1. “Air Pressure, Centers, & Wind” 19.1/19.2

2. Air Pressure Weight of Air All directions Changes in pressure cause wind Wind changes temperature & humidity

3. Barometer Bar = pressure Metron = measuring tool

4. 1.Pressure “Gradient” (differences) 2.Coriolis Effect 3.Friction Factors Affecting Wind

5. 1.Pressure “Gradient” Gradient = difference Uneven heating from sun Air moves from H p  L p HpHp LpLp

6. Air Pressure –Measured in “Millibars” Isobar –Line of same pressure! Close Isobars –Fast wind Far Isobars –Slow wind 1008

7. Predicting the Weather

8. Weather Map 1.Pressure Center –Bull's-eye (High/Low) 2.HP –Clear skies –Good weather 3.LP –Cloudy –Precipitation 

9. High Pressure System. Nice Weather.

10. Low Pressure System.  NOT Nice 

11. 2.Coriolis Effect –Changes wind direction –B_____ –Earth’s R________ 3.Friction –Changes direction –Kite ENDS OTATION