Transcript Weather Powerpoint, Day 1

BRAINPOP VIDEO
http://www.brainpop.com/science/weather/weather/
The weather forecast that helped
you plan activities
for this week was
probably made by a
meteorologist.
A meteorologist is
a person who studies
the weather.
Meteorologists need many kinds of
data before the weather can be
predicted.
When you step outdoors, the air
temperature may be the first weather
condition you notice. In fact, you probably
dressed a certain way to be comfortable at
that temperature. If the
air temperature is
around 15°C you might
wear a sweater.
ATMOSPHERE
• The atmosphere is the
thin layer of air that
surrounds the earth.
• The troposphere is the
layer that is closest to
the earth. This is where
most weather occurs.
• The stratosphere is the
layer right above the
troposphere and is just
above where most
weather occurs.
AIR MASS
• An air mass is a large
body of air that has
about the same
temperature and
moisture throughout.
• An air mass forms
when a large body of
air stays in the same
place for several days.
HUMIDITY
Humidity is the amount of water vapor in the air. Which means the higher
the number, the more water vapor there is in the air. This means storms are
near. The lower the humidity number means there is less chance of rain
because there is not enough water vapor in the air to form clouds.
FRONTS
A cold weather front is
defined as the changeover
region where a cold air mass
is replacing a warmer air
mass. Cold weather fronts
usually move from northwest
to southeast. The air behind
a cold front is colder and
drier than the air in front.
When a cold front passes
through, temperatures can
drop more than 15 degrees
within an hour.
FRONTS
A warm weather front is
defined as the changeover
region where a warm air
mass is replacing a cold air
mass. Warm fronts usually
move from southwest to
northeast and the air behind
a warm front is warmer and
moister than the air ahead of
it. When a warm front
passes, the air becomes
noticeably warmer and more
humid than it was before.
WEATHER MAP
Meteorologist place all
of their data that they
collect on to a weather
map. By means of certain
symbols, a single weather
map can indicate
atmospheric conditions
above a large portion of
the earth's surface.
THERMOMETER
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•
•
Thermometers measure air
temperature.
Thermometers work because
matter expands when heated.
Most thermometers are closed
glass tubes containing liquids
such as alcohol. When air
around the tube heats the
liquid, the liquid expands and
moves up the tube.
A scale that shows the
temperature is on, or attached
to, the tube.
BAROMETER
• A barometer
measures air pressure.
• Air pressure presses
down on the mercury
forcing it up the glass
tube.
• There is a scale
attached to the glass
tube.
ANEMOMETER
• An anemometer, like the
one shown in the picture,
measures wind speed.
• The cups catch the wind,
turning a dial attached to
the instrument. The dial
shows the wind speed.
INDEPENDENT PRACTICE