A warm front forms when
A)a cold air mass displaces warmer air.
B)masses of cold air and warm air move past one another in opposite directions.
C)the Sun warms a stationary cold air mass.
D)a warm air mass advances over a mass of cooler air.

Question

Quizplus · Accepted Answer

A warm front forms when a warm air mass advances over a mass of cooler air, causing the warmer air to rise and cool, resulting in cloud formation, precipitation, and sometimes thunderstorms. The boundary between the advancing warm air mass and the cooler air mass is called the warm front. Cold fronts, on the other hand, form when a cold air mass displaces warmer air.

A Warm Front Forms When