When 100 hPa is forecast to look like a face, fun things might happen!

There has been some increasing suggestions from GFS of a switch to a stratospheric wave-2 disturbance in late Jan/early Feb, in contrast to wave-1 which has dominated so far. pic.twitter.com/dzoBOpl3Jt

— Dr Simon Lee (@SimonLeeWx) January 16, 2021