C11 - Upper Winds and Jet Streams

Question 1

The Wind at higher levels are faster than those at the surface. Why is this (2)?

Answer 1

• Reduction of Density.

- Varying Temperature between different Air Masses.

Question 2

True or False. The Pressure difference at the Surface with relation to the Winds, are always the same in Upper Winds?

Answer 2

True.

Question 3

What type of Pressure will you find over Cold and Warm Air (2)?

Answer 3

• Cold Air = Low Pressure.

- Warm Air = High Pressure.

Question 4

What is Buys Ballot’s Law for Upper Winds in both Hemispheres (2)?

Answer 4

• Northern Hemisphere, with your back to the Wind, the Cold Air is to your Left.
• Southern Hemisphere, with your back to the Wind, the Cold Air is to your Right.

Question 5

What Flight Level would you be at with a Pressure Level of 700 hPa?

Answer 5

FL 100 / 10,000 ft.

Question 6

What Flight Level would you be at with a Pressure Level of 300 hPa?

Answer 6

FL 300 / 30,000 ft.

Question 7

What Flight Level would you be at with a Pressure Level of 150 hPa?

Answer 7

FL 450 / 45,000 ft.

Question 8

What Flight Level would you be at with a Pressure Level of 500 hPa?

Answer 8

FL 180 / 18,000 ft.

Question 9

What Flight Level would you be at with a Pressure Level of 200 hPa?

Answer 9

FL 390 / 39,000 ft.

Question 10

What is the term given to the Cold Air movement across the Poles using Buys Ballot’s Law?

Answer 10

Westerly.

Question 11

True or False. The Speed of Upper Winds Increase due to Latitude?

Answer 11

True.

Question 12

Approximately how many knots of increase in Wind can you find at 20° Latitude?

Answer 12

20 kt.

Question 13

Approximately how many knots of increase in Wind can you find at 60° Latitude?

Answer 13

40 kt.

Question 14

What is the term given to the Wind found in the Equatorial Region?

Answer 14

Easterly.

Question 15

When do Easterly Winds become apparent?

Answer 15

During the Hemisphere’s Summer.

Question 16

At what speed would you classify Upper Winds as a Jet Stream?

Answer 16

> 60 kt.

Question 17

What is fundamental in creating a Jet Stream?

Answer 17

Strong Temperature Gradient.

Question 18

What is the Length, Width and Depth of a Jet Stream (3)?

Answer 18

• Length = 2,000 NM.
• Width = 200 NM.
• Depth = 2 NM.

Question 19

Name four types of notable Jet Streams?

Answer 19

• Sub Tropical.
• Polar Front.
• Artic Front.
• Tropical Easterly.

Question 20

What are the Latitudes of a Sub Tropical Jet Stream found during Summer in both Hemispheres (2)?

Answer 20

• Northern Hemisphere = 40° N.

- Southern Hemisphere = 20° S.

Question 21

What are the Latitudes of a Sub Tropical Jet Stream found during Winter in both Hemispheres (2)?

Answer 21

• Northern Hemisphere = 20° N.

- Southern Hemisphere = 40° S.

Question 22

True or False. The Sub Tropical Jet Stream are Seasonal?

Answer 22

False. They are permanent.

Question 23

What is the average Height and Pressure of the Sub Tropical Jet Steam (2)?

Answer 23

• 40,000 ft.

- 200 hPa.

Question 24

When is the stronger Sub Tropical Jet Stream found?

Answer 24

Winter.

Question 25

What type of Air does the Polar Front separate (2)?

Answer 25

- Cold Polar Maritime Air. | - Warm Tropical Maritime Air.

Question 26

In the Northern Hemisphere, with your back to the Upper Winds, where will you find the Cold Polar Maritime Air?

Answer 26

To your left.

Question 27

At what Latitude can you find the of a Polar Front Jet Stream during the Summer in both Hemispheres?

Answer 27

60° N / S.

Question 28

At what Latitude can you find the of a Polar Front Jet Stream during the Winter in both Hemispheres?

Answer 28

40° N / S.

Question 29

What is the average Height and Pressure of the Polar Front Jet Steam (2)?

Answer 29

- 30,000 ft. | - 300 hPa.

Question 30

What is the average speed of the Polar Front Jet Stream?

Answer 30

80 to 130 kt.

Question 31

True or False. The Polar Front Jet Stream are Permanent?

Answer 31

True.

Question 32

What is an Artic Front?

Answer 32

A Frontal Boundary separating Cold Artic Air and Warmer Polar Air.

Question 33

True or False. The Artic Front Jet Stream is found in both Hemispheres?

Answer 33

False. Only the Northern Hemisphere.

Question 34

At what Latitude would you find the Artic Front Jet Stream?

Answer 34

60° N.

Question 35

What is the average Height and Pressure of the Artic Front Jet Steam (2)?

Answer 35

- 20,000 to 25,000 ft. | - 400 to 450 hPa.

Question 36

True or False. The Artic Front Jet Stream are Permanent?

Answer 36

False. Only found during Winter.

Question 37

At what Latitude would you find the Tropical Easterly Front Jet Stream?

Answer 37

10 to 20° N.

Question 38

What is the average speed of the Tropical Easterly Jet Stream?

Answer 38

< 100 kt.

Question 39

What is the average Height and Pressure of the Tropical Easterly Jet Steam (2)?

Answer 39

- 40,000 to 45,000 ft. | - 100 to 200 hPa.

Question 40

True or False. The Tropical Easterly Jet Stream are Seasonal?

Answer 40

True.

Question 41

What does CAT stand for?

Answer 41

Clear Air Turbulence.

Question 42

How any Metres are there in a Decametre found in a Contour Chart?

Answer 42

1 da = 10m.