There is an increasing signal from GEFS of the Alaskan Ridge regime developing over North America during mid-February. This is the regime most strongly associated with severe cold air outbreaks in the central region of the continent [https://t.co/a5YMSsGsDe]. One to watch! pic.twitter.com/I6lGfgMAdB

— Dr Simon Lee (@SimonLeeWx) January 28, 2021