Conceptual model (from Han et al.)
Notes:
Another conceptual model regarding the dynamical forcing associated with heavy snow banding is summarized by the figure shown above. A trough of warm air aloft (TROWAL) is indicated by the grey shading. Heavy snow bands typically occur within the TROWAL, northwest of the surface through mid-level cyclone. The conceptual model shown on this slide indicates that areas of frontogenesis naturally form in association with a TROWAL, and that these areas of frontogenesis help to focus the heavy snow bands.
Slide 13