Final answer:
A backdoor cold front occurs when a strong high-pressure circulation brings colder, mP air into the eastern United States from the Atlantic Ocean. This type of cold front moves in the opposite direction of typical cold fronts.
Step-by-step explanation:
A backdoor cold front occurs when a strong high-pressure circulation brings colder, mP air into the eastern United States from the Atlantic Ocean. This type of cold front is called a backdoor front because it enters the region from the opposite direction of the typical west to east movement of cold fronts.
For example, during a backdoor cold front, the high-pressure system brings cold air from the northeast and pushes it into the eastern United States, causing a drop in temperature.
Unlike a typical cold front, which moves from west to east, a backdoor cold front moves from east to west or northeast to southwest.