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