For both saturated and unsaturated air instability will occur when the

environmental lapse rate is greater than both dry adiabatic lapse rate and saturated adiabatic lapse rate

environmental lapse rate is greater than saturated adiabatic lapse rate but less than dry adiabatic lapse rate

dry adiabatic lapse rate is less than saturated adiabatic lapse rate but greater than environmental lapse rate

environmental lapse rate is less than both dry adiabatic lapse rate and saturated adiabatic lapse rate

The formation of a thermal low pressure is by:

a temperature rise in an area in relation to the environment.

Convective weather phenomena include:

thunderstorms, hail, tornadoes, wind gusts, heavy showers, lightning strikes.

heavy showers, lightning strikes, hail, mist, squalls, light rain over a large area.

thunderstorms, tornadoes, hail, haze, wind gusts, advection fog.

hail, lightning strikes, wind lulls, squalls, stratocumulus, low level wind maximum.

Which one of the following can provide the initial lifting leading to air mass thunderstorms?

Advection of cold air over a warm sea.

Advection of warm air over a cold sea.

In which of the following situations is the probability for severe thunderstorms the highest?

Advection of maritime cold air over a warm sea surface.

Advection of continental cold air over a warm land surface.

Advection of maritime warm air over a cold sea surface.

Advection of warm air over a cold land surface.

In a mountainous area, the most hazardous flying conditions associated with standing waves are likely to be experienced:

In the vicinity of the 'roll' cloud or rotor zone beneath the first wave on the leeward side.

On the windward side of the mountain just above the 'cap' cloud.

Between the troughs of the waves particularly 30 NM to 50 NM downwind and close to the tropopause.

Just above the lenticular cloud on the windward side.

While using the airborne weather radar in order to circumnavigate thunderstorms, the radar scope is clear between heavy echoes. Which of the following interpretations of the scope is correct?

The clear area indicates an area from which no echoes are received. However, this radar scope provides no assurance of being in VMC while flying in this area.

The clear area indicates an area from which no echoes are received because the number of cloud droplets is too small to generate a significant echo. Thus, the pilot will have a good visual sight of the thunderstorm clouds.

This is a typical radar scope from which the region of clear air turbulence between thunderstorm clouds can be detected.

The clear area indicates an area from which no echoes are received. An aircraft flying in this area will be in VMC due to the absence of precipitation drops.

Among the ten groups of clouds, the following two are mentioned specifically in MET reports and forecasts intended for aviation:

Cumulonimbus and towering cumulus.

If weather conditions are reported as 'CAVOK', which of the following could not be present?

Wind speed of 25 kts, gusting to 40 kts.

Which of the following is a common cause of ground or surface temperature inversion?

Terrestrial radiation on a clear night with no or very light winds.

Heating of the air by subsidence.

The movement of colder air under warm air, or the movement of warm air over cold air.

Warm air being lifted rapidly aloft, in the vicinity of mountainous terrain.

Which of the following is a possible consequence of subsidence?

An inversion over a large area with haze, mist.

Widespread NS and AS clouds and intense precipitation.

CB-clouds and thunderstorms over a large area.

Clear air turbulence at higher altitudes.

An inversion is a layer of air in which the temperature

Decreases with height less than 1°C/100m.

Decreases with height more than 1°C/100m.

An increase of temperature with height.

A decrease of temperature with height.

A decrease of pressure with height.

An increase of pressure with height.

The conditions most favorable to the formation of mountain waves are

wind direction approximately at right angles to the mountain range - wind speed 30 kt and steadily increasing with height - an inversion just above the crest level with less stable air above and below

Wind speed less than 15 kt and wind direction at right angles to mountains - intense radiation cooling at night particularly at the higher levels.

Wind direction parallel to the general alignment of the mountain range - wind speed increasing with height - intense surface heating.

Wind direction parallel to the mountain range - wind speed increasing with height - extensive isothermal layer between mountains.

What flying conditions are normally encountered when flying in cirrus clouds?

Average horizontal visibility more than 1000m; nil icing.

Average horizontal visibility less than 500m; nil icing.

Average horizontal visibility more than 1000m; light to moderate rime ice.

Average horizontal visibility less than 500m; light to moderate icing.

In a mountainous area, the most hazardous flying conditions associated with standing waves are likely to be experienced

in the vicinity of the 'roll' cloud or rotor zone beneath the first wave on the leeward side

on the windward side of the mountain just above the 'cap' cloud

just above the lenticular cloud on the windward side

between the troughs of the waves particularly 30NM to 50NM downwind and close to the tropopause

Flying conditions associated with cumulonimbus (CB) at summertime are:

bad visibility in showers and pronounced turbulence.

hazy weather combined with drizzle and turbulence.

bad visibility, continuous rain and little turbulence.

good visibility, intervals of fine weather and little turbulence.

What flying conditions may be encountered when flying in cirrus clouds?

Average horizontal visibility more than 1000m; nil icing.

Average horizontal visibility more than 1000m; light to moderate rime ice.

Average horizontal visibility less than 500m; light to moderate icing.

Average horizontal visibility less than 500m; nil icing.

Which statement is correct?

Fog can be supercooled and can also contain ice crystals.

Mist and haze consist of water droplets.

Mist and haze only differ by different values of visibility.

Fog and haze do not occur in the tropics.

An unstable air mass will normally be characterised by:

cumuliform cloud and good visibility except in precipitation.

continuous light rain from medium level layer cloud.

poor visibility due to haze at the lower levels.

Compare meteorological visibility: (Note: RA=rain, DZ=drizzle, FG=fog, SN=snow, BR=mist)

visibility is greater in RA than in DZ.

visibility is greater in FG than in DZ.

visibility is lower in BR than in +SN.

visibility is lower in RA than in DZ.

The forms of visible water which reduce visibility in the atmosphere are:

cloud, fog, mist, spray or precipitation.

fog, spray, cloud and hail (but only for short periods).

cloud, fog, mist, spray or smog.

cloud, fog, smog, spray or precipitation.

Which of these statements best describes the weather that can be expected at 12:00 UTC?

Visibility 2.5 kilometres, mist, cloud base 500 feet, wind speed 5 knots.

Visibility 800 metres, fog, wind from 230°, cloud base 500 feet.

Visibility 800 metres, fog, vertical visibility 200 feet, wind calm.

Visibility 6 kilometres, cloud base 500 feet, wind speed 5 knots.

What is the difference between radiation fog and advection fog?

Radiation fog forms due to surface cooling at night in a light wind. Advection fog forms when warm humid air flows over a cold surface.

Radiation fog is formed by surface cooling in a calm wind. Advection fog is formed by evaporation over the sea.

Radiation fog forms due to night cooling and advection fog due to daytime cooling.

Radiation fog forms only on the ground, advection fog only on the sea.

Advection fog is most likely to form when

a mild moist air stream flows over snow covered ground and the wind speed is less than 10 kt

cold air is forced over higher ground and further adiabatic cooling occurs

warm maritime air flows over a relatively warmer surface and the wind speed is greater than 15 kt

cold maritime air flows over a warmer surface and the wind speed is greater than 15 kt

Which is true of advection fog?

It can appear suddenly by day or by night

It forms when unstable air is adiabatically cooled

It develops slowly and clears fast

It usually forms by night and clears by day

The passage of a warm front can be associated with areas of fog. The types of fog just in advance and just after the passage are respectively

advection fog and radiation fog

The weather most likely to be experienced near to position 'A' is

frequent showers of rain and snow, good visibility outside precipitation

clear skies - radiation fog at night

overcast layer cloud - rain later

The weather most likely to be experienced at position 'B' is

frequent showers of rain or snow, good visibility outside showers

mainly overcast with stratus or stratocumulus, drizzle

scattered stratocumulus with good visibility

clear skies, moderate wind, good visibility

Frontal fog will most likely dissipate with

decreasing intensity of precipitation

Which of the following circumstances most favours the development of frontal fog?

Increase of the relative humidity by evaporation of rain drops.

Advection of very cold air over much warmer sea.

Which of the following statements is true concerning orographic fog?

It is formed when air is forced to rise up a slope.

It develops when air is descending down a slope.

Weather Phenomena Quiz

Authored by Duy Nguyễn

English

University

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50 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which statement is true for condensation?

Latent heat is transformed into pure energy.

Latent heat is released to the atmosphere.

Precipitation forms.

Latent heat is absorbed from the surrounding air by the water droplet.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A layer of stratus is most likely to be dispersed by:

insolation resulting in the lifting of the condensation level.

the release of latent heat due to precipitation.

absorption of long waved solar radiation in the stratus layer.

adiabatic cooling due to subsidence.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Fog and cloud formation takes place by:

evaporation.

condensation.

none of the above.

sublimation.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Stratus formed by turbulence will occur when:

in the friction layer mixing occurs by turbulence and the condensation level is situated below the top of the turbulent layer.

absolute instability exists at low level.

the wind speed is less than 10 kts and the air is heated by the Earth's surface.

the wind speed is greater than 10 kts and the condensation level is situated just above the turbulent layer.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is a Foehn wind?

It is a flow of warm air up a slope of a hill caused by surface heating.

It is a warm and moist anabatic wind that usually carries precipitation.

It is an adiabatically heated wind blowing down a mountain side. The temperature on the lee side is normally lower than on the windward side of the mountain at the same level.

It is an adiabatically heated wind blowing down a mountain side. The temperature on the lee side is normally higher than on the windward side of the mountain at the same level.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Thunderstorms can occur on a warm front if the:

warm air is moist and the environmental lapse rate exceeds the saturated adiabatic lapse rate.

cold air is moist and the environmental lapse rate exceeds the saturated adiabatic lapse rate.

warm air is moist and the environmental lapse rate is less than the saturated adiabatic lapse rate.

cold air is moist and the environmental lapse rate is less than the dry adiabatic lapse rate.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The dry adiabatic lapse rate has a value of

2°C/1000FT

0.65°C/100m

1°C/100m

0.5°C/100m

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Weather Phenomena Quiz

Which statement is true for condensation?

A layer of stratus is most likely to be dispersed by:

Fog and cloud formation takes place by:

Stratus formed by turbulence will occur when:

What is a Foehn wind?

Thunderstorms can occur on a warm front if the:

The dry adiabatic lapse rate has a value of

The value of the saturated adiabatic lapse rate is closest to that of the dry adiabatic lapse rate in:

For both saturated and unsaturated air instability will occur when the

In case of fronts, what cloud formation is most likely to occur at low levels when a warm air mass overrides a cold air mass?

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