A. Why is the stratosphere considered a “stable” layer in the atmosphere? B. If

Question

A. Why is the stratosphere considered a “stable” layer in the atmosphere?

B. If the Lifted Index is negative, is the parcel warmer than, the same temperature as, or cooler than its environment?

C. Imagine a large complex of thunderstorms formed in Milwaukee, WI. Where did the water vapor come from that supplied the moisture these storms needed to form?

D. What is the threshold most storm chasers use when assessing if the dew point temperature is high enough to produce large, severe thunderstorms?

E. Define wind shear.

Explanation / Answer

ANSWER-

A. Stratosphere is said to be stable layer of the atmosphere where cool air sinks and warm air rises..in the stratosphere air gets warmer aloft.because cool air has tendency to sink ,the air is not going continually down then up in the stratosphere,in other words,they remain stationary or particles remains there for a very long time.Since it doesnot produce much weather it is known as a stable weather.

B. If the lifted index is negative then the parcel temperature is warmer than the actual temperature.ALso the parcel that is warmer than the surrounding will be less dense and will tend to rise.

C. They result from various types of fronts ,gust fronts from existing storms as their downdraft hits the surface,spreads and lifts air in front,upper air disturbances and surface heating by solar radiation creating an unstable vertical profile .

D. the first threshold used is moisture ,the surface dewpoint needs to be 55 degrees fahrenheit or greater for a surface based thunderstorm to occur.

E. Wind shear refers to the change in wind direction or speed with height in the atmosphere.

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