The UK snow charts are updated every 6 hours and are available in 3 hour steps. These are generated using the high resolution GFS deterministic forecasting model.
The UK ensemble postage stamp charts are updated every 6 hours and are available in 6 hour steps. They are generated using the high resolution GEFS forecasting model.
Each image shows the output from one of the 22 GEFS runs, including the control and mean.