The animation shown above details the last 30 days of temperature anomalies at the 10 millibar level of the world, known as the upper stratosphere. The last month of temperature observations has revealed two bodies of above-normal temperature anomalies. The first body of warmth made an initial push to the Arctic in the Bering Sea, but after the attempt was foiled, the warmth appears to have shifted into Siberia and may be making a second attempt. The second swath of warmth also shifted east from the northern Atlantic into much of Canada. This area of warmth has been more oppressed as far as being able to push north, and it seems to be weakening in the last couple frames of the animation. Nonetheless, the uneasiness in the northern hemisphere tells me that the atmosphere is determined to shift into its summer stages, where bodies of warmth like the ones shown above are not present. Time will tell when this happens, but until it does, I suppose you can't blame the atmosphere for staying in a wintry pattern over the last several weeks.