On Sep 5, 12:56*pm, Weatherlawyer wrote:

Ice in fuel caused Heathrow 777 crash

*During its investigation, the AAIB noted that during flight BA038
"there was a region of particularly cold air, with ambient
temperatures as low as -76°C, in the area between the Urals and
Eastern Scandinavia".http://www.theregister.co.uk/2008/09...w_777_verdict/

Here is a pretty good example of the thermocline:
http://www.woksat.info/etcqg09/qg09-1326-b-xx.html