The Met Office has issued a second weather warning of ice for Derry.
The yellow status warning was issued on Friday morning and is valid from 5pm on Friday through to 10am on Saturday.
"Some icy patches are likely to form on untreated roads, pavements and cycle paths on Friday evening and overnight into Saturday," said the Met Office on their official website.
"There is potential for slippery surfaces and difficult driving conditions. Snow showers are also expected, mainly over high ground, with longer journey times possible."
The Met Office's Chief Forecaster said that it was possible that snow could fall on lower ground too.
"Small amounts of snow are possible at low levels inland, mostly in the north."
Met Éireann, the national meteorological service in Ireland, has also issued a snow-ice weather warning for all of Ulster.
Met Éireann's weather warning is valid from 5pm on Friday through to 12pm on Saturday.