CFSv2: 10 hPa 60°N [U]

Ensemble plume

Bias correction is applied to forecasts launched between 1 November and 31 March inclusive. The bias is calculated as the difference between the 1999-2010 hindcasts (as stored on the S2S database) and ERA-Interim reanalysis. The CFSv2 has a significant bias toward a weak vortex (shown here as a function of launch date), especially for forecasts launched in early winter, so accounting for this drift is necessary.

CFSv2 ensemble