How are clouds born
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How are Clouds Born? PowerPoint PPT Presentation


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How are Clouds Born?. What type of air is the least dense?. Warm air is less dense than cold air. Moist air is less dense than dry air. The least dense air of all would be air that is __________ and __________. What type of air is the least dense?. Warm air is less dense than cold air.

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How are Clouds Born?

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How are clouds born

How are Clouds Born?


What type of air is the least dense

What type of air is the least dense?

  • Warm air is less dense than cold air.

  • Moist air is less dense than dry air.

  • The least dense air of all would be air that is __________ and __________


What type of air is the least dense1

What type of air is the least dense?

  • Warm air is less dense than cold air.

  • Moist air is less dense than dry air.

  • The least dense air of all would be air that is warm and moist.


How does density affect air movement

How does density affect air movement?

  • Cold, dry air is more dense and will ____.

  • Warm, moist air is less dense and will ____


How does density affect air movement1

How does density affect air movement?

  • Cold, dry air is more dense and will sink.

  • Warm, moist air is less dense and will rise.


What about temperature

What about temperature?

  • As we rise up through the troposphere temperature will _______.

  • Therefore a column of warm moist air rising will get colder as it gains altitude.

  • This column of air will also expand due to the fact that air molecules at higher altitudes are more spread apart (less influence by gravity).

  • Depending on the Relative Humidity of the air it could eventually cool until it reaches _________ Temperature.


What about temperature1

What about temperature?

  • As we rise up through the troposphere temperature will decrease.

  • Therefore a column of warm moist air rising will get colder as it gains altitude.

  • This column of air will also expand due to the fact that air molecules at higher altitudes are more spread apart (less influence by gravity).

  • Depending on the Relative Humidity of the air it could eventually cool until it reaches dewpoint Temperature.


Do the dew

Do the Dew!!

  • At dewpoint the air is ________ and can no longer hold more water vapor.

  • If ________ ________ are present, tiny water droplets will condense on them to form a cloud.

  • Once the water droplets grow in size and mass, they can drop to the earth as precipitation.


Do the dew1

Do the Dew!!

  • At dewpoint the air is saturated and can no longer hold more water vapor.

  • If condensation nuclei are present, tiny water droplets will condense on them to form a cloud.

  • Once the water droplets grow in size and mass, they can drop to the earth as precipitation.


And that s how clouds are born

And that’s how clouds are born!


Do now

Do Now

  • What is the Dew Point Temperature if the air temperature is 8 ˚ and the Relative Humidity is 51%?

  • Answer: -2 ˚


Do now1

Do Now

  • What is the Relative Humidity if The dry bulb is 16 ˚ and the dew point is 4 ˚?

  • Answer: 45%


Do now2

Do Now

  • What is the Relative humidity of the following air mass? Dry Bulb=26˚; Dew Point=11 ˚?

  • Answer: 39%


Do now3

Do Now

  • What is the Relative humidity of the following air mass? Dry Bulb=26˚; Dew Point=18 ˚?

  • Answer: 64%


Do now4

Do Now

  • What is the Relative humidity of the following air mass? Dry Bulb=26˚; Dew Point=25 ˚?

  • Answer: 92%


Do now5

Do Now

  • What happens to relative humidity as the difference between air temperature and dew point temperature gets smaller?

  • Answer: Relative Humidity increases.


Do now6

Do Now

  • What happens to the difference between air temperature and dew point temperature as air descends? (Use the cloud base altitude chart)

  • Answer: It increases.


Do now7

Do Now

  • Is a descending air mass becoming more or less humid?

  • Answer: Less Humid.


Orographic effect

Orographic Effect


Orographic effect1

Orographic Effect

  • A mountain can force air to rise.

  • As the air rises it cools and expands.

  • When the air reaches dew point temperature clouds form ( if condensation nuclei are present).

  • As the air moves past the mountain it will sink and become dry due to an increase in temperature.


Orographic effect2

Orographic Effect

  • The moist side of the mountain is called the windward side, and will have a lot of precipitation throughout the year.

  • The dry side of the mountain is called the leeward side and will often be the site of deserts.


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