Someone tell me that I've simply not be paying attention but there are Stratosphere 10hPa charts on Meteociel.
The 12z run shows two major warmings but one starts in NE Russia and moves slowly east before fading. The second starts over North Africa and moves east to Siberia. The one constant is that the stratosphere at that height remains cold over our part of the world throughout.
http://176.31.229.228/modeles/gfs/run/gfsnh-10-72.png?12
http://176.31.229.228/modeles/gfs/run/gfsnh-10-120.png?12
http://176.31.229.228/modeles/gfs/run/gfsnh-10-144.png?12
Then:
http://176.31.229.228/modeles/gfs/run/gfsnh-10-240.png?12
http://176.31.229.228/modeles/gfs/run/gfsnh-10-300.png?12
http://176.31.229.228/modeles/gfs/run/gfsnh-10-360.png?12
Something else to watch.
Location: South Cambridgeshire
130 metres ASL
52.0N 0.1E