Tonto 55, to low for safe approach. Uh, GCA, Tonto 55, on the go. Everyone would shake their heads and go on as usual. Now, thanks to increased research and experience, we are more aware of complex problem of wlnd shear. 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.
This article will discuss only low altitude wind shear. Not all fronts have associated wind shear. In fact, shear is normally a problem only in those fronts with steep wind gradients. You can get clues to the presence of wind shear during the weather briefing by checking these two factors. Ask the briefer, and if they are present, be prepared for the possibility of shear on approach.