A ‘blocked weather pattern’ could bring will develop within weeks, increasing the chances of wintry weather across the UK. London weather: Temperature plunges below zero as Met Office issues UK snow alert - A ‘blocked weather pattern’ could bring will develop within weeks, increasing the chances of wintry weather across. Conditions are predicted to remain bitterly cold on November 13, with the North Pennines once again among the chilliest spots at -1C.