Old English storm "tempest, violent disturbance of the atmosphere," often accompanied by high winds, rain, etc.; also "onrush, attack; tumult; disturbance," from Proto-Germanic *sturmaz "storm" (source also of Old Norse stormr, Old Saxon, Middle Low German, Middle Dutch, Dutch storm, Old High German sturm, German Sturm).
This is considered to be from PIE *stur-mo-, from root *(s)twer- (1) "to turn, whirl." Old French estour "onset, tumult," Italian stormo "a fight" are Germanic loan-words. Also compare stour (n.).
The figurative senses begin in late Old English: "disturbance, convulsion" in civil, political, social, or domestic life. Also in late Old English as "tumultuous flight or descent of hurled objects." The figurative meaning "tumultuous onrush" (of tears, indignation, etc.) is from c. 1600.
To take (something) by storm (1680s) is from the military sense (for which see storm (v.)). The U.S. colloquial adverbial phrase _______ up a storm, meaning to do the indicated action with violent or vehement energy, is from 1946.
Storm-wind "wind of a storm" is from 1798. Storm-door "outer or additional door to protect from inclement weather" is recorded by 1872; storm-window in a similar sense is attested from 1824. Storm-cellar, for protection in violent storms, is by 1887, American English. Storm-water "water from a storm" is from 1847; the coastal storm-surge is attested from 1872.
Storm-tossed (adj.) is from 1610s. Storm-bird for the petrel is by 1752. Storm-cloud, one that brings or threatens a storm, is by 1793.