Transcript Factors of Weather PPT

Essential Question:
What factors influence
weather?
Standards:
S6E4a. Demonstrate that land and water absorb and lose heat at
different rates and explain the resulting effects on weather
patterns.
S6E4b. Relate unequal heating of land and water surfaces to
form large global wind systems and weather events such as
tornados and thunderstorms.
S6E4c. Relate how moisture evaporating from the oceans
affects the weather patterns and weather events such as
hurricanes.
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Activating Strategy:
“A Perfect Day”
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Activating Strategy:
“A Perfect Day”
Have you experienced a “perfect day” like Peep,
Chirp, and Quack? Describe your experience.
Did everyone experience the “perfect day” as you
did? Why or why not?
What do you think has an influence on our “perfect
days”?
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Weather refers to the state of the
atmosphere at a specific time
and place (short periods of time)
Climate is the average weather
of an area over a long period of
time
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The interaction of
water, the sun, and
air cause weather.
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Turn to an elbow partner and
describe what you have learned
so far about the interaction of
water, the sun, and air on Earth.
[Hint: water cycle, land/sea breeze]
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The Sun provides the Earth’s energy.
This energy causes the evaporation
of water from the atmosphere which
eventually falls back to Earth as
precipitation.
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The Sun’s energy also heats the Earth’s
surface, which then heats the air. Due
to the unequal heating of the Earth’s
surface, heat is redistributed by air and
water currents.
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Review of Concepts:
https://www.youtube.com/watch?v=lrP
S2HiYVp8
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As you have
experienced, weather
changes frequently.
What factors cause
weather to change?
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A Few of the Factors of Weather
• Air Pressure
•Air Temperature
•Wind
•Humidity
• Clouds
• Precipitation
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Use the Factors of Weather Graphic
Organizer to Take Notes
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Air temperature, wind, and
humidity are all connected
to air pressure.
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Air Temperature
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Air Temperature
Temperature is a measure of
the average amount of motion
of molecules.
Based on our previous
lessons, does warm air or
cold air have faster moving
molecules?
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The temperature of a substance is related
to the speed of the substance’s particles.
http://www.bgfl.org/bgfl/custom/resources_ftp
/client_ftp/ks3/science/changing_matter/chan
gingmatter.swf
As the temperature of a substance increases, the
particles in the substance move faster causing
lower density and lower pressure.
As the temperature of a substance decreases,
the particles in the substance move slower
causing higher density and higher pressure.
Lower Temperature
Higher Temperature
Lower Particle Movement
Higher Particle Movement
Higher Density
Lower Density
Higher Pressure
Lower Pressure
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Infrared Images of Surface
Temperature on the Earth
Notice the land specifically in the animation
showing a 5 year average of surface
temperatures. What concept does this
demonstrate?
http://www.classzone.com/books/earth_sci
ence/terc/content/visualizations/es1705/es
1705page01.cfm?chapter_no=visualization
Land heats and cools faster than water
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Warm air temperature =
Warm Feeling Weather
Cold air temperature =
Cold Feeling Weather
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Wind
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Wind is air
moving in a
specific
direction.
What determines the
direction of wind?
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In which direction would the wind
move below.
Higher Temperature
faster moving particles
Lower Temperature
slower moving particles
Lower Density
Higher Density
Lower Pressure
Higher Pressure
How does
wind
influence
weather?
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Wind helps
redistribute the
Earth’s heat.
Wind can make the
weather in an area
cooler or warmer.
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Turn to a seat
partner and
describe a time you
have experienced
when the wind has
influenced the
weather.
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Formative Assessment Check:
On a sheet of paper…
Identify the difference between
weather and climate
Describe how temperature and
wind affect weather.
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Heat evaporates water into
the atmosphere.
Where does it go?
Water vapor molecules fit
into spaces among the
molecules that make up air.
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Remembering the Water Cycle
Water
Vapor
Molecules
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Humidity
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Humidity is the amount of
water vapor present in the air.
http://commons.wikimedia.org/w/index.php?title=Fi
le%3AThe_Water_Cycle_Watering_the_Land.ogv
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Humidity
Air doesn’t always contain the
same amount of water vapor.
More water vapor can be present
when the air is warm than when it
is cool. But Why???
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Humidity
Think about it…what is happening to the
movement of particles when the
temperature is warm?
In warmer temperatures, the particles move
faster and don’t easily come together.
In cooler temperatures, slower moving
particles allow water vapor molecules to
stick together and form water droplets of
liquid water (condensation)
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How then is Humidity
connected to Air Pressure?
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Cooler temperatures have
lower pressure (density) and
lower humidity because the
water vapor condenses faster.
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How does Humidity
influence weather?
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How does Humidity
influence Weather?
Low Humidity is when the air
feels dry.
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How does Humidity
influence Weather?
High Humidity is
when the air feels
damp, “sticky” or
“muggy”.
High Humidity can
make the weather feel
warmer than the
actual temperature.
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Would you prefer your
“perfect day” weather to
have low humidity or
high humidity? Why?
Share with an elbow partner.
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Clouds
Turn to a seat partner and
discuss how a cloud forms.
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A cloud forms
when warm air
rises,
expands,
cools and
condenses.
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Clouds
How might clouds
influence weather?
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How do Clouds Influence
the Weather?
• Clouds prevent the sun’s radiation
from hitting the Earth’s surface;
therefore, causing a cooling effect
• Clouds can also trap some of the
Earth’s heat as well as reflect some
of the solar radiation
• Clouds are a source of precipitation
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Formative Assessment
Check
Are clouds good or bad
for weather? Explain.
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Precipitation
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Precipitation
• Precipitation occurs
when water droplets combine
and grow large enough to fall to
Earth.
• Air temperature determines
whether water forms rain, snow,
sleet or hail
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Precipitation
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Describe a time you have
experienced when precipitation
has affected the weather.
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Study Jams:
Weather and Climate
http://studyjams.scholastic.com/stud
yjams/jams/science/weather-andclimate/weather-and-climate.htm
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Summarizer: 5 – 3 – 1
• Identify 5 factors of weather
• Describe 3 examples of how
these factors affect weather
• Identify 1 reason weather is not
the same everywhere
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