Download Wind and weather

NC Essential Standard 7.E.1.5: Explain
the influence of convection, global winds
and the jet stream on weather and climatic
conditions.
= the condition of Earth’s atmosphere
at a particular time and place.
WIND is an important part of weather.
= air that moves horizontally,
or parallel to the ground.
Air pressure can differ place to place at the
same altitude.
Uneven heating of the Earth’s surface causes
such pressure differences and causes wind.
Wind moves from an area of HIGH PRESSURE
to and area of LOW PRESSURE.
1) Sunlight heats an area of the ground 
ground heats the air  warm air rises  area of
low pressure forms.
Wind moves from an area of HIGH PRESSURE
to and area of LOW PRESSURE.
2) Sunlight heats another area of the ground
less strongly  Cooler, denser air sinks  Area
of high pressure forms.
Wind moves from an area of HIGH PRESSURE
to and area of LOW PRESSURE.
3) Air moves as wind across the surface, from
higher toward lower pressure.
Small pressure differences cause a little wind.
LARGE pressure differences cause STRONG
wind.
Varies; some die out quickly, & others are global.
Global winds travel 1000’s of kilometers in
steady patterns and can last for weeks.
Global winds are caused by uneven heating
between the equator and the north and south
poles.
Is the area of low pressure created in the
equator or the poles?
Concentrated sunlight near the equator heats the
surface to a high temperature…warm air rises and
leaves an area of low pressure behind.
Is the area of high pressure created in the
equator or the poles?
Sunlight is more spread out at the poles (less heat
energy) and so the air is cooler and denser. This air
sinks and creates an area of high pressure.
= Describes how Earth’s rotation steers winds and
surface ocean currents.
-Causes freely moving objects to appear to move
to the right in the Northern Hemisphere and to the
left in the Southern Hemisphere.
-The objects are moving straight, but the Earth is
rotating beneath them, so they seem to curve.
If an airplane flies 500 miles due north, it will not
arrive at the city that was due north of it when it
began its journey.
Over the time it takes the airplane to fly 500 miles,
that city moved, along with the Earth it sits on.
The airplane will therefore arrive at a city to the
west of the original city (in the Northern
Hemisphere), unless the pilot compensates for the
change by also veering north.
Coriolis Effect Video 1
1) Get with your 3:00 appointment for this activity.
2) Predict in which direction a straight line will turn
when drawn from top to bottom on a page spinning
clockwise.
3) Predict in which direction a straight line will turn
when drawn from top to bottom on a page spinning
counter-clockwise.
4) Draw your predictions in the lab section of your
notebook.
Because the Coriolis effect causes global winds to
curve, they cannot flow directly from the poles to
the equator (high to low pressure).
Instead, they travel along global wind belts that
are separated by calm regions.
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Low-pressure zone near the equator
Warm air rises to the top of troposphere, then
spreads outward toward the poles.
Rising, moist air produces clouds & heavy rain.
Hottest months = heavy evaporation = tropical
storms
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High-pressure zones located about 30° north
and 30° south of the equator.
Warm air traveling away from the equator cools
and sinks.
Typically clear and dry weather.