To produce weather forecasts for two to 30 days ahead, we use a variety of techniques:
Our North Atlantic and European numerical forecast model provides more detailed information over this region in forecasts out to two days ahead.
When forecasting more than two days ahead we need to use our global forecast model.
More than two days ahead we need to use our global forecast model, because the weather happening thousands of miles away today will affect our weather.
The model is a computer simulation of the processes in the Earth's atmosphere, land surface and oceans which affect the weather.
For those working at sea or living near the coast, forecasts of wave height, ocean currents or storm surges are just as vital as forecasts of the weather.