####------------------------------------ Polar vortex status ------------------------------------###

The strat. vortex is currently stronger than ERA interim average 
and is forecasted to remain stronger than average (according to GEFS-mean)
31 of 31 members have stronger vortex than average at the 
last forecast step (2021-12-21 00:00:00)

The zonal mean zonal wind at 10 hPa 60N is today (GFS analysis): 33.0 m/s 
Weakest zonal wind at 10 hPa 60N in ERA interim record for todays date is: 1.2 m/s 1981 
Strongest zonal wind at 10 hPa 60N in ERA interim record for todays date is: 55.3 m/s 2015