The Met Office has shown it can predict the weather one year in advance with its new £97 million supercomputer.

Scientists believe they can now forecast with some accuracy the North Atlantic Oscillation (NAO) weather phenomenon in the Atlantic Ocean which largely governs the British winter.

The phenomenon forms because of low-pressure over Iceland and high pressure over the Azores in the Atlantic.

A large pressure difference brings increased westerly winds, cool summers and mild, rainy winters. In contrast when the difference is small there are fewer winds and Britain shivers in a big freeze during the winter months.