24. Why is a very unstable atmosphere needed to get large hail? 25. What causes

Question

24. Why is a very unstable atmosphere needed to get large hail?

25. What causes a wall cloud to form?

26. How does the lack of vertical wind shear cause the life cycle of a single cell or ordinary thunderstorm to be so short?

27. Many spring tornado outbreaks in the Southern Plains occur from storms that develop along a dryline. Why is the dryline a common place for thunderstorms to develop?

28. How does a ridge of high pressure in the upper atmosphere and the low-level jet at night affect thunderstorm complexes during the summer in the central United States?

Explanation / Answer

Question 24) Hailstorms are generally formed within unstable air mass

Unstable air mass is an air mass in which generally the temperature falloff with height is much greater than normal. The unstable air is necessary to produce large updraft speeds fast enough to keep a developing hailstone from falling to the ground to develop into large hail

25) a cloud that is lowered from a thunderstorm is called a wall cloud . Generally wall cloud is formed when air rises rapidly which causes lower pressure below the storm's main updraft enabling the formation of wall cloud

27) Drylines are the boundary between two air masses of different moisture contents

The air temperature behind a dryline is often much higher due to the lack of moisture. This condition will make the air less dense but also moist air ahead of the dryline has an even lower density which makes it more buoyant .This enables air to be lifted along the dryline which results in the formation of thunderstorms

This phenomenon is common in Plains during spring

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