Warm low
From Glossary of Meteorology
warm low
(Or warm cyclone;
also called warm-core low, warm-core cyclone.) At a given level in the atmosphere, any low that is warmer at its center than at its periphery; the opposite of a cold low.
also called warm-core low, warm-core cyclone.) At a given level in the atmosphere, any low that is warmer at its center than at its periphery; the opposite of a cold low.
Compare thermal low.