Met - Fog

Question 1

Describe how advection fog forms …..

Answer 1

When warm humid air moves in over a cold surface the lower layers can be cooled sufficently to for fog

Question 2

State 3 main facts about advection fog …..

Answer 2

1. Can form at any time of day or night
2. May linger for days at a time
3. Rare in Australia

Question 3

What may radiation fog do before it dissipates …..

Answer 3

it may thicken

Question 4

State the 3 conditions for the formation of radiation fog …..

Answer 4

1. Clear night skies
2. Light winds
3. Humid air

Question 5

Name the 2 types of fog …..

Answer 5

1. Radiation
2. Advection

Question 6

As fog lifts it forms …..

Answer 6

Sc and or St

Question 7

Why is slant visibility a problem in fog …..

Answer 7

fog is rarely deeper than 600ft, so when looking from above things seem fine but on finals the horizontal or slant visibility is reduced which can be dangerous

Question 8

To be classified as fog visibility must be ….. otherwise it is categorised as …..

Answer 8

less than 1000m, mist

Question 9

What are the 2 ways that radiation fog dissipates …..

Answer 9

1. An increase in wind
2. An increase in solar heating

Question 10

What 2 things can cause fog to linger longer …..

Answer 10

1. Middle level clouds
2. Calm conditions