what do clouds have to do with weather? what is it? - a measure of the amount of water vapor in the...
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What do clouds have to do with
weather?
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What is it?
- A measure of the amount
of water vapor in the air.
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Relative Humidity-The percentage of water vapor in the air
compared to the maximum amount the air could hold
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Relative Humidit
y is measured using
a psychrometer
WET DRY
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How it works
:-If the relative humidity is high, the
water on the wet bulb will not change
much.-The relative Humidity can be found by
comparing the temperatures on a chart like
this one.
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How Clouds Form-Water vapor in the air becomes a liquid or ice crystals
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Condensation
-As air cools, the amount of water vapor it can hold
decreases.-Some of that water vapor condenses to
form a liquid.
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What is Dew Point?
-The temperature at which condensation begins
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To Condensation
-For water vapor to condense, tiny particles
must be present so the water has
a surface on which to
condense.-Salt crystals,
dust from soil, & smoke.
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Types of CloudsThree Main
Types-Cirrus
-Cumulus-Stratus
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Cloud Classificatio
n-Clouds are classified by their shape and altitude-Each type of
cloud is associated
with a different type
of weather
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Cirrus
-Wispy, feathery clouds
-Have feathery “hooked” ends
-Form only at high levels (above 6 km)-Made of ice crystals
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Stratus-Means “spread out”
-Usually cover most of the sky
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Cumulus
-Means “heap” or “mass”-Look like fluffy, rounded piles of cotton
-Usually indicate fair weather
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“-nimbus”-Means “rain”-As stratus clouds thicken, they may produce rain and would be called “nimbostratus”
-Cumulus clouds that are tall with flat tops
often produce thunderstorms and
are called “Cumulonimbus”
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Cirrocumulus
-Look like rows of cotton balls-Often indicate a storm is on the
way
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“alto-”
-Means “high”-Form between 2 and 6 km.
-Main types are altostratus and altocumulus.
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FoG
-Cloud that forms on or near the ground