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Wind shear is a change in wind speed and/or direction over a short distance. It can occur either horizontally or vertically and is most often associated with strong temperature inversions or density gradients. Wind shear can occur at high or low altitude. Not all fronts have associated wind shear. In fact, shear is normally a problem only in those fronts with steep wind gradients. As with so many things associated with weather, there is no absolute rule, but a couple of clues tell you that wind shear may occur: • The temperature difference across the front at the surface is 10 o F (5 o C) or more. • The front is moving at a speed of at least 30 knots. You can get clues about the presence of wind shear during the weather briefing by checking these two factors. Ask the briefer and, if these factors are present, be prepared for the possibility of shear on approach. Wind shear is just one of the many unpleasant aspect of thunderstorms. The violence of these storms and their winds are well documented. The two wors