Straight line winds can occur locally with most severe thunderstorms, but in particular systems of storms along a line known as the squall line and supercells. Basically, straight line winds are defined as winds that do not clearly show signs of convergence or divergence locally. Damage usually consist of felled trees, unroofed houses, downed power lines and poles, and overturned vehicles. From the effects of the damage, the direction of the straight line winds can approximately be determined. Trees and poles will mostly be felled in the direction of the wind. Debri including branches of trees will also be blown in the direction of the wind. Cars or other vehicles as well as buildings can be damages by falling trees.
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