4) The geostrophic wind at 850 hPa is 7 m/s out of the north and the geostrophic wind at 500 hPa is out of the SW (225 degrees) at 25 m/s. i) Draw a diagram that indicates the magnitude and direction of the thermal wind; next add some isotherms showing location of the warm and cold air masses relative to the thermal wind. You may assume that Tv~T. ii) Calculate the temperature gradient in the x and y directions. Check to see that you have a consistent answer iii) advection. Use the mean wind vector in the layer and calculate the temperature