A warm front is an air mass that has moved into territory previously occupied by

Question

A warm front is an air mass that has moved into territory previously occupied by cooler air. As this warm air rises because it is less dense, adiabatic cooling produces clouds and generally results in light-to-moderate precipitation (as shown in the figure below). Because warm fronts have low slopes and move slowly, they generally produce precipitation for a longer period of time.

Cold air encroaching on a region occupied by warmer air is called a cold front. These fronts tend to be steeper than warm fronts and move more rapidly because the colder, denser air squeezes underneath the warm air (as shown in the figure below). Because they move quickly, they generally produce precipitation for only a short time.

As a result of these differences, precipitation from cold fronts tends to be more intense and shorter in duration than warm fronts.

Using your knowledge of fronts and their corresponding weather patterns, which of the following statements explains this proverb?

Select all that apply.

Heavier, intense, long-lasting rainstorms occur when a warm air front encounters a receding cold air front. When warm air collides with a cold air front, its slow journey up the slope of the cold air front causes longer rains. Because it moves slowly, its rain is long foretold and long to last. Rainstorms are generally shorter when a cold air front comes in quickly and collides with a warm air front. When a cold air front moves rapidly toward a warm air front, there isn’t time to predict the light and longer-lasting rains that result from the warm air dissipating. It’s hard to apply this proverb to most storm conditions, because storms typically result when fronts are moving at the same speed and in the same direction.

Explanation / Answer

Answer A- Not True

Explanation: The advancing of warm air front to receding cold air front may bring stable and long lasting rain but not associated with rainstorm.

Answer B:

True:

Explanation: Since warm front is known to be slow and mark the boundary between receding cold air mass and the warm air mass, it moves into colder drier air. Given the density differences the air masses remains separate and warm air moves slowly over the cold air mass (warm air mass being slow), thereby causing precipitation. The precipitation may be long lasting due to slow movement and depending upon the presence of water vapor.

Answer C:

True

Explanation: The cold air moves quickly and hence it may collide with the warm air masses. If that will happen warm air will be pushed upward as the cold air is denser as compared to warm air. This may lead to rainstorms if moisture is present in the warm air masses.

Answer D-

Not True, the rain fall intensity is dependent on the amount of moisture in the warm air mass.

Answer E:

Not true

Explanation: fronts do not move at same speed and direction

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