This stratospheric vortex has really had a hard life. First it can't manage to propogate downwards. Then it gets nibbled and then munched by wave 2 activity. Then a warm plume develops over the Pacific which may or may not work its way towards the Canadian sector. Then we have a large increase in westerly winds over 30-40N which might further enhance tropaves and wave 1 and wave 2 actvity in the next 2-3 weeks.
Then, up pops GFS12z which increases temps at the very edge of the stratosphere by 20C in the space of a day or two over Asia at the extende range. Over the top ?
http://forum.netweather.tv/topic/74587-stratosphere-temperature-watch-20122013/page__st__760#entry2408304
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