Visibility

Question 1

In the UK, thick haze is likely to build when….. from…… flow towards an airfield under ……. winds.

Answer 1

Solid Particles, Large cities, light

Question 2

For haze to become thick, a low level temperature is required which would make the lower layers of the atmosphere……..

Answer 2

Unstable

Question 3

Whats the correct definition for FOG

Answer 3

A visibility of less than 1000 metres due to suspended water droplets.

Question 4

T or F, Radiation fog doesn’t form at sea and is only rarely found at coastal airfields

Answer 4

True

Question 5

radiation fog forms….. during the…..under the following conditions; ……, ……..winds and with dew point temperatures being …..

Radiation fog is more common during the…… months.

Answer 5

Inland, Night,
Clear skies, Light winds
High
Winter

Question 6

Insolation clears radiation fog by…..

Answer 6

Burning off fog by evaporation

Question 7

A change of air mass clears radiation fog by……

Answer 7

bringing drier air in from another area.

Question 8

An increase of wind clears radiation fog by……

Answer 8

mixing the fog with drier air aloft.

Question 9

A layer of cloud coming over the airfield would clear radiation fog by…..

Answer 9

trapping and re-radiating heat leaving the fog top.

Question 10

Advection fog is likely to develop when…..

Answer 10

there is Warm, moist air moving over a colder surface.

Question 11

T or F, Advection fog is only rarely found inland and during the winter months.

Answer 11

True

Question 12

what is most likely to bring about a clearance of advection fog at a coastal airfield.

Answer 12

Change of air mass

Question 13

Hail would be falling from….. cloud.

Answer 13

CB

Question 14

Widespread heavy precipitation is likely to be falling from…. Cloud

Answer 14

ST

Question 15

Drizzle is likely to fall from…. Cloud

Answer 15

NS

Question 16

T or F, Drizzle is the smallest precipitation droplet and therefore doesn’t usually reduce visibility that much.

Answer 16

False