I'll tell you the technique I used to use most of the time when I lived in Lawrence. As soon as I heard that snow was on the way I would visualize a cone of heat with its narrow end tacked down on Topeka -- a cone sort of like Superman's vision cones. It was red on the edges and that hot yellow toward the center. Snow would miss Lawrence every time. Use intensity when visualizing. As a description of one way, that's the best I can do.

:)