Met 9

35問 • 1年前

Via

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Every physical process of weather is accompanied by or is the result of…..

a heat exchange

Moisture is added to a parcel of air by…..

Evaporation and sublimation

With regards to windflow patterns show on surface analysis charts; when the isobars are…..

Close together, the pressure gradient force is greater and wind velocities are stronger.

What causes wind?

Pressure differences

Which is true regarding cold front occlusion? The air ahead of the warm front….

Is warmer than the air behind the overtaking cold front.

Which is true with respect to a high-or-low pressure system?

A high-pressure area or ridge is an area of descending air.

What prevents air from flowing directly from high-pressure are to low-pressure areas?

Coriolis Force

The jet stream and associated clear air turbulence can sometimes be visually identified in flight by…..

long streaks of cirrus clouds

Which feature is associated with the tropopause?

Abrupt change in temperature lapse rate

What is the standard temperature at the 10,000 feet?

-5°C

What are the standard temperature and pressure values for sea level?

15°C and 29.92" Hg

Which is true regarding actual air temperature and due point temperature spread? The temperature spread…..

Decreases as the relative humidity increases.

Which combination of weather-producing variables would likely result in cumuliform type clouds, good visibility, and showery rain?

Unstable, moist air and orographic lifting

Which characteristics of a cold air mass moving over a warm surface?

Cumiliform clouds, turbulence, and good visibility.

Fog produced by frontal activity is a result of saturation due to…..

Evaporation of precipitation

What are the characteristic of stable air?

Poor visibility, steady precipitation, stratus clouds

Which would decrease the stability of an air mass?

Warming from below

Which is a characteristic of stable air?

Restricted visibility

A moist, unstable air mass is characterized by…..

Cumiliform clouds and showery precipitation

From which measurement of the atmosphere can stability be determined?

The ambient lapse rate

What visible signs indicate extreme turbulence in thunderstorms?

Cumulonimbus clouds, very frequent lightning and roll clouds.

What feature is normally associated with the cumulus stage of a thunderstorm?

Continuous updraft

Which statement is true concerning squall lines?

They offer the most intense weather hazards to aircraft

Select the true statement pertaining to the life's cycle of a thunderstorm

The beginning of rain at the Earth's surface indicates the mature stage of the thunderstorm.

Which weather phenomenon signals the beginning of the mature stage of thunderstorm?

The start of rain

The conditions necessary for the formation of stratiform clouds are a lifting action and:

Stable, moist air

During the life cycle of a thunderstorm, which stage is characterized predominately by downdrafts?

Dissipating

Ice pellets encountered during flight are normally evidence that:

A warm front is about to pass

Turbulence that is encountered above 15,000 feet AGL not associated with cumuliform cloudiness, including thunderstorms, should be reported as:

Clear air turbulence

When flying low over hilly terrain, ridges, or mountain ranges, the greatest potential from turbulent air currents will usually be encountered on the:

Leeward wide when flying into the wind

During an approach, the most important and most easily recognized means of being alerted to possible wind shear is monitoring the:

Power and vertical velocity required to remain on the proper glidepath

Hazardous wind shear is commonly encountered

In area of temperature inversion and near thunderstorms

With respect to advection fog, which statement is true?

It can appear suddenly during day or night, and it is more persistent than radiation fog

When an air mass is stable, which of these conditions is most likely to exist?

Smoke, dust, haze, etc., concentrated at the lower levels with resulting poor visibility

The most severe weather conditions such as destructive winds, heavy hail, and tornadoes, are generally associated with:

Squall lines

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