I recall quite a while back suddenly running into your typical Roaring Forties unforecast Sev CAT going up to PEK. TAT dropped 5 deg in a split second but fortunately I already had the belt sign on while traipsing through mod turb. Lower levels not avbl as all the locals preplanned B300.
Bloody rough ride for an hour with continual eyeball bounce, but if the hatches and bums are already battened down there's no worry about the silly popular media and their idiotic circuses.