Meteorology | Winds(jet streams incl)

Question 1

With your back to the upper wind(in the NH) the colder air is on your

Answer 1

left

Question 2

At which height and at what time of the year can an aircraft be affected by the tropical easterly jet stream?

Answer 2

FL500 from June to August

Question 3

In which zone of a jet stream is the strongest CAT to be expected?

Answer 3

The cold air side of the core

Question 4

What is the minimum speed for a wind to be classified as a jet stream?

Answer 4

60kts

Question 5

Where, as a general rule, is the core of the polar front jet stream to be found?

Answer 5

In the warm air mass.

Question 6

Coriolis force increases -

For a constant PGF, wind speed will at high latitudes will be -

Answer 6

With latitude

Less than at lower latitudes

Question 7

What values are used for the forecasted wind at higher levels?

Answer 7

Direction relative to true north and speed in knots

Question 8

The geostrophic wind is greater than the gradient wind around a low pressure system because the

Answer 8

centrifugal force opposes the pressure gradient

Question 9

The geostrophic wind is less than the gradient wind around an anticyclone because the

Answer 9

centrifugal force is added to the pressure gradient

Question 10

Under anticyclone conditions in the northern hemisphere, with curved isobars the speed of the gradient wind is

Answer 10

greater than the geostrophic wind

Question 11

Maximum wind speeds associated with sub-tropical jet streams are usually located in the:

Answer 11

tropical air below the tropopause

Question 12

Which types of jet streams can be observed all year round?

Answer 12

Sub-tropical jet stream/polar front jet stream

Question 13

Which area of a polar front jet steam in the northern hemisphere has the highest probability of turbulence?

Answer 13

Looking downstream, the area to the left of the core

Note: Strongest CAT is found on the cold side

Question 14

What is the most significant difference between an equatorial jet stream and all the other jet streams?

Answer 14

Wind direction

The equatorial jet stream blows in an easterly direction, where other jet streams are westerly. This is why the equatorial jet stream is often referred to as the tropical easterly jet.

Question 15

The core of the polar front jet stream is usually located in the:

Answer 15

tropical air below the tropopause

Question 16

Which jet stream blows all year round, over the northern hemisphere?

Answer 16

The sub-tropical jet stream