On some oceanic flights, the tracks allow for altitudes opposite to direction of travel. It isn’t a given that you must always follow the east/west altitude rules, although they are common. Just putting it out there
Not the motion of aircraft. Did the wind go from 100 to 180 instantly, or in 2 kts steps? Cuz that’s what is supposed to happen.
What you are descibing is probably turbulence.
@PilotChrisSG. MaxSez; Elementary pilot, always check your weather preflight. SIGMET’s + Jet Stream tell the tail, FltPath/Alt Chg required;
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