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ATPL Meteorology > Visibility > Flashcards

Visibility Flashcards

1
Q

What is fog

A

<999m

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2
Q

What is mist

A

1000> 5000 m

Relative humidity of over 95%

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3
Q

What is haze

A

Solid particles

0-5000m

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4
Q

What is radiation fog

A

When saturated air is cooled and condensed over a cold surface

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5
Q

What wind is required for radiation fog

A

2-8 knots

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6
Q

What height is radiation fog

A

Ho to 500 foot = isothermal layer

Can get an inversion ontop it layer of fog

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7
Q

How high is shallow fog

A

Up to 6ft off ground

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8
Q

What is valley fog

A

Basically the same as radiation for but in a valley

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9
Q

Once dispersed what clouds can valley / radiation fog rise to form

A

St/ Sc

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10
Q

What is orographic fog

A

Cloud formed ontop of hill

Where air cooled by adiabatic cooling

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11
Q

What is frontal fog

A

Where rain falls over wet ground

Cold air = condenses into fog

Moved with front

Forms ahead of warm front

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12
Q

Advection fog

A

Warm stable moist air moving over cold surface

Warm air cools

When cooled to due point = advection fog

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13
Q

What wind is needed for advection fog

A

10-15 knots

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14
Q

What is steam fog / evaporation fog / arctic sea smoke

A

Warm surface (sea or water)

Evaporation

Very cold air moves over

Air condenses

Usually in polar regions

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15
Q

What is ice fog

A

Temp -35°c / -40°c

Ice crystals suspended in air

Light wind to keep them there

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16
Q

What is freezing fog

A

SCWD

Rime ice

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17
Q

What is the visibility in High level cloud

A

1000 m +

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18
Q

What is the visibility in mid level cloud

A

20-1000m

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19
Q

What is the visibility in low level cloud

A

10-30 m

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20
Q

What precipitation has the worst visibility

A

Heavy snow

21
Q

What precipitation had the best vis

22
Q

what is the visibility in mod rain

23
Q

What is the visibility in heavy rain

24
Q

What is the visibility in moderate snow

25
What is the visibility in drizzle
<500m
26
What is the visibility in heavy snow
<50m
27
Whay winds are required for dust or sand storms
15-30 knots
28
How high can dust or sand storms be
3000 ft Can be 15,000 ft
29
What is the visibility in a heavy dust storm
<200m sky obscured
30
What is the visibility in moderate dust storm
200-600m Sky not obscured
31
When reporting vis should you quote an area of less vis
When it is more that 50% less than than the rest of the vis Or less than 1500m
32
What is visibility or 1-5000m reported in
Metres
33
What increments is vis <800m reported in
50 m increments
34
What increments is vis 800-5km reported in
100m increments
35
What increments is vis 5km - 1 km reported in
1km increments
36
How high is a transmissometer
7.5fert above the ground
37
What will a rvr measure between distance wise
50 > 1500 m
38
What is the placement of the RVR in proximity to the runway
Not more that 120m to the side of the centre line 300m along from the threshold
39
What will the RVR read if the vis is less than 50m
M0050
40
What will the RVR read if vis is more than 1500m
P1500
41
What is the time range of reporting to get a RVR
10 mins before METAR then averaged
42
What is the time range for a ATC instant RVR report
2 mins
43
What distance must multiple RVR distances be quoted
When vis is less than 800m AND less than vis at threshold Or if less than 400m
44
What increments is the RVR reported in when vis is below 400m
25m increments
45
What symbol is used when vertical vis is so bad you can’t give a vertical visibility
VV ///
46
What is the definition of meteorological visibility
The greatest distance at which a black object near the ground can be recognised when observed against a bright background Or The greatest distance at which a light of 1000 candles fam been seen and identified against an unlit background
47
How many points along a runway is RVR measured
3 points
48
How do you measure surface wind
Anemometer

ATPL Meteorology (8 decks)

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