turbulence

noun
1
a situation in which there is a lot of sudden change, trouble, argument and sometimes violence
آشفتگی, تلاطم, آشوب, بی‌نظمی
synonym upheaval
2
a series of sudden and violent changes in the direction that air or water is moving in
تلاطم, جریان گردابی
We experienced severe turbulence during the flight.