Watch how forecasts from CFSv2 for January 2019 have shifted from a +NAO to a -NAO in the last week. This is likely in response to the growing signal for stratospheric #PolarVortex disruption... and why the stratosphere is very important for your day-to-day life this winter! pic.twitter.com/1Rb8M3CUfn

— Dr Simon Lee (@SimonLeeWx) December 22, 2018