Snow showers affecting high ground are expected to start to fall to low levels through Thursday evening and overnight. Due to the showery nature accumulations of snow will vary, but on low ground 1-2 cm is possible in places by Friday morning, while on hills above 300 metres accumulations of 2 to 5, perhaps very locally 10 cm are possible. In addition to the snow temperatures will fall quickly, and this is likely to lead to ice on untreated surfaces. For further details see https://www.metoffice.gov.uk/weather/warnings-and-advice/uk-warnings