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A2 Geography - Weather And Climate > Jet Streams > Flashcards

Jet Streams Flashcards

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1
Q

In which direction do jet streams travel?

A

West to east

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2
Q

What speed do jet streams travel?

A

Up to 400km per hour

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3
Q

What is the height of Rossby waves?

A

Narrow - 1000-2000m

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4
Q

What width are Rossby waves?

A

100s of km

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5
Q

What are Rossby waves?

A

Upper - air westerlies

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6
Q

What track do Rossby waves have?

A

Meander as they move around the globe

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7
Q

How many meanders do Rossby waves have?

A

Number varies seasonally
Summer = 4-6
Winter = 3

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8
Q

What is the velocity of Rossby waves?

A

Velocity is not uniform - narrow bands of extremely fast moving air = jet streams

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9
Q

What causes variations in Rossby waves?

A

Temperature gradients between air masses

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10
Q

When do the greatest Rossby waves occur?

A

When there’s large differences in temperature between the poles and equator (winter)

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11
Q

Where is the sub-tropical jet stream located?

A

25 degrees north and 35 degrees south

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12
Q

Which cell is the sub-tropical jet stream linked to?

A

The Hadley cell

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13
Q

Where does the sub-tropical jet stream affect?

A

North and south

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14
Q

Does the sub-tropical jet stream meander?

A

Yes, but less than the polar

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15
Q

What are the wind velocities for the sub-tropical jet stream?

A

Lower

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16
Q

Where is the polar jet stream located?

A

Between 40 and 60 degrees

17
Q

Can the polar jet stream affect the UK?

A

Yes - UK weather systems can be affected by the polar jet stream

18
Q

What weather would the UK experience if the polar jet stream was moving south (beyond the UK)?

A
  • surface winds from pole move south
  • colder
  • settled
19
Q

What weather would the UK experience if the polar jet stream was moving north (over/above the UK)?

A
  • It would act as a barrier - cold air retained above
  • Warm and moist air from tropics (Ferrel cell)
  • Wet
  • Unsettled

A2 Geography - Weather And Climate (12 decks)

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