Transcript Weather Power Point (Harris)

By:
Drew Harris
What is atmosphere? Atmosphere is the air that
surrounds Earth. It was formed millions of years ago
by volcanoes. Carbon dioxide absorbs heat and helps
to heat the planet. This helps to heat the planet.
Water vapor, or the gas state of water, also does this.
That is how humid areas like Buena Vista are very
hot. Humidity is the amount of water vapor in air.
Air pressure
Every day air particles press down on the surface. This is
called air pressure. The air particles near the surface are
closer together and tighter than most. They loosen the higher
they go. Therefore, the air pressure is less the higher you go.
Layers of the Atmosphere
The Troposphere
The atmosphere has four layers. They are the
troposphere, stratosphere, mesosphere, and
thermosphere.
The troposphere is the closet layer to the surface. We
breathe its air everyday. It has most bad weather in it. In this
layer air temperature decreases with height.
The second layer from earth is the stratosphere.
Some airplanes that fly long distances fly here to
be above most bad weather. This area contains
most of the atmosphere’s ozone and protects us
from the sun’s harmful rays. Temperatures in the
stratosphere increase with height.
The third layer from the earth is the
mesosphere. It is the coldest layer of the
atmosphere. Here temperature decreases with
height.
The thermosphere is the layer farthest from the
surface. It is the hottest layer. Temperatures here
increase quickly with height. In fact, it can reach
thousands of degrees Celsius.
Almost all of the sun’s energy never gets to
earth. 3/10 of it is reflected into space. Another
3/10 is used to warm the air. The 4/10s left is used
to warm the land and water. The atmosphere traps
the heat like a greenhouse. Without the
greenhouse effect, earth would reflect most of the
sun’s energy and be too cold to have life.
If you could see air from space you would
see large clumps of it forming, moving, and
changing. These bodies of air are called air
masses. Air masses have two properties that
change depending on what it is over. They are
humidity and temperature. Moist ones form
over water. Ones that form over land are
usually dry. Air masses that form near the
poles are cold. If they form near the equator
they are hot.
When two air masses meet it is called a front.
That’s because they don’t mix. They form a border.
Most weather happens by fronts. A cold front forms
when a cold air mass catches up with a warm air mass.
It pushes the warm air up. Thunderstorms usually
occur along a cold front. A cold front is represented
by a line and triangles on a map. Warm fronts occur
when warm air masses catch up with cold air masses.
The warm air mass pushes the cold air mass up. The
temperature usually becomes warmer. Warm fronts
are represented by a line and half circles.
Sometimes a front stops moving.
These are stationary fronts. They cause
high amounts of snow. They also cause
floods.
Meteorologists are scientists who study weather
conditions. They have created tools for developing
them. Thermometers measure temperature. Air
pressure is measured by a barometer. A
hygrometer measures humidity in an area.
Scientists measure wind speed using
anemometers. Wind direction is found using
weather vanes or wind socks. A rain gauge is used
to measure the amount of rainfall.
(Pictures of these are in your Interactive Notebook)
By watching and measuring weather conditions,
scientists keep track of all moving air masses. They
record measurements on charts and maps and
then predict the weather. A weather map can be
any size. Big ones can cover countries, small ones
can cover states or smaller areas. A weather map
uses symbols to show the weather.
There are many types of clouds. A few of them are
Cirrus, Cumulonimbus, Cumulus, Stratus,
Stratocumulus, and Altocumulus. Cirrus are high
clouds that are made up of ice crystals. The wind
stretches them into long horseshoe or feather shapes.
They usually go with cool, fair weather.
Cumulonimbus clouds are large, dark rain clouds
that are usually in cold fronts and bring thunder.
Cumulus clouds are puffy, cotton ball like clouds
that form by condensing, or water turning from a gas
to liquid, at the middle layer of clouds. They are
found on clear, warm days.
Stratus clouds are a flat layer of low clouds. They
usually bring rain and occur along warm fronts.





Water cycle- recycling of water.
Evaporation- a liquid changing to a gas.
Dew point- the temperature in which water
vapor condenses.
Precipitation- rain, snow, sleet, or hail.
Moisture- the small amount of liquid that
causes dampness.














Do we drink the same water that was on earth millions of years
ago?
What form does water take on our earth?
What happens daily to water on earth?
How does water change from a solid to a liquid to a gas?
How does water change from a gas to a liquid to a solid?
How are clouds formed?
What is the water cycle?
What are forms of precipitation?
Why do we use the following instruments: rain gauge, hygrometer,
thermometer, anemometer, barometer, and wind vane.
How do we distinguish between weather and climate?
Why do we use symbols on a weather map and what do they
mean?
How do we know a weather forecast is accurate?
Where does water go in a drought?
Do we drink the same water that the dinosaurs drank?





The weather changes every day.
Water can be liquid or solid.
Water disappears.
Weather occurs daily.
Temperatures affect water.
Videos
Cloud Types Song Videos
http://cleanvideosearch.com/media/action/yt/watch?
videoId=u3QwLYfgwP0
http://cleanvideosearch.com/media/action/yt/watch?
videoId=ur0k7UDrrvg
Weather Instruments Song Video
http://cleanvideosearch.com/media/action/yt/watc
h?videoId=kBfaAN_tWW4