 like them, therefore they must be wrong" I know that attitude bugs skeptics, so why do they also do it?  One need only look at the actual data. The issue is not southernly jet streams. The issue, as even Judith Curry has remarked, is that when the arctic warms you see a change in the N-S gradiant. This leads to a slower jet stream and hence a jet stream with larger amplitudes. That's measureable. So, it's not "warmists" it's the facts. Sorry.  But recently Northern Polar Lower Troposphere Temperatures have been the coolest they've been in several years, and right around average: