Small fix to plotting_utils.py.  Previously, was passing only  objects around between methods.  Should have been passing  objects around as well, so that the methods know which axes to plot things on.
Small fix to plotting_utils.py.  Previously, was passing only  objects around between methods.  Should have been passing  objects around as well, so that the methods know which axes to plot things on.

thunderhoser/GewitterGefahr