Meteorologists warn that the heavy rainfall, posing life-threatening flash flooding risks, will persist through Tuesday.

A staggering 500,000 residents in California are currently without power, with forecasters issuing warnings of what they describe as “one of the most dramatic weather days in recent memory.”

Storm Ingunn, named by the Norwegian Meteorological Institute, was classified as a ‘weather bomb’ as its pressure dropped at double the required rate, bringing winds of more than 100mph to the UK.

‘Although turning windy it will be mild, especially in any brighter breaks.’

Flights have already been grounded and some train services suspended as Storm Jocelyn continues to sweep across the nation

Boys aged 4 and 6 who stayed home from school due to frigid temperatures in Missouri were killed in a house fire.