1. Air Pressure?

2. Air pressure The force of the overlying air molecules Altitude affects air pressure Humidity affects air pressure – dry or humid? Which molecules are lighter Temperature affects air pressure measured in inches of Mercury or milibars

3. Warm up What’s the barometric pressure?

4. Isobar Line of equal pressures Look like contour lines (topographic maps) Drawn on multiples of 4 milibars

5. Warm up Why is the weather cold and dry? Do toilets flush differently in the Southern Hemisphere? Why or why not?

6. wind Named by the direction that the wind comes from Westerly wind comes from the west Always go from high to low pressure – air rushes out of a balloon

10. Local Breezes Land – heats up faster, cools faster Water Named by where they are coming from Example Sea Breeze comes off the water

12. Compare and contrast sea breeze vs land breeze Horse latitudes vs doldrums Monsoons ITCZ – why does it shift with the seasons. Prevailing wind direction in United States

13. Test format Multiple choice – 10 Interpret a map – label pressures at specific points, show the general wind direction Draw the isobars. Label relative pressures. Draw wind direction (as practiced today.) Label prevailing winds. Show general pressures. Choose 4

14. Try this! http://daphne.palomar.edu/jthorngren/wind s.htmhttp://daphne.palomar.edu/jthorngren/wind s.htm It’s a wind quiz!!