Polar vortex status

The SPV is currently marginally weaker than ERA5 average and is forecasted to become stronger than average (according to GEFS-mean) 28 of 31 members have stronger vortex than average at the last forecast step (2025-07-21 12:00:00) . The zonal mean zonal wind at 10 hPa 60N is today (GFS analysis): -12.0 m/s Weakest zonal wind at 10 hPa 60N in ERA5 record for todays date is: -13.8 m/s 2020 Strongest zonal wind at 10 hPa 60N in ERA5 record for todays date is: -9.9 m/s 1981