The alert, issued by the UK Health Security Agency (UKHSA), is in effect from 9 AM on Sunday through 9 AM on Thursday, warning of potential health risks associated with the cold.

The Met Office has also released two yellow warnings for snow and ice. The first warning affects northern Scotland from 4 PM on Sunday until 11 AM on Monday, with forecasts predicting up to 10 cm (4 inches) of snow on higher ground.

A second yellow warning will be in place from 7 PM on Monday until 10 AM on Tuesday, covering parts of northern England and southern Scotland, where up to 20 cm (8 inches) of snow could accumulate in higher areas.

Forecasters anticipate chilly conditions, with temperatures in northern Scotland hovering around 4-5°C (39-41°F) on Sunday, while the far south of England may see slightly milder temperatures of 11-12°C (52-53°F).

By Monday morning, temperatures are expected to drop to around zero or even below, particularly in rural areas, leading to potential frost and icy patches.

The warnings suggest possible disruptions to travel, including delays for bus and train services and hazards for drivers.

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The UKHSA’s alert aims to prepare healthcare services for increased demand, particularly for those who are vulnerable.

Overall, the UK is bracing for a cold snap that could impact daily life and health services in the coming days.