03:00 on Wednesday until 18:00 on Wednesday
Following a spell of rain, temperatures will fall quickly allowing ice to form on untreated surfaces.

Frequent blustery showers of rain, sleet, snow and hail will then also develop. Some roads and railways are likely to be affected by snow with longer journey times by road, bus and train services.
Some injuries from slips and falls on icy surfaces are also possible.

Chief Forecaster's assessment
2-5 cm of snow is expected to accumulate in places above 200 m. Some snow is also possible to low levels at times, mainly overnight. Snow is expected to become confined to higher routes, mainly above 250 m on Wednesday afternoon.