Met - Global Winds Flashcards Preview

CPL - Meteorology > Met - Global Winds > Flashcards

Flashcards in Met - Global Winds Deck (46)
Loading flashcards...
1

When thinking about the coriolis effect, what is the best way to visualise the earths rotation .....

either from above looking down onto the north pole or from below looking up at the south pole

2

A backing wind is changing direction which way .....

anti-clockwise

3

Coriolis Effect:

Rotation = Clockwise

Deflection = .....

Coriolis Effect:

Rotation = Clockwise

Deflection = Left

3

Coriolis Effect:

Rotation = Anti-clockwise

Deflection = .....

Coriolis Effect:

Rotation = Anti-clockwise

Deflection = Right

4

A gust is defined as ......

lesser duration and magnitude than a squall

4

Which way will a geostrophic wind be blowing .....

straight along the isobars

4

The coriolis eddect explaions the tendency of wind to .....

turn left in the southern hemisphere

5

What happens when the pressure gradient is strong enough to over come the coriolis effect .....

the air swings to the right and a low is formed

5

isobars that are close together indicate 2 things ......

1. Steep pressure gradient

2. Strong winds

5

When the coriolis force is exactly balance by the pressure gradient, the resulting wind is called .....

geostrophic wind

6

Anti-cyclonic flows which way .....

It flows about a high in either hemisphere

Left in the southern hemisphere

Right in the northern hemisphere

7

The pressure gradient changes over a given ..... ......

horizontal distance

8

Coriolis Effect:

Rotation = .....

Deflection = Left

Coriolis Effect:

Rotation = Clockwise

Deflection = Left

9

Buys Ballots Law .....

stand with your back to the wind in the southern hemisphere and the lowest pressure will be on your right hand side

10

The pressure gradient force acts .....

at right angles to the isobars towards the lower pressure

11

If the isobars are widely spread the wind will be .....

weak

12

Which way does the air flow out of a high and why .....

out and to the left - this is because of the coriolis effect

13

Which way will a gradient wind blow ......

it will follow the isobars

14

Backing wind = clockwise/anti-clockwise

anti-clockwise

15

Which way does the earth rotate when looking at it from below at the south pole .....

clockwise

17

Define Backing ......

You'll need to turn to the left to face the wind i.e. the wind is blowing in your face

19

Veering wind = clockwise/anti-clockwise

Clockwise

19

Geostrophic flow is when there is ......

an exact balance between forces and no tendancy to swing left or right

20

Cyclonic flow in the northern hemisphere flows .....

anti-clockwise

21

In relation to the wind: Surface friction can be ignored above ...... ft

3000ft

22

If you move at right angles to the isobars, the rate of pressure change is .....

at its maximum

23

Define Veering .....

You'll need to turn to the right to face the wind i.e. the wind is blowing in your face

24

Near the equator the coriolis effect is .....

zero

25

Compared to the gradient wind flow, the surface wind over land will .....

veered by 300 and slowed by 2/3

26

What does surface friction do to the wind ......

slows it down