The link is to a "model tracker" which is a moving pictures/sound (multimedia) description of what might happen at the end of the week.
As usual people need to keep an eye on what the numerical models and other forecasts say as we get closer. People such as the BBC would never talk about such forecasts as they are so far in advance that they cannot be relied upon.
It is, however, a useful introduction to numerical forecasting if anyone is interested in that.
At the moment (and this is almost a week out) a lot of snow is being forecast for the UK.