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

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

Barometer Bar = pressure Metron = measuring tool

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

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

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

Predicting the Weather

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

High Pressure System. Nice Weather.

Low Pressure System.  NOT Nice 

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