Bell Ringer - Hammer Science€¦ · Cumulus Clouds • Fair weather cumulus have the appearance of...
Transcript of Bell Ringer - Hammer Science€¦ · Cumulus Clouds • Fair weather cumulus have the appearance of...
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Bell Ringer
1. What is humidity?
2. What kind of clouds are there outside
right now?
3. What happens to air when it gets colder?
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Cloud Notes
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What are clouds?
• A cloud is made up of tiny
water droplets and/or ice
crystals, a snowflake is a
collection of many ice
crystals, and rain is just
liquid water.
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How do Clouds form?
To make a cloud, three ingredients are necessary:
1. Water vapor
2. A way to cool air to the dew point
3. A solid particle for the water vapor to stick to
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Dew point
• The temperature to which air must be cooled
in order to be saturated with water (100%
relative humidity). (Different size beakers)
• As air gets colder, it condenses and gets
smaller, which means it can’t hold as much
water.
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Dew Point• Depends on two
things:
– Temperature
– Relative
humidity
– (Also pressure,
but don’t worry
about that for
now)
• Frost point: Same
thing, but it’s cold
enough to
freeze…
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Fog
• Normally the dew point
is reached as altitude
increases.
• Sometimes the dew
point is right next to the
surface, and there are
enough particulates in
the air, which makes
fog.
• Fog = Cloud near the
surface.
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Cloud Names
• Names of specific types of
clouds are created by
combining the name of the
cloud's shape with the
name of the cloud's height.
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Clouds - Shape
There are 3 main shapes of clouds:
• Cumulus or fluffy clouds – like cotton
• Stratus or layered clouds – like blanket
• Cirrus or thin feathery clouds
CirrusStratusCumulus
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Clouds - Height
There are 3 different zones clouds can form in:
• Low – These typically have the prefix ‘Stratus’ (I
know, confusing).
• Medium – These typically have the prefix ‘Alto’
meaning ‘medium’.
• High – These typically have the prefix ‘Cirrus’
(Again, confusing, I know).
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Mixing shape and height
• E.g. Stratocumulus =
Strato (low) +
Cumulus (Fluffy
bunches)
• E.g. Altostratus = Alto
(medium) + Stratus
(Blanket like)
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Low level clouds
• Stratus – Thick blanket
• Stratocumulus – Puffy
• Nimbostratus – Blanket, dark gray,
produces rain
• Fog
• If the clouds are at or below Mt. Timp,
= low level clouds.
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Medium level clouds
• Altostratus – Thick blanket
• Altocumulus – Puffy
• If cumulus clouds are about the size of
your thumbnail when held out at arm
length, it’s medium level. Any bigger =
low level. Smaller = High level.
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High level clouds
• Cirrostratus – Thick layered
• Cirrocumulus – Puffy
• Contrails – Made by planes
• Cirrus – Very thin wispy
• If it’s about to rain, or has rained, stratus
clouds are most likely at low level. If you
can barely see the sun, like looking
through a bottle = mid level. If you can still
see the sun pretty much = high level.
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Special Clouds
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StratusThe word stratus comes from the
Latin word that means "to spread
out." Stratus clouds are
horizontal, layered clouds that
stretch out across the sky like a
blanket.
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Stratus Clouds
Low clouds are of made of water
droplets. However, when temperatures
are cold enough, these clouds may also
contain ice particles and snow.
“Overcast”
These can often turn into rain producing
nimbostratus clouds.
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Stratus Clouds
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Stratus Clouds
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Stratus Clouds
• Stratus Clouds stretch across
the sky in low, large flat
layers. They resemble fog,
but they do not reach the
ground. They often produce
mist or drizzle.
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Cumulus Clouds
• Fair weather cumulus
have the appearance
of floating cotton and
have a lifetime of 5-40
minutes. The word
cumulus comes from
the Latin word for a
heap or a pile.
Cumulus clouds are
puffy in appearance.
They look like large
cotton balls.
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Cumulus Clouds
• Harmless fair weather
cumulus clouds can later
develop into towering
cumulonimbus clouds
associated with powerful
thunderstorms.
• Spaced out because turbulent
air creates pockets of upward
and downward air currents.
https://www.youtube.com/wat
ch?v=Qu7mcKZgqv0
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Fair Weather Cumulus
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Cumulonimbus
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Cumulonimbus• These clouds produce heavy
thunderstorms in summer.
• Cumulonimbus clouds may extend upward for hundreds of meters.
• When they grow to the top of the troposphere they flatten into an anvil shape.
• https://www.youtube.com/watch?v=0YatiDf9A8A
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Lots of heat, lots of
upward moving air.
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Lenticular Clouds
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Lenticular Clouds
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