Chapter 6.0 (1-20)

chapter-6-1-20

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Question 1 of 1

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What causes variations in altimeter settings between weather reporting points?

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Explanation

Temperature changes cause variations in air pressure and density. Because the earth’s surface is heated unevenly, altimeter settings will be different between weather stations.

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The wind at 5,000 feet AGL is southwesterly while the surface wind is southerly. This difference in direction is primarily due to

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Explanation

Above 2,000 feet AGL, wind flows along isobars. Below that altitude, friction with the earth’s surface deflects the wind.

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Convective circulation patterns associated with sea breezes arc caused by

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Explanation

During the day, land surfaces become warmer than the adjacent water surfaces. This warms the air above the land causing the air to rise. The rising air is replaced by the inland flow of cooler, denser air located over the water. As the warm air flows over

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How will frost on the wings of an airplane affect takeoff performance?

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Explanation

Frost disrupts the smooth airflow over the wing and can cause early separation of the airflow, resulting in a loss of lift.

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Every physical process of weather is accompanied by, or is the result of, a

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Explanation

Every physical process of weather such as heating, cooling, evaporation, and condensation, is caused by or is the result of, a heat exchange.

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A temperature inversion would most likely result in which weather condition?

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Explanation

Normally, temperature decreases with altitude. During an inversion, cooler air is trapped beneath a warmer layer of air. Therefore, temperature increases with altitude.

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The most frequent type of ground or surface-basal temperature inversion is that which is produced by

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Explanation

An inversion commonly forms on clear, cool nights when the ground radiates heat and cools faster than the overlying air.

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Which weather conditions should be expected beneath a low-level temperature inversion layer when the relative humidity is high?

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Explanation

Low-level temperature inversions normally occur in stable, smooth air, with poor visibility due to trapped pollutants which are commonly referred to as condensation nuclei. In addition, high humidity tends to cause formation of fog and low clouds.

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What is meant by the term “dewpoint”?

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Explanation

When air is cooled to its dewpoint, it can hold no more moisture, and is said to be saturated.

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The amount of water vapor which air can hold depends on the

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Explanation

The amount of moisture in the air primarily depends on the temperature. For example, warm air can hold more moisture than cool air.

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Clouds, fog, or dew will always form when

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Explanation

Condensation occurs when water vapor changes to liquid form. Examples are when vapor changes to clouds, fog, or dew.

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What are the processes by which moisture is added to unsaturated air?

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Explanation

Evaporation occurs when liquid water changes to water vapor. Sublimation is the changing of ice directly to water vapor. Both processes add moisture to the air.

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Which conditions result in the formation of frost?

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Explanation

When the dewpoint of the surrounding air is below freezing, and the collecting surface is at or below the dewpoint, water vapor sublimates directly into ice crystals or frost instead of condensing into dew.

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The presence of ice pellets at the surface is evidence that there

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Explanation

Due to a temperature inversion, a warm layer of air is aloft and keeps the rain in liquid forms. As the rain falls through colder air, it begins to freeze, finally turning into ice pellets. Ice pellets always indicate freezing rain at a higher altitude. I

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What measurement can be used to determine the stability of the atmosphere?

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Explanation

The stability of air refers to its resistance to displacement upward or downward; it is determined by the actual lapse rate. Lapse rate generally refers to the decrease in temperature with an increase in altitude. A high lapse rate tends to indicate unsta

Chapter 6.0 (1-20)

Question 1 of 1

Time Left

What causes variations in altimeter settings between weather reporting points?

Select the correct answer(s).

(0/0)

Explanation

The wind at 5,000 feet AGL is southwesterly while the surface wind is southerly. This difference in direction is primarily due to

Select the correct answer(s).

(0/0)

Explanation

Convective circulation patterns associated with sea breezes arc caused by

Select the correct answer(s).

(0/0)

Explanation

How will frost on the wings of an airplane affect takeoff performance?

Select the correct answer(s).

(0/0)

Explanation

Every physical process of weather is accompanied by, or is the result of, a

Select the correct answer(s).

(0/0)

Explanation

A temperature inversion would most likely result in which weather condition?

Select the correct answer(s).

(0/0)

Explanation

The most frequent type of ground or surface-basal temperature inversion is that which is produced by

Select the correct answer(s).

(0/0)

Explanation

Which weather conditions should be expected beneath a low-level temperature inversion layer when the relative humidity is high?

Select the correct answer(s).

(0/0)

Explanation

What is meant by the term “dewpoint”?

Select the correct answer(s).

(0/0)

Explanation

The amount of water vapor which air can hold depends on the

Select the correct answer(s).

(0/0)

Explanation

Clouds, fog, or dew will always form when

Select the correct answer(s).

(0/0)

Explanation

What are the processes by which moisture is added to unsaturated air?

Select the correct answer(s).

(0/0)

Explanation

Which conditions result in the formation of frost?

Select the correct answer(s).

(0/0)

Explanation

The presence of ice pellets at the surface is evidence that there

Select the correct answer(s).

(0/0)

Explanation

What measurement can be used to determine the stability of the atmosphere?

Select the correct answer(s).

(0/0)

Explanation

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