What is this object? Anemometer, instrument used to measure the
wind What purpose of an Anemometer? Measure the wind speed How does
it work? Multiply the circumference by the revolutions Today you
are going to make one!
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Open Calculating Wind Speed You will collect data during class
and calculate your wind speed as homework
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Open Atmospheric Movement and Fronts Lab
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Stay in control!!!!!!!!
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Why is burning the paper necessary? The burning paper heats the
air and removes the oxygen. The paper will burn until the oxygen is
used or the paper in consumed. The air then warms then cools as the
fire go out. Because there is less air in the jar now, it exerts
less pressure. When the temperature inside and outside of the
bottle is the same, the air pressure outside the bottle pushes the
balloon inside. How does this demonstration relate to atmospheric
patterns and weather? If the temperature of the air changed, the
pressure of the sir also changes. Heating a constant volume of air
causes the pressure of the air to increase. If the air is cooled,
the pressure decreases. This pattern is seen in high and low
pressure areas, convection, and air masses.
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Copy what is in Yellow
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0 o Equator 30 o S 60 o S 90 o S 30 o N 60 o N90 o N More
Direct Sun Hot
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Forms high in the upper Troposphere between two air masses of
different temperatures Higher temperature difference = faster speed
Due to the Coriolis Effect, it flows around air masses. Polar Jet:
It dips southward when frigid polar air masses move south. It tends
to stay north in the summer months
Abnormally high surface ocean temperatures off the coast of
South America Causes unusual weather patterns across the globe
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A strong surface current Begins at the tip of Florida Flows up
the eastern coastline of the U.S. Crosses the Atlantic Ocean Causes
warmer climate in NW Europe
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When convection and winds cause air masses to move, they bump
into one another. The area where two air masses meet is called a
front. Most severe weather occurs near frontal boundaries.
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Draw this
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Stationary Front: Warm and cool air masses that are not strong
enough to move one another Sits still for a long period of
time
Air pressure is measured with a barometer in millibars.
Millibars are represented by connected lines of equal pressure.
This is a lot like the topographic map lines. The closer together
the lines are, the faster the wind speed. The farther apart the
lines are, the slower the wind speed.
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The Sun heats the water and land every day. Land heats up
rapidly, but cools off rapidly. Desert Water heats up slowly, but
cools off slowly. Swimming at night The heat retained by the oceans
is what keeps our planet insulated.
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The heating and cooling of water and land produces land breezes
and sea breezes. High pressure moves toward low pressure, pushing
the warm air upward. As warm air rises, cooler air moves in and
replaces it.
Using the notes we just took answer theses questions in one
complete sentence, at the bottom of your page Why does the Earth
have wind and ocean currents? How do global patterns of atmospheric
movement affect local weather?
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Follow Directions Complete Handout and Turn In
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With your shoulder partner, sort the cards into 6 groups of
3
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Weather maps are used to show current weather conditions in an
effort to predict future weather conditions. You need to know what
each symbol means and how to interpret them to forecast the
weather.
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Cold, dense air is moving toward warm, less dense air. The warm
air is pushed up to cool and form clouds as the cooler air replaces
it. The air on the front side of the boundary line is warmer than
the air on the back side of the boundary line. Cold Fronts are
usually fast moving and bring stormy weather and heavy
precipitation followed by clearing skies and higher pressure.
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Warm air is moving toward cold air. The warm, less dense air
slides over the cold, more dense air. The air on the front side of
the boundary line is cooler than the air on the back side of the
boundary line. Warm Fronts usually move slowly and bring steady
rain or snow over many days.
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These fronts occur when neither the cool or warm air masses are
strong enough to replace each other. Stationary Front tend to stay
in an area for a long period of time, often bringing precipitation
and clouds.
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Cooler, dense air close to the surface of the Earth. Surrounded
by winds flowing in a clockwise direction. High pressure Usually
brings dry conditions and fair skies.
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Lets practice. Remove the lid from the bottle. Now, replace the
lid. What direction did you turn the lid to tighten it? Did the lid
move up or down? This is a way to remember high pressure.
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Warmer, less dense air above the Earths surface Surrounded by
winds moving in a counterclockwise direction. Low pressure
Associated with the formation of storms.
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Lets practice. Remove the lid from the bottle. What direction
did you turn the lid to loosen it? Did the lid move up or down?
This is a way to remember low pressure.
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With your shoulder partner complete the handout using the
laminated maps Switch
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Follow the directions Work with your group Due at the end of
class Group Jobs 1. Researcher 2. Tracer 3. Key Person 4.
Director
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Study your spiral Write Test on your warm up log After the Test
STAY QUEIT You may read, work on homework, or get on the computer
If we have time I will check your grades after the test