[QUOTE=sheeny;1569018]The GDR acts like the top surface of an aeroplane wing or the bottom surface of a venturi - in general the wind speed over the mountains is higher than either side of it. But when there's no wind... seeing can be excellent, provided the jet stream also plays well. QUOTE
Agreed Al, much the same case here at Windeyer. Easterlies are great for a short time, but the upper turbulence can be very noticeable for short periods.
Also, the NOAA site is a wealth of information for all of us; not only including this topic. Just used it's calculator to determine today's solar noon so I can layout a Southern shadow. Definitely it's worth a look for other handy networks and data.
