"Tonight there will also be some accumulations of snow on lower levels over central and southern parts of Leinster and over east Munster", they added.
A pivoting system of wintry weather resulted in much of southern England and Wales waking up to more snow and ice after the coldest night in the United Kingdom since 2012.
The wintry showers should steadily ease off as the day goes on and brighter spells are expected in northern and western areas.
Road users and air passengers have already been delayed by the weather and there are warnings of rail delays and cancellations, power outages and the cutting off of rural communities.
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It's set to be the best title race we have seen since 2013-14, which was coincidentally contested by the same 2 clubs. We always have to improve and not concede goals early because it is so hard to get back and change the game.
Cornwall Airport closed due to snow on Thursday, with Bristol Airport closing on Friday.
Authorities asked motorists to completely clear their vehicles of snow and Wiltshire and Thames Valley police forces advised drivers to travel only if absolutely necessary.
Met Office meteorologist Emma Smith said: "There is still sleet and snow across southern counties, the band is now sitting across the south-west and Wales and across to East Anglia and London".
"It's kind of pivoting in place and it's not really moving very far".
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Some injuries from slips and falls on icy surfaces could also occur and the public are urged to take care travelling this weekend, allowing extra time and packing water to stay hydrated.
A yellow alert is in place until midday tomorrow and covers northern Scotland, most of Northern Ireland, the eastern coast of England and the west coast of Wales.
"Into the afternoon those showers will go into the Pennies and the Peak District as well", Ms Smith said.
Temperature in parts of Aberdeenshire, in Scotland hit -14.5C, the lowest temperature recorded anywhere in the United Kingdom since 2012.
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He sees the Lima region's high temperatures on Wednesday being minus 7 degrees with a low being minus 22. He said city agencies are making sure homeless people are in shelters or offered space in warming buses.