STATUS ORANGESnow-ice Warning for Cavan, Monaghan and DonegalAn Atlantic depression will cross Ireland this evening and early tonight bringing a spell of snow on its northern flank. This will be followed by scattered snow showers later in the night and Thursday. At present, the main risk of appreciable accumulations is limited to Ulster.Issued:Wednesday 17 January 2018 10:00Valid:Wednesday 17 January 2018 18:00 to Thursday 18 January 2018 12:00