Cold low

From Glossary of Meteorology

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.