http://cliffmass.blogspot.co.uk/2010/02/why-was-my-flight-so-bumpy.html)
Patches of lift interspersed by areas of severe sink suggested wave activity. Cloud base c1800 - tops 2500ish. Inset shows wind shear at Larkhill at about the same time. Apparently this is Kelvin-Helmholtz instability, rotary motion of air close to cloud tops caused by the interaction between different atmospheric streamlines (like wind causes waves on the sea). Interesting, but totally useless - longest flight 17 mins.
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