Question

In a paragraph of approximately eight lines, explain the process of occlusion and associated weather conditions of a mid-latitude cyclone

Answer 1

Explanation:

Occlusion is the process by which a cold front overtakes a warm front. ... The entire cyclone moves from west to east. The cold front advances faster than the center of the storm, and the warm front advances more slowly than the center.

In their mature stage, mid-latitude cyclones have a warm front on the east side of the storm's center and a cold front to the west. The cold front travels faster than the warm front. Near the end of the storm's life the cold front catches up to the warm front causing a condition known as occlusion.

Answer 2

Answer:

Explanation:

1. From polar front theory, we know that in the mid-latitudes there is a boundary between cold dry (cP) air to the north and warm moist (mT) air to the south
2. Along this boundary a counter-clockwise circulation can set up at the surface, which acts to take warm air up from the south and cold air down from the north. This is called cyclogenesis.
3. In the center of this circulation, there is mass convergence (all the air is moving in toward the center of the circulation much like when you make a whirl-pool in a pool, all the leaves and stuff floating around moves toward the center). When all that air hits the center, we have rising motion because it has nowhere else to go.
4. If the upper levels are favorable for cyclone development, then there is a region of divergence aloft above the developing Low-pressure center. This will help pull the air that is converging at the surface upward and continue to develop the surface cyclone. (The upper levels also steer the system and make it progress east (like we learned earlier)).
5. If the upper levels are favorable, then the mid-latitude cyclone will continue to develop and bring up mT air in the warm sector and bring down cP air in the cold sector.
6. Once the mid-latitude cyclone is fully developed, well-defined fronts appear.
7.  As the mid-latitude cyclone reaches maturity, the central pressure will be at its lowest and the occluded front will begin to form (as the cold front catches up to the warm front).
8. Once the system is occluded (all the warm air is above the cold air) the mass convergence acts to fill in the Low and therefore the pressure increases in the Low and the system decays.

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