Transcript Warm Up

All Things Weather Wise
Weather Instruments, Pressure
Systems and Fronts
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What is air pressure?
What happens to the
molecules when air warms
up?
Why does air move out of a
filled balloon when you untie
the end?
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Why is it hot at the equator and cold
at the poles?
What is needed to create an area of
high pressure?
What causes low pressure?
What happens to air at the poles? At
the equator?
What is wind?
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What type of clouds are associated
with good weather?
How is weather described? List 7
factors.
How do clouds form?
Describe a convection current.
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What causes low pressure on the Earth’s
surface?
What type of weather is associated
with a cold front?
What is wind? What causes it? Which
way does air move?
What is the role of ozone in the
stratosphere?
What happens to temperature in the
troposphere?
What Is Weather?
…Conditions of the atmosphere at a
given place and time.
 Air pressure
 Temperature
 Wind speed, wind direction
 Cloud cover, type
 precipitation
Weather Instruments:
Anemometer
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Measures wind speed
Wind turns the cups;
faster wind turns cups
faster
Faster wind = higher
wind speed
Wind speed measured
in mph or kph
Weather Instrument:
Barometer
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Measures air pressure
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When air pressure
increases, the air pushes
down on the mercury,
which then rises in the
tube.
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Changes in air pressure
can help to forecast
weather
Wind Sock
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Wind fills the cone
shaped bag
Tells the direction of
the wind
Always name winds
by where they are
blowing FROM - A
southeast winds
blows from the
southeast
High Pressure System
 Cooler,
sinking air
 Creates generally
clear days, good
weather
 May be small
cumulus clouds, if
any
Low Pressure System
 Warmer,
rising
air
 Stratus clouds
form if there is
enough
moisture in the
air
 Drizzle or rain
may occur
Warm Front
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When a warm air mass overtakes a
cooler air mass
Warm air rises over cool air
Light to moderate, but steady rain at
frontal boundary
Temperature increases after front
passes
Warm Front
Cold Front
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Cold air mass overtakes warmer air mass
Cooler air nudges under warmer air
Heavy, short periods of showers at frontal
boundary
Temp drops!
Cold Front
And Just a Bit About Hurricanes
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Form in the tropics over water that is
greater than 79 degrees Fahrenheit
Gathers strength as it remains over sea
A storm must have winds of 75mph to be
considered a hurricane; otherwise, it’s
just a tropical storm or depression
As it makes landfall, storm weakens, but
can still have disastrous effects
Eye
Hurricane - A low
pressure system
where winds blow
counterclockwise
Warm Up
Draw a Venn diagram comparing warm
and cold fronts. Include at least two
differences and two similarities.
Warm vs. Cold Fronts
Warm
 Warm air rises
slowly over cold
 Stratus clouds
form
 Moderate
precip over a
long time
Both
•Change the
air temp
•Occur when
air masses
meet
•Happen over
land or water
•Can happen
anytime
Cold
 Warm air rises
quickly
 Cumulonimbus
 Thunderstorms
 can include
lightning and hail
and tornadoes