850 hPa streamfunction (thin black contours every 2x106 m2 s-1, negative dashed, positive solid), temperature (solid contours every 2oC, positive red, negative purple), nondivergent wind (standard barbs in knots), and temperature advection (shaded in K day-1). Temperature and temperature advection are smoothed using a 9-point local smoother run 5 times.
These plots are derived from the NCEP GFS analyses and forecasts on a 0.25x0.25o latitude-longitude grid.