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Global Winds
Global Winds
 Winds are named for the direction from which they blow, not where
they are going
 Winds blowing from the west would be called
_______________________
 What would winds from the east be called?
 _______________________
 Two main factors in wind direction:
 Rotation of the earth on its ________
 Location of high and low pressure air masses
 Air flows from an area of high pressure to
low pressure are called
____________________________
 _________________- areas of calm wind (at
the Equator for example)
The Coriolis Effect
 The curving of winds is caused by the rotation of the Earth on its axis_________ in the northern hemisphere, _________ in the southern
hemisphere
 Wind originating in _______ latitudes moves ____________ and
leaves an area of faster moving air and enters a zone where the air is
not moving so fast.
 This faster moving air curves right since it is moving faster than the air
at the location it’s entering
 This process is __________________ in the southern hemisphere.
The Jet Stream
 Stream of fast moving air that happens where the troposphere meets
the stratosphere
 Runs at _______________________
 Mostly located at
__________________________
 Influences weather systems in the
________________________ by following
the same path, bringing various types of
weather
 Migrate slightly south in the winter months,
bringing polar air and winter storms with it
Chinook Winds
 Warm winds that blow down the
____________________ of a
mountain
 The winking air is warmed by
compression at about 1 degree
Celsius per 100m that it drops
 After this wind passes,
temperatures can again go back
down to below
_____________________________
Land and Sea Breezes
 Land warms and cools much faster than water creating temperature
and pressure changes between these two locations
 In the summer, land heats quickly after sunrise and the air in contact
with the warming ground also warms and expands
 As this warm, expanded air begins to rise, cool, dense are from the
ocean flows in to replace it called a __________________
(originates over the ocean and travels to land)
 Air over a warmer ocean begins to rise and the cooler air from land
moves out to replace it resulting in a _______________________
Valley and Mountain Breezes
 On hot days, valleys act as wind tunnels, making extremely high winds
in mountain passes
 As the Sun heats the mountain slopes,
________________________________________________________
________________________________________________________
 The narrower the valley, the stronger the wind
 Why?
 At night, mountain slopes cool rapidly and the dense air begins to sink
into the valley
Lesson Vocabulary
Westerly Winds
Easterly Winds
Coriolis Effect
Jet Stream
Land Breeze
Valley and
Mountain Breezes
Trade Winds
Chinook Winds
Doldrums
Sea Breeze