Monday will bring a spell of heavy rain which is likely to turn to snow as the low pressure system moves across the southern half of the UK and collides with colder air moving down from the north.
A yellow Met Office severe weather warning is valid from Monday evening until Tuesday morning, covering southern Scotland, northern England, north Wales, Northern Ireland and the north Midlands.
Up to 20cm (8in) of snow is possible on the high ground of the south Pennines but even at lower levels we could expect to see perhaps 2-10cm (1-4in) of settling snow. There will also be icy stretches.
Travel disruption is possible, particularly on the higher trans-Pennine routes during Tuesday morning.
Wintry showers brought snow to northern Scotland on Sunday and are continuing into the first half of the week, with snow accumulating, mainly over high ground.
Up to 10cm (4in) of snow could settle on higher ground with 1-3cm possible at lower levels in northern Scotland.