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Be able to…
•Define a cloud
•Explain how clouds form
•Identify the ten main cloud types
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*
*Q: What did the rain cloud
where under his rain coat?
*A: Thunder wear!
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Clouds are droplets of water, or
tiny crystals of ice, or a mixture of
both:
*Visible indication of what is
going on in the atmosphere
*Adiabatic cooling is the most
important cloud forming
process
*Air rises and cools from
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*Takes about a million cloud droplets to form a single raindrop
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Forms when air cools to the dew point.
*Clouds are water vapor that
condenses and collects around
aerosols. (particles of dust, smoke,
salt particles, pollen, burning from
forest fires, automobiles, or ice
crystals)
*The flat cloud base shows where the
water vapor began to condense.
This height is called the
condensation level (CL or LCL)
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4 main precipitation types:
*Rain
*Snow
*Sleet
*Glaze or freezing rain
*Driest place on Earth – Arica,
Chile receives .03 inches of
rainfall per year.
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All main clouds are classified
on the basis of two criteria
*Form (puffy or flat)
*Height (low, middle, high)
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Horizontal air movement –
stable air
*clouds form in layers
*Stratiform clouds
Vertical air movement –
clouds grow more upward
*Unstable air
*Cumuliform clouds
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Clouds contain:
*Water droplets when the air is
above freezing
* Ice crystals and supercooled
water when air is below freezing
Virga – Latin for streak
*Rain frequently evaporating
before reaching the ground
*Or snow sublimating.
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Be able to…
•Define a cloud
•Explain how clouds form
•Identify the ten main cloud types