Polar vortex status

The SPV is currently weaker than ERA5 average and is forecasted to remain weaker than average (according to GEFS-mean) 8 of 31 members have stronger vortex than average at the last forecast step (2025-05-14 18:00:00) . The zonal mean zonal wind at 10 hPa 60N is today (GFS analysis): -5.4 m/s Weakest zonal wind at 10 hPa 60N in ERA5 record for todays date is: -20.6 m/s 2011 Strongest zonal wind at 10 hPa 60N in ERA5 record for todays date is: 8.6 m/s 2009