How are Clouds Born?
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How are Clouds Born? How are Clouds Born?
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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. - PowerPoint PPT Presentation
Transcript of How are Clouds Born?
How are Clouds Born?How are Clouds Born?
What type of air is the least What type of air is the least dense?dense?
Warm air is less dense than cold air.Warm air is less dense than cold air. Moist air is less dense than dry air.Moist air is less dense than dry air. The least dense air of all would be air that is The least dense air of all would be air that is
__________ and ____________________ and __________
What type of air is the least What type of air is the least dense?dense?
Warm air is less dense than cold air.Warm air is less dense than cold air. Moist air is less dense than dry air.Moist air is less dense than dry air. The least dense air of all would be air that is The least dense air of all would be air that is
warmwarm and and moist.moist.
How does density affect air How does density affect air movement?movement?
Cold, dry air is more dense and will ____.Cold, dry air is more dense and will ____. Warm, moist air is less dense and will ____Warm, moist air is less dense and will ____
How does density affect air How does density affect air movement?movement?
Cold, dry air is more dense and will Cold, dry air is more dense and will sink.sink. Warm, moist air is less dense and will Warm, moist air is less dense and will rise.rise.
What about temperature?What about temperature?
As we rise up through the troposphere As we rise up through the troposphere temperature will temperature will _______._______.
Therefore a column of warm moist air rising will Therefore a column of warm moist air rising will get colder as it gains altitude.get colder as it gains altitude.
This column of air will also expand due to the fact This column of air will also expand due to the fact that air molecules at higher altitudes are more that air molecules at higher altitudes are more spread apart (less influence by gravity).spread apart (less influence by gravity).
Depending on the Relative Humidity of the air it Depending on the Relative Humidity of the air it could eventually cool until it reaches _________ could eventually cool until it reaches _________ Temperature.Temperature.
What about temperature?What about temperature?
As we rise up through the troposphere As we rise up through the troposphere temperature will temperature will decrease.decrease.
Therefore a column of warm moist air rising will Therefore a column of warm moist air rising will get colder as it gains altitude.get colder as it gains altitude.
This column of air will also expand due to the fact This column of air will also expand due to the fact that air molecules at higher altitudes are more that air molecules at higher altitudes are more spread apart (less influence by gravity).spread apart (less influence by gravity).
Depending on the Relative Humidity of the air it Depending on the Relative Humidity of the air it could eventually cool until it reaches could eventually cool until it reaches dewpointdewpoint Temperature.Temperature.
Do the Dew!!Do the Dew!!
At dewpoint the air is ________ and can no At dewpoint the air is ________ and can no longer hold more water vapor.longer hold more water vapor.
If ________ ________ are present, tiny If ________ ________ are present, tiny water droplets will condense on them to water droplets will condense on them to form a cloud.form a cloud.
Once the water droplets grow in size and Once the water droplets grow in size and mass, they can drop to the earth as mass, they can drop to the earth as precipitation.precipitation.
Do the Dew!!Do the Dew!!
At dewpoint the air is At dewpoint the air is saturatedsaturated and can no and can no longer hold more water vapor.longer hold more water vapor.
If If condensation nucleicondensation nuclei are present, tiny are present, tiny water droplets will condense on them to water droplets will condense on them to form a cloud.form a cloud.
Once the water droplets grow in size and Once the water droplets grow in size and mass, they can drop to the earth as mass, they can drop to the earth as precipitation.precipitation.
And that’s how clouds are born!And that’s how clouds are born!
Do NowDo Now
What is the Dew Point Temperature if the air What is the Dew Point Temperature if the air temperature is 8 temperature is 8 ˚̊ and the Relative Humidity and the Relative Humidity is 51%?is 51%?
Answer: -2 Answer: -2 ˚̊
Do NowDo Now
What is the Relative Humidity if The dry bulb What is the Relative Humidity if The dry bulb is 16 is 16 ˚̊ and the dew point is 4 and the dew point is 4 ˚̊??
Answer: 45%Answer: 45%
Do NowDo Now
What is the Relative humidity of the What is the Relative humidity of the following air mass? Dry Bulb=26following air mass? Dry Bulb=26˚; ˚; Dew Point=11 ˚?Dew Point=11 ˚?
Answer: 39%Answer: 39%
Do NowDo Now
What is the Relative humidity of the What is the Relative humidity of the following air mass? Dry Bulb=26following air mass? Dry Bulb=26˚; ˚; Dew Point=18 ˚?Dew Point=18 ˚?
Answer: 64%Answer: 64%
Do NowDo Now
What is the Relative humidity of the What is the Relative humidity of the following air mass? Dry Bulb=26following air mass? Dry Bulb=26˚; ˚; Dew Point=25 ˚?Dew Point=25 ˚?
Answer: 92%Answer: 92%
Do NowDo Now
What happens to relative humidity as the What happens to relative humidity as the difference between air temperature and dew difference between air temperature and dew point temperature gets smaller?point temperature gets smaller?
Answer: Relative Humidity increases.Answer: Relative Humidity increases.
Do NowDo Now
What happens to the difference between air What happens to the difference between air temperature and dew point temperature as temperature and dew point temperature as air descends? (Use the cloud base altitude air descends? (Use the cloud base altitude chart)chart)
Answer: It increases.Answer: It increases.
Do NowDo Now
Is a descending air mass becoming more or Is a descending air mass becoming more or less humid?less humid?
Answer: Less Humid.Answer: Less Humid.
Orographic EffectOrographic Effect
Orographic EffectOrographic Effect
A mountain can force air to rise.A mountain can force air to rise. As the air rises it cools and expands.As the air rises it cools and expands. When the air reaches dew point temperature When the air reaches dew point temperature
clouds form ( if condensation nuclei are clouds form ( if condensation nuclei are present).present).
As the air moves past the mountain it will As the air moves past the mountain it will sink and become dry due to an increase in sink and become dry due to an increase in temperature.temperature.
Orographic EffectOrographic Effect
The moist side of the mountain is called the The moist side of the mountain is called the windward side, and will have a lot of windward side, and will have a lot of precipitation throughout the year.precipitation throughout the year.
The dry side of the mountain is called the The dry side of the mountain is called the leeward side and will often be the site of leeward side and will often be the site of deserts.deserts.
