Chapter 17 continued

 The horizontal movement of air from high pressure to low pressure  Moderates surface temperatures  Distributes moisture  Cleanses the atmosphere

 Wind vane – weather vane (direction)  Anemometer (speed)

 Pressure gradient  Coriolis Effect  Friction

 Lower level winds are affected by the surface they flow over  ocean vs. mountains

 Upper winds little to NO friction  kph  West to East  Location changes with the seasons

 What is it  Does it change with the seasons  Why do we care? hIh_Bw

But Earth DOES rotate

 Fairly accurate - for surface winds and pressures near the equator and poles  Not so accurate – for mid-latitudes (30 o -60 o ) where short lived pressure systems occur

 Monsoon Recall the seasonal shift of the jet stream