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Derek is off today so Sue Charles has kindly picked up the weather mantle.

We've just had the coldest night of year so far especially in Powys where temperatures fell to -11 Celsius near Llanwrtyd Wells and -9 In Newbridge on Wye!

But there's a big change this weekend as a battle takes place between cold arctic air to the east and mild Atlantic air to the west.

This is called a dividing line, a battlefront between two air masses.

But today is the last of the cold, bright days with plenty of sunshine and patchy cloud developing in the west but temperatures struggling to get much above freezing.

Tonight we'll start to see some changes as it turns cold and frosty again in the east with cloud beginning to push in from the west.

It will be a very cold night again tonight with temperatures well below freezing in mid Wales.

As the cloud brings in milder air from the Atlantic a front pushes in from the west which will probably bring rain with it from Anglesey all the way down to Pembrokeshire which could turn to snow as it pushes east wards.

2-5 cm of snow is possible in the hills nearer the border but any snow should turn to rain again later in the day.

However if the cold air stays in place for longer as the front stalls, there will be a greater risk of snow. Timing is variable here, so a snow warning is in place but heavy snow is looking less likely.

The rain continuesÌýthrough Saturday night and there will be a risk of ice into Sunday. It should however be drier with some bright spells and less cold, with top temperatures between 5 and 8 Celsius.

By the evening it will be turning cloudier with rain in the west.

It's looking milder in Dublin for Wales 6 nations opener but turning increasingly damp through the day.

So all in all a very changeable weekend - starting cold then turning milder with a cloudy and dull day for Monday.

Check the for details of weather warnings currently in place for Wales.

Enjoy the rugby on Sunday as Wales take on Ireland in Dublin and travel safely on the roads if you're heading down to catch the ferry.

You can catch all the action from 2.30 pm on Â鶹Éç One Wales and also listen to the match on Radio Wales.

Have a great weekend.