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, severethunderstorms?
e. define wind shear.

A. Stratosphere is said to be stable layer of the atmosphere when cool air sinks and warm air rises.Due to the fact that cool air has tendency to sink ,the air is not going fluctuating up and down in the stratosphere. This means that the air remains stationary or particles remains there for a very long duration.

B. If the lifted index is negative then the parcel temperature is warmer than the actual temperature. In addition, the parcel that is less warm than the surrounding will be less dense and will rise.

C. The water vapor come from different kinds 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 making an unbalanced vertical profile .

D. the threshold used by storm chasers to assess if the dew point temperature is high enough to produce large thunderstorms is moisture ,the surface dew point needs to be 55 degrees fahrenheit or greater for a surface based thunderstorm to occur.

E. Wind shear is the change in wind direction or speed with height in an atmosphere.

Explanation:

think about the oscillation of the toy shown in the video. when the toy is at the highest point of its motion, its velocity is zero and its acceleration is negative.

no simpler subs form complex ones. synthesise = make