A band of heavy rain will spread eastwards during Tuesday morning, quickly turning to snow on high level routes above 300 metres and to lower levels for a time before it clears.
Accumulations of 5-10 cm of snow are likely above 300 metres, much of this falling in a short period.
At lower levels, amounts will be much more variable with a few cm possible in some places while others will just see sleet and rain.
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After a frosty start, a cold and bright day follows.
Cloud will thicken from the northwest during the afternoon, perhaps with some rain and hill snow in the west later.
Maximum temperature 3 °C.
Following a spell of rain, sleet and hill snow, temperatures will fall quickly allowing ice to form on untreated pavements, cycle paths and roads.
Heavy snow showers will follow.
Some injuries from slips and accidents on icy surfaces are possible.
Some roads and railways are likely to be affected with longer journey times by road, bus and train services.