A rare UFO-like 'fog dome' (pictured here) was spotted by a dog walker in North Wales yesterday morning at 8am
A rare UFO-like 'fog dome' (pictured here) was spotted by a dog walker in North Wales yesterday morning at 8am
Temperatures are expected to drop below freezing this weekend, prompting health officials to warn that the chilly conditions can be deadly.

Cold weather alerts have been issued for much of the country as forecasters expect 'severe cold weather' to set in today.

A rare UFO-like 'fog dome' was spotted by a dog walker in North Wales yesterday morning at 8am.

Hannah Blandford was with her pet in the village of Tremeirchion when she came across the spectacle which has been dubbed an 'alien pod'.

The 33-year-old who works as a teacher told The Sun: 'I couldn't believe how perfectly dome shaped it was, it looked amazing, so I had to take a photo. I'd never seen anything like it before, it was really quite special.

'I watched it for about 10 minutes and then the dome started to flatten and it looked like very thick low lying cloud. It spread out across 12 fields and covered a huge area.'

Forecasters think the fog dome was caused by heat rising up from the ground.

Forecasters think the fog dome was caused by heat rising up from the ground. Hannah Blandford, 33, was with her pet in the village of Tremeirchion when she came across the spectacle
Forecasters think the fog dome was caused by heat rising up from the ground. Hannah Blandford, 33, was with her pet in the village of Tremeirchion when she came across the spectacle

Public Health England (PHE) has issued level two alerts for all regions - apart from the South West, South East and London - and have urged people to look out for their family, friends and neighbours.

'A lot of places will see temperatures hovering around freezing or just below but if we have got clear skies we may get to minus four or below,' Nicky Maxey, a Met Office spokeswoman said.

'The temperatures were cold and then they got a little bit milder and now they are getting colder but they are not getting as cold as they have been.

'So, although we are going to see temperatures dip a little bit over the weekend, we are certainly not going to see them go down as cold as they have been.'