The strat. vortex is currently weaker than all other years in the ERA interim record!!!
The zonal mean zonal wind at 10 hPa 60N is today (GFS analysis): -15.5 m/s
Weakest zonal wind at 10 hPa 60N in ERA interim record for todays date is: -13.0 m/s 1987
Strongest zonal wind at 10 hPa 60N in ERA interim record for todays date is: 70.8 m/s 1988

u10serie.png

north_pole_Zanomaly.png

e propagazione in bassa stratosfera

Immagine.png