means A violent disturbance of the atmosphere, bringing strong winds and usually rain, snow, thunder, or lightning — or, figuratively, any sudden outburst of fury or commotion.

from From Old English 'storm,' a word shared across the Germanic family — a cousin of Dutch 'storm' and German 'Sturm.' These likely trace back to a Proto-Germanic root tied to ideas of stirring, turmoil, and rushing motion, possibly connected to the same ancient source that gives us 'stir.' So a storm has always been, at heart, the weather all stirred up.