Q vectors and their convergence

[fherreazcue]

Create a set of plots for the Q vectors and their convergence at 700, 500, and 300 hPa (red/blue color shading), overlaid with the geopotential height (30, 60, and 120-m contour intervals, respectively). We may need to do a synoptic-scale filter on the winds and the geopotential heights first. I can provide more details.