All layers of the stratosphere are being impacted by an incredibly large and immense sudden stratospheric warming at this time. The above animation shows 10 millibar temperatures from mid December to january 11th. You can see the current warming event originating from the Himalayas and has now propagated to the Arctic. The thing that makes this warming so incredible is just how much land it is covering, and just how intense this warming really is. According to observed temperatures like the one shown below, this event was indeed historic, breaking the daily stratosphere record temperature for a few days:
Unusually intense warming is also going on in the lower, more significant layers of the stratosphere, including the 30mb and 50mb layers respectively shown below:
If history of sudden stratospheric warmings are any testament to what could happen from these warmings, Siberia could be right in predicting a very cold February for much of the nation from above normal snow cover in the last half of the month of October 2012.