Polar vortex status

The SPV is currently weaker than ERA5 average and is forecasted to remain weaker than average (according to GEFS-mean) 2 of 31 members have stronger vortex than average at the last forecast step (2026-04-17T12:00:00) The SSW probability in GEFS is: 100%. The zonal mean zonal wind at 10 hPa 60N is today (GFS analysis): 3.4 m/s Weakest zonal wind at 10 hPa 60N in ERA5 record for todays date is: -22.1 m/s 2025 Strongest zonal wind at 10 hPa 60N in ERA5 record for todays date is: 33.6 m/s 1997