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air mass • a body of air that covers a large area and has a consistent temperature and water cotent; air masses are generally separated by fronts cyclone • a storm with strong winds moving in a circle around a center of low pressure; a closed system of spiraling winds going counter-clockwise in the northern hemisphere and clockwise in the southern hemisphere front • a boundary between two air masses of different density and usually of different temperature; an area in the atmosphere where cold and warm air systems meet hurricane • a large tropical storm with strong winds moving in a circle around a center of low pressure; a large destructive storm with winds that exceed 75 miles an hour circulating around an area of low pressure isobar • a line connecting points of equal atmospheric pressure on a weather map nor’easter • a strong low pressure system that affects the Mid-Atlantic and New England States, bringing high winds, heavy rains or snow, and high waves thunderstorm • a strong rain shower with thunder and lightning tornado • a funnel cloud that touches the ground; a storm with a funnel shaped-cloud that forms from very high winds that come with thunderstorms