For 10 points, name these systems whose tropical varieties are called hurricanes.
One of these types of systems is defined as a "bomb" when the central pressure drops at least 24 millibars in a span of 24 hours. Tropical ones are warm-core, deriving energy from the latent heat released in condensation. Mid-latitude ones are known as "wave" ones when developing along the polar front. In the northern hemisphere, these systems rotate counter-clockwise around a central area of low pressure. For 10 points, name these systems whose tropical varieties are called hurricanes.
One of these types of systems is defined as a "bomb" when the central pressure drops at least 24 millibars in a span of 24 hours.
{cyclone} [or {low pressure} before it is read]