BLOWIN' IN THE WIND
temperature
differences cause
pressure differences which cause the
movement of air, wind
USA wind map http://hint.fm/wind/
Earth wind map
http://earth.nullschool.net/#current/wind/isobaric/10hPa/ortho
graphic=-74.14,2.58,303
a
wind’s job is to distribute the
unequal heating of the earth
warm air creates lower pressure
cool air creates higher pressure
air moves from higher pressure to
lower pressure
winds
are named for the direction in
which they come from
there
are 3 categories of winds:
local/regional, global, & episodic
(storms)
there
are 4 types of local/regional winds:
land/sea breeze, monsoon,
mountain/valley wind, & foehn
LAND/SEA BREEZES
diurnal wind change on the coast
land breeze: at night the land cools down faster,
creating a higher pressure and cool winds coming
from the land
sea breeze: in the day the water heats up slower,
creating a higher pressure and cool winds coming
from the water
MONSOONS
seasonal change in wind, Arabic word meaning
season
in the winter the land cools
down faster, creating a higher
pressure and dry winds
coming from the land
in the summer the
water heats up slower,
creating a higher
pressure and wet
winds coming from
the water
MOUNTAIN/VALLEY WINDS
diurnal wind change in
the mountains due to
density differences
mountain wind: at night
the cooler, more dense
air of the mountain falls
into the valley
valley wind: during the
day the air in the valley
warms up (low pressure)
and rises into the
mountains
FOEHN
extremely warm and dry air that comes down the
leeward side of a mountain
can evaporate 2 feet of snow and raise the
temperature 50 °F in 12 hours
chinook “snow eater”, is the local name for a foehn in
the Rocky Mountains
HW:
Read
pages 366-373
Answer # 1-3 on page 373
Read page 376
Answer # 5 on page 377
Answer # 21-25 page 387
Read 427-429
Answer # 3, 4 page 429
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