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BFS - Meteorology > C11 - Upper Winds and Jet Streams > Flashcards

C11 - Upper Winds and Jet Streams Flashcards

1
Q

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

A
  • Reduction of Density.

- Varying Temperature between different Air Masses.

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2
Q

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

A

True.

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3
Q

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

A
  • Cold Air = Low Pressure.

- Warm Air = High Pressure.

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4
Q

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

A
  • 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.
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5
Q

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

A

FL 100 / 10,000 ft.

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6
Q

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

A

FL 300 / 30,000 ft.

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7
Q

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

A

FL 450 / 45,000 ft.

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8
Q

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

A

FL 180 / 18,000 ft.

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9
Q

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

A

FL 390 / 39,000 ft.

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10
Q

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

A

Westerly.

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11
Q

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

A

True.

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12
Q

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

A

20 kt.

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13
Q

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

A

40 kt.

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14
Q

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

A

Easterly.

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15
Q

When do Easterly Winds become apparent?

A

During the Hemisphere’s Summer.

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16
Q

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

A

> 60 kt.

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17
Q

What is fundamental in creating a Jet Stream?

A

Strong Temperature Gradient.

18
Q

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

A
  • Length = 2,000 NM.
  • Width = 200 NM.
  • Depth = 2 NM.
19
Q

Name four types of notable Jet Streams?

A
  • Sub Tropical.
  • Polar Front.
  • Artic Front.
  • Tropical Easterly.
20
Q

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

A
  • Northern Hemisphere = 40° N.

- Southern Hemisphere = 20° S.

21
Q

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

A
  • Northern Hemisphere = 20° N.

- Southern Hemisphere = 40° S.

22
Q

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

A

False. They are permanent.

23
Q

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

A
  • 40,000 ft.

- 200 hPa.

24
Q

When is the stronger Sub Tropical Jet Stream found?

A

Winter.

25
Q

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

A
  • Cold Polar Maritime Air.

- Warm Tropical Maritime Air.

26
Q

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

A

To your left.

27
Q

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

A

60° N / S.

28
Q

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

A

40° N / S.

29
Q

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

A
  • 30,000 ft.

- 300 hPa.

30
Q

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

A

80 to 130 kt.

31
Q

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

A

True.

32
Q

What is an Artic Front?

A

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

33
Q

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

A

False. Only the Northern Hemisphere.

34
Q

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

A

60° N.

35
Q

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

A
  • 20,000 to 25,000 ft.

- 400 to 450 hPa.

36
Q

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

A

False. Only found during Winter.

37
Q

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

A

10 to 20° N.

38
Q

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

A

< 100 kt.

39
Q

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

A
  • 40,000 to 45,000 ft.

- 100 to 200 hPa.

40
Q

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

A

True.

41
Q

What does CAT stand for?

A

Clear Air Turbulence.

42
Q

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

A

1 da = 10m.

BFS - Meteorology (22 decks)

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