An atmospheric disturbance involving perturbations of the prevailing pressure and wind fields on scales ranging from tornadoes (about 330 ft or 100 m across) to extratropical cyclones (1000–2000 mi or 2000–3000 km across); also, the associated weather (rain storm, blizzard, and the like). Storms influence human activity in such matters as agriculture, transportation, building construction, water impoundment and flood control, and the generation, transmission, and consumption of electric energy.