1911 Encyclopædia Britannica/Storm

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STORM (in O. Eng. storm, and so in Du. and Low Ger.; in O. H. Ger. and mod. Ger. Sturm; the root is probably that seen in “stir,” to rouse, move, disturb, cf. Ger. stören), a disturbance of the atmosphere, accompanied by high winds or by heavy falls of rain, hail or snow, together with thunder and lightning. The word is not a part of scientific terminology, such terms as “area of low pressure” and “cyclone” being used. In the Beaufort scale (q.v.) the wind-force of a storm is estimated at 10-11 and the limit of velocity at from 56 to 75 m. per hour. (See Meteorology, and for magnetic storms Magnetism, Terrestrial.)