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/orthographic=-74.14,2.58,303

a wind’s job is to distribute the unequal heating of the earth

warm air creates lower pressurecool air creates higher pressureair 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 366-373Answer # 1-3 on page 373Read page 376Answer # 5 on page 377Answer # 21-25 page 387Read 427-429Answer # 3, 4 page 429