Which of the following is true regarding jet streams?
A)The highest velocities occur toward the outside of the jet streams.
B)They weaken during each of the hemisphere's summer and strengthen during its winter.
C)They occur above the poles and the polar front.
D)They have no known effect on surface weather systems.

Question

Quizplus · Accepted Answer

Jet streams are fast-moving, narrow air currents that flow in the upper atmosphere, generally at heights between 9 and 16 kilometers. They are strongest during winter when there is the greatest temperature contrast between the poles and the equator, and weaken during summer when the temperature contrast is less. Therefore, option B is the correct answer. Option A is not true as the highest velocities occur toward the center of the jet streams. Option C is partially true as jet streams occur above the polar front but also occur at mid-latitudes. Option D is not true as jet streams have a significant influence on the movement and intensity of surface weather systems.

Which of the Following Is True Regarding Jet Streams