The Met Office have extended their weather warning until the end of Tuesday 11 February.
They also say the amounts of snow expected have increased.
They commented: "Snow showers will mainly be over high ground, giving slight accumulations of 1 to 3 cm above 150 metres and 5-10 cm above 300 metres.
"Snow will gradually build up and, in a few locations, accumulations of over 20 cm are possible by Tuesday evening over the highest routes.
"Strong winds, gusting 50-60 mph, will lead to blizzard conditions at times and considerable drifting of lying snow.
"Frequent lightning strikes are also possible, perhaps leading to interruptions to power supplies."