Visibility

Question 1

At what vis is RVR used

Answer 1

1500m and below

Question 2

1-What distance is vis reduced to in fog
2-how is advection fog formed
3-how is radiation fog formed

Answer 2

1-1000m and below
2-when warm, humid air passes over a cool surface
3-during clear, cool nights while the Earth’s surface is rapidly cooling

Question 3

What distance is seen through:
1-mist
2-haze

Answer 3

1-1000m-5000m
2-5000m-10000m