'Thundersnow' wakes up people with loud explosion-like noise in Edinburgh
Residents of Scotland's capital Edinburgh contacted emergency services when they were woken in the early hours of Friday by noises similar to loud explosions, that also set off their car alarms. Police explained that it was caused by the phenomenon known as 'thundersnow'. It happens when thunderstorms form in wintry conditions, giving rise to heavy downpours of snow, they added.