We call these storms right movers . Likewise, if a storm moves slightly to the left of its path, it's termed a left movers . Most of the time, the vertical change in wind direction and speed will be such that left movers will not be quite as strong as their right moving counterparts. This phenomenon occasionally occurs in the vicinity of hail-producing thunderstorms. First, some background information.
White light is composed of many colors as evidenced by a rainbow.
This type of idea can be extended to explain this phenomenon. As light enters a hailstone, the colors are separated in such a way that the color green becomes dominant. A supercell is one of the main types of thunderstorms meteorologists like to talk about. Supercells, in many cases, are also rather long lasting. When the updraft of a thunderstorm encounters one of these areas, rotation is induced in the thunderstorm's updraft.