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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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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.



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 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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