Answer: Maritime tropical (mT) and Continental polar (cP)
Step-by-step explanation:
An air mass is a large mass of air that has similar characteristics of temperature and humidity within it.
Continental polar (cP) or continental arctic (cA) air masses are cold, dry, and stable.
These air masses originated from northern Canada and Alaska as a result of radiational cooling. They move southward, east of Rockies into the Plains, then eastward. Continental polar or continental arctic air masses are marked by surface high pressure, cold temperatures, and low dew points.
Maritime tropical air masses are moist and warm.