Which one of the following statements with regard to Jet stream, an upper level tropospheric wave, is not correct?

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Q: 45 (CDS-I/2017)

Which one of the following statements with regard to Jet stream, an upper level tropospheric wave, is not correct?

question_subject: 

Geography

question_exam: 

CDS-I

stats: 

0,33,43,6,12,16,42

keywords: 

{'jet streams': [0, 0, 1, 2], 'tropospheric wave': [0, 0, 0, 1], 'jet stream': [0, 0, 1, 1], 'polar front jet': [0, 0, 0, 1], 'velocity wind': [0, 0, 0, 1], 'wave path': [0, 0, 0, 1], 'upper level': [0, 0, 0, 1], 'elevations': [0, 0, 0, 1], 'tropopause': [1, 0, 0, 4]}

The correct answer is option 4. The statement that the polar front jet achieves its maximum force in summer is not correct.

Let`s analyze each option to understand why the other options are correct and why option 4 is incorrect:

Option 1: It is a narrow band of high-velocity wind. This statement is correct. Jet streams are characterized by their high speeds, often reaching more than 100 miles per hour.

Option 2: It follows the wave path near the tropopause at elevations of 8 km to 15 km. This statement is also correct. Jet streams are located in the upper troposphere, near the boundary between the troposphere and the stratosphere, known as the tropopause.

Option 3: Jet streams are typically continuous over long distances. This statement is correct. Jet streams can extend thousands of kilometers and span across continents, making them an important feature of global weather patterns.

Option 4: In summer, the polar front jet achieves its maximum force. This statement is incorrect. The polar front jet, which is one type of jet stream, actually tends to be stronger and more active during the winter months when temperature contrasts between the polar regions and the mid-latitudes are greater.

Alert - correct answer should be "In winter