Caption: +Zonally averaged meridional cross section (1000 hPa to 10 hPa) taken from 30N to 90N. +Zonal average air temperature (solid black contours every 5 deg C). +Zonal average u-comp of the wind (shaded according to the colorbar and thin white contours every 5 m/s). Warm colors are westerly flow (out of the page) while cool colors are easterly flow (into the page). +Image was generated from 0.5x0.5o NCEP-GFS data.