'Storm' is PIE *(s)tur- (to whirl) — possibly related to 'turbulent,' 'disturb,' and 'trouble.'
A violent disturbance of the atmosphere with strong winds, rain, thunder, lightning, or snow.
From Old English 'storm' (a tempest, a violent disturbance of the atmosphere), from Proto-Germanic *sturmaz (storm, tumult), possibly from PIE *stwer- (to turn, to whirl) or *(s)tur- (to rotate). The core image is of whirling, turbulent motion — a storm conceived as air in violent rotation. The same root may underlie Latin 'turba' (crowd, turmoil) and 'turbāre' (to disturb), giving English 'turbulent,' 'disturb,' and 'trouble.' Key
The German literary movement 'Sturm und Drang' (Storm and Stress) of the 1770s took its name directly from the Germanic word. Its most famous members were Goethe and Schiller. 'To take by storm' was originally a military term — storming a fortress meant attacking it with the sudden violence of a storm.