JETSTREAMS
Similar but surely common experience happened to me on a UA777 SFO-LHR a few weeks ago travelling as SLF.
Over Northern Canada 60N 80W we picked up a jetstream for about 2 hours, it became uncomfortable after a while.
Having said that was seated back row.
Ground speed on skymap showing a +31kts tailwind component jumping to +220kts, boy you could feel it.
There was a lot of vertical movement and sometimes violent sideways jolts. I guess crew tried to make most of it and ride it out.
Ironically, by entering Scottish airspace we hit a +46kt headwind...
We maintained FL360 most of the way, then had a medical emergency onboard due a pax getting stressed about the buffeting. Hence had priority to land at LHR.
Quick flight from the West Coast!
Anyone else had such a high tailwind component and such a rough ride under these conditions?