Britons have been warned to expect the coldest temperatures of the year so far across much of the country over the coming days.
Yellow weather warnings for snow have been issued across parts of England, Scotland and Northern Ireland as Arctic air moves through the country.
As much as 10cm of snow is expected to fall in Scotland, with 5cm in other areas.
The warnings, in place from 9pm on Monday through to 10am on Tuesday morning, are expected to move down to northern England.
The UK Health Security Agency (UKHSA) issued a cold weather alert and has placed north-east England, north-west England and Yorkshire under a level three alert, with the rest of England placed at level two.
Temperatures could fall to as low as -10°C in northern Scotland and as low as -4°C in parts of Greater Manchester, with the forecast unlikely to get far above freezing until later in the week.
The Met Office said 1-2cm centimetres of snow could settle in some places, with widespread frost and icy patches expected as temperatures fall below freezing.
Met Office forecaster Honor Criswick said: “We are expecting a few more snow shower outbreaks into this evening and seeing a bit more snowfall early on, which is why the warning was brought forward. We are expecting pretty cold conditions and snow showers over the next few days across Scotland and northern parts of England.
“Temperature-wise, we could possibly see lows of minus 10°C in the sheltered glens and higher ground across northern Scotland on Monday night, so it’s going to be feeling quite cold and the breeze is picking up a little bit so will be feeling rather chilly.
“Potentially, we could see some of the coldest temperatures so far this year. The lowest we have seen was in January at minus 10.4°C, so we could see something turn lower than that.”