BLOWIN' IN THE WIND

1. BLOWIN' IN THE WIND

2. temperature differences cause pressure differences which cause the movement of air, wind • USA wind maphttp://hint.fm/wind/ • Earth wind map http://earth.nullschool.net/#current/wind/isobaric/10hPa/orthographic=-74.14,2.58,303

3. 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

4. winds are named for the direction in which they come from

5. there are 3 categories of winds: • local/regional, global, & episodic (storms)

6. there are 4 types of local/regional winds: land/sea breeze, monsoon, mountain/valley wind, & foehn

7. 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

8. 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

9. 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

10. 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 foehnin the Rocky Mountains

11. 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