The stratospheric #PolarVortex is in beast mode & likely to remain so for some time. It's currently date-record (since 1979) strong for the time of year (according to ERA-Interim), and the GFS projects it to pretty much maintain record strength for the entire forecast period. pic.twitter.com/2ImL3hjNEy

— Simon Lee (@SimonLeeWx) February 17, 2020