An interesting TAF

Wind shear as expected wouldn't be for the faint of heart. Presure gradients as shown gives additional clues as to what find of flight one might expect.

John,

This is called non-convective low level wind shear and is harmless most of the time.  It's a form of vertical speed shear and isn't associated with convection and is not a forecast for turbulence.  It's probably the most misunderstood weather forecast in aviation - most of the instructors that I've spoken with over the years don't understand it either.  

John,

The turbulence you experienced wasn't due to this non-convective LLWS.  In most cases the air is glassy smooth.  It is often present on clear, calm nights and you may not know it is even there unless you take notice of your ground speeds as you land.  It's not typically forecast in this situation, but I've seen it dozens of times at night.  My point is that non-convective LLWS as it appears in a TAF is NOT a forecast for turbulence.  And, it is not the same wind shear as you might experience with convective activity.  But unfortunately, pilots just don't understand that.    

As I said, it is probably the most misunderstood forecast in aviation.  Sort of like when pilots don't want to run their airplane LOP because they believe it'll hurt the engine.  In fact, I've written a couple of articles about non-convective LLWS and developed a couple of workshops so pilots can really understand what it is and not to be afraid of it.    

In general I've had quite the opposite experience with this forecast.  Most of the time the air is glassy smooth.  So I am quite happy to see it.   Ever fly at night when the air is clear and winds at the surface are calm?  I can almost guarantee you that you will fly through non-convective LLWS when you land or depart and don't even know it.  That's all courtesy of a nocturnal temperature inversion.