Winds - Cloudfront.net
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Winds
Wind
The horizontal movement of air from areas of
high air pressure to low air pressure
Difference in air pressure is due to unequal
heating from the sun
H
Cold Air
High Pressure
More Dense
L
Warm Air
Low Pressure
Less Dense
Molecules like to move from a crowded area
to a less crowded area
Isobars mark areas with the same air pressure
Measuring Wind
Wind Speed: Use an anemometer.
Wind Direction: Use a wind vane or wind
sock.
L
Naming Wind
The name of the wind tells you where the
wind is coming from.
Ex: North wind comes from North (to South)
N
H
L
W
E
S
Ex: West wind blows from the West to the East.
N
W
A. What is the name of Each wind
E
B. What Direction is the wind blowing?
S
A.
Northwest Wind
B.
Southeast wind
A.
West Wind
B.
East wind
A.
Northeast Wind
B.
Southwest wind
A.
South Wind
B.
North wind
Local Winds
Winds that blow over short distances
Caused by unequal heating of Earth’s surface
within a small area.
Ex: land breeze and sea breeze
Sea Breeze
Land and the air around land warm up
faster than water
Wind blows toward land from the
water
Land Breeze
Land also cools faster than water
At night, a wind blows toward the water
from the land
Global Winds
Winds that blow over long distances due to
unequal heating of Earth’s surface (more heat
at equator)
Polar Easterlies
Wind belts that extend
from the poles to 60°
latitude
Formed from cold
sinking air moving from
the poles creating cold
temperatures
Westerlies
Wind belts found
between 30° and 60°
latitude
Flow towards the poles
from west to east
carrying moist air over
the Unites States
Trade Winds
Winds that blow from
30° almost to the
equator
Called the trade winds
because of their use by
early sailors
Doldrums
Located along the
equator where no
winds blow because
the warm rising air
creates and area of low
pressure
Horse Latitudes
Occur at about 30°
north and south of the
equator where the
winds are very weak
Most deserts on the
Earth are located here
because of the dry air
Coriolis Effect
A “curving of the winds” due to the rotation of
Earth
Jet Stream
High speed winds located 10km above Earth’s
surface that travel in a wavy path