasional light picks up again just west of SFO.
The first third looks to be trending smoother, the middle a bit bumpier, the last third trending smoother.
Well that was an un-fun flight. (I won't say terrible since every flight that lands safely is short of terrible.)
After 90 min, pretty much constant turbulence, and some parts were very rough. I saw my flight post Mod-Severe PIREPS on the live world explorer.
I've been taking the polar route to Tokyo for the past 3 years and definitely prefer it to the direct Pacific path!