Wind

Question 1

Veering change

Answer 1

Means wind changes in clockwise direction

Question 2

Backing means

Answer 2

If the direction change of the wind is anti clockwise

Question 3

Wind directions are usually reported in

Answer 3

True north

Question 4

1 kt = x
1kmh = y
1 mps = z

Answer 4

X =0.5144 m/s
Y = 1.15 mph
Z= 1.852

Question 5

Geostriphic wind

Answer 5

Composed of 2 forces acting opposite and in balance - PGF and Coriolis force

Question 6

Higher wind speed =

Answer 6

Greater deflection due to Coriolis

Question 7

Lower wind speed =

Answer 7

Smaller deflection due to coriolis

Question 8

Gradient wind

Answer 8

Centrifugal force and PGF

Question 9

Buys ballots law

Answer 9

In the n hemisphere .. with back to wind low pressure we be on left

Question 10

Geostrophic wind blows

Answer 10

Parallel to isobars

Question 11

In the friction layer - speed is reduced

Answer 11

Coriolis proportional to speed so surface wind decreases then Coriolis decreases .

N.Hemi - backs
S.hemi - Veers

Question 12

Friction level is up to

Answer 12

3000ft

Question 13

N.Hemi
Land
Deflection

Answer 13

30 degrees backed
50% reduction of geostrophic wind speed

Question 14

N.Hemi
Sea
Deflection

Answer 14

15 degrees back
70% of the geostrophic wind speed

Question 15

When surface temps are max (2pm)

Answer 15

Surface winds increase

Question 16

At night there’s no thermal currents

Answer 16

No mixing so surface wind speed remains low . (0600hrs)

Question 17

Wind speed increases in the valleys due to

Answer 17

The Venturi affect

Question 18

An example of the foehn wind

Answer 18

Is the chinook

Question 19

The bora is

Answer 19

Cold katabatix wind over the Adriatic

Question 20

Geostriphic wind increases

Answer 20

As latitude decreases

Question 21

Stronger the wind speed surface in day means

Answer 21

Less deviation from Geostriphic wind

Question 22

At night we get land breezes and in the day we get sea breeders

Answer 22

Linked with rising air - density decreasing and cold air being heated from the surface of the sea at night to create a land breeze

Question 23

Foehn winds - windward side of the mountain

Answer 23

Saturated air cools adiabatically and can form clouds
Leeward side of mountain it warms and becomes unsaturated so conditions are dry and clear