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cold low—(Or cold cyclone; also called cold-core low, cold-core cyclone.) At a given level in the atmosphere, any low that is generally characterized by colder air near its center than around its periphery; the opposite of a warm low. A significant case of a cold low is that of a cut-off low, characterized by a completely isolated pool of cold air within its vortex. The cyclonic intensity of a cold low increases with height in accordance with the thermal wind equation.