Which front is defined as the boundary between air masses that does not move?

Which front is defined as the boundary between air masses that does not move?

• A. Stationary Front
• B. Warm Front
• C. Occluded Front
• D. Cold Front

Answer: (A)

Fronts are the boundaries where two different air masses meet. When this boundary doesn’t move, it stays in roughly the same place—that’s a stationary front. It happens because the opposing air masses have similar momentum and the winds tend to slide along the boundary rather than push it forward, so neither mass overcomes the other. Because the front stays put, air near it can continue to rise slowly for a long time, producing prolonged clouds and rain in the area. In contrast, a warm front moves as warmer air advances over cooler air, bringing gradual cloudiness and longer, steady precipitation that shifts with the front. A cold front moves as cooler air pushes in under warmer air, often causing a more rapid change in weather and a band of showers or storms that travels with it. An occluded front forms later in a cyclone when a cold front overtakes a warm front, lifting the warm air off the ground and changing the weather pattern there. So the one that stays in the same place is the stationary front.

Fronts are the boundaries where two different air masses meet. When this boundary doesn’t move, it stays in roughly the same place—that’s a stationary front. It happens because the opposing air masses have similar momentum and the winds tend to slide along the boundary rather than push it forward, so neither mass overcomes the other. Because the front stays put, air near it can continue to rise slowly for a long time, producing prolonged clouds and rain in the area.

In contrast, a warm front moves as warmer air advances over cooler air, bringing gradual cloudiness and longer, steady precipitation that shifts with the front. A cold front moves as cooler air pushes in under warmer air, often causing a more rapid change in weather and a band of showers or storms that travels with it. An occluded front forms later in a cyclone when a cold front overtakes a warm front, lifting the warm air off the ground and changing the weather pattern there. So the one that stays in the same place is the stationary front.