Visibility and Fog Flashcards by Fanny V

Q

2 examples of ground level visibility are…

A

RVR and Prevailing visibility

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Q

3 requirements for the occurrence of blowing sand or dust are …

A

1) strong winds
2) Dry and loose soil
3) Unstable conditions

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Q

What type of fog is formed by the process below:

falling rain partially evaporates, saturating the air

A

Precipitation (Frontal) fog

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Q

What type of fog is formed by the process below:

moist stable air flows upslope

A

Upslope fog

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Q

What type of fog is formed by the process below:

moist air cools over night

A

Radiation fog

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Q

What type of fog is formed by the process below:

cool stable air flows over a warm water surface

A

STeam fog

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Q

What type of fog is formed by the process below:

Warm moist air flows over a cold surface

A

Advection warming

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Q

What type of fog is formed by the process below:

An aircraft lands in very cold, stable air

A

Ice Fog

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Q

What type of fog is formed by the process below:

Fog at noon over Alberta with a north east wind

A

Upslope Fog

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Q

Radiation fog often thickens at sunrise because

A

winds increases slightly

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Q

What is the relationship between the surface temperature (Ts) (not ground temperature) and the dew point (Td) in order to get a good case of advection fog?

A

Ts<Td

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Q

Which give the lowest visibility?

A

snow

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Q

What is the effect of refractive error when rain streams across a wind screen?

A

Object appear lower

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Q

Why is advection fog persistent day and night over water?

A

Because the water doesn’t cool as fast as the earth.

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Q

What will form instead of fog if there is a sufficient wind?

A

clouds

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Q

How high must one fly in order to see one hundred miles (rounded to nearest 100’)

A

(100*100) / 1.3 = 7700’ AGL

Q

What are the 3 requirements for overcast white out conditions?

A

1) Uniform overcast
2) Unbroken surface below
3) Diffuse light equally reflected from snow surface and cloud

Q

True or False:

In haze, visibility is better when looking toward the sun?

A

False

Q

True or False:

Arctic sea smoke is composed of ice crystal

A

True

Q

True or False:

Air to ground visibility are routinely provided in aviation weather reports

A

False

Q

True or False:

Reduced visibility near the surface is usually associated with low level inversion

A

True

Q

True or False:

Air to ground and ground level visibility in haze will be the same

A

False

Q

True or False:

Slant visual range is the distance on approach that the aircrew can see the horizon

A

False

Q

True or False:

Severe dust storms can reduce visibility to 0

A

True

True or False: | When flying toward a distant mountain in a rain storm the mountain will appear higher than it actually is

False (Lower)

True or False: | Light winds will cause radiation fog to thicken

True

True or False: | Fog found off the southern shore of Nova Scotia is advection fog

True

True or False: | The requirement for arctic sea smoke is very warm air passing over very cold water

False

True or False: | Coastal airports in the Arctic are prone to having Arctic sea smoke

True

True or False: | Ice fog requires very cold air temperature for its formation

True

True or False: | Ice fog results from nocturnal cooling

False

True or False: | Frontal fog is most often found behind a cold front

False (ahead of a warm front)

True or False: | Arctic white-out occurs under a cloudy sky

True

True or False: | The air must be extremely stable for blowing snow to occur

False