Joanna Donnelly predicts that cold weather will prevail.
Met Éireann's raised it's advice about of snow and cold weather with the issuing of an official weather warning remains in place for the coming days as the cold snap continues to bite.
The forecaster says the spell of chilly weather will run well into the week.
It issued has issued a Status Yellow warning for Monday night to Tuesday morning.
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A widespread frost on Sunday night was expected to be followed by a dry over eastern counties on Monday morning but rain will gradually spread to all areas during the afternoon and evening.
The rain will be heavy for a time and may be preceded by sleet over northern hills and accompanied by fresh blustery southwest winds. Clearer colder conditions with rain or hail showers will follow later as winds veer northwest.
Highest temperatures will range from 3 degrees in the north to 8 degrees near southwest coasts.
Remaining rain in eastern counties will clear early on Monday night but scattered showers will continue to feed in across the country from the Atlantic. Met Éireann expects some of the showers to be heavy and possibly thundery, and they will turn increasingly wintry overnight, falling as a mixture of rain, hail, sleet and snow, producing a heightened risk of icy stretches on untreated surfaces.
Minimum temperatures minus 2 to plus 2 degrees Celsius in mainly moderate westerly winds, which will be fresh to strong and gusty near coasts. Frost forming in sheltered spots.
Tuesday will be a very cold day with sunny spells and widespread showers. The showers will continue to be wintry, falling as a mixture of rain, hail, sleet and snow.
Afternoon highs of just 2 to 5 degrees generally, but 6 to 7 degrees in the coastal fringes of the west and south. Moderate northwesterly winds will be fresh to strong and gusty near coasts.
There is still the risk of further wintry falls, mostly for inland Ulster. Lows of minus 2 to plus 2 degrees with a widespread frost and the risk of icy patches in light to moderate northwesterly breezes.
Many central, eastern and southeastern areas will be dry and bright with sunny spells and just the odd shower on Wednesday. It will be cloudier further west and north with patchy rain and drizzle. Still rather cold with afternoon highs of 3 to 7 degrees in light northwest breezes which will be moderate along east and south coasts. Many areas will be dry with long clear intervals on Wednesday night, although cloud will tend to linger near west and southwest coasts with the risk of patchy drizzle continuing there. Cold, with lows of minus 3 to plus 3 degrees in near calm conditions with another widespread frost and the risk of icy patches.
There is still some uncertainty with regard to Thursday's forecast, but current indications suggest a cold day with frost only slowly clearing on Thursday morning and afternoon highs in the low single figures with light southerly breezes. There is a chance that an Atlantic weather front will advance sooner and thus produce a cloudy but less cold day with patchy rain and drizzle. However, at present, this scenario is more likely for Friday.
Friday is expected to be mostly cloudy with patchy rain and drizzle edging in from the Atlantic accompanied by moderate southwesterly breezes. Milder than recent days with highs of 8 to 10 degrees in light to moderate westerly winds.
Current indications suggest our weather becoming colder again later Saturday and Sunday with a northwest airlow over the country.