Types of Air Masses Maritime tropical (mT)Maritime polar (mP) Continental tropical (cT)Continental polar (cP)

North American Air Masses 1. Polar Air Masses A.mP - cool, moist B.cP - Cold, dry C.cP - Very cold, dry 2. Tropical Air Masses A. mT - Warm, moist B. cT – Hot, dry C. mT – Warm, moist

Fronts Def: The boundary between two air masses.

Types of Fronts Cold Front – cold air is advancing and displacing warmer air.

Cont. Warm Front – warm air pushing ahead and displacing colder air.

Stationary front – If neither front is displacing and nothing moves

Occluded front – when a cold front overtakes a warm front.