WAA is Warm Air Advection. Warm air riding into colder air.
DGZ is Dendritic Growth Zone. If you look at the left side of the image above you will see two dashed red lines and yellow horizontal bars. The bar represent rising air and you want to see the best rising air concentrated within the zone of the clouds where snow crystals form. The longer and deeper you can sustain that, the better the snow accumulations will be.