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Heavy Snow In The North VS Heavy Rain, Gales & Thunder In The South. Then Storm Dylan Sunday
Blog by Nick Finnis
29th December 2017 11:13

Heavy Snow In The North VS Heavy Rain, Gales & Thunder In The South. Then Storm Dylan Sunday

The UK is experiencing a real mix of weather this morning. We had temperatures fall as low as -12C in the Hghlands this morning; heavy snow is affecting parts of Scotland and Northern England - causing some travel disruption; hail and thunder have been affecting southern parts of Wales and southern England; winds have been gusting between 60-70mph along the south coast; and heavy rain has been bringing some difficult travel conditions.

Low temperatures this morning in Scotland

Following a sweep south of polar air earlier in the week, some cold air had built up and stagnated across northern areas these last few days, in the Highlands of Scotland, temperatures fell to -12C at Loch Glascarnoch and -10C at Aviemore overnight. A risk of ice across Scotland with temperatures close to freezing and snow arriving from the southwest. Then on Sunday, severe gales are expected across Northern Ireland and southern Scotland, as Storm Dylan moves across the far north.

Temperatures earlier this morning

Snow for Scotland & northern England

An Atlantic frontal system moving in from the west and bumping into the stagnant cold air across northern areas is producing snow inland across Scotland and across northern England over the Cumbrian Fells, Pennines and east of the Pennines where cold air is trapped. Earlier snow across NW England tending to turn to rain, as less cold air moves in from the south, but to the east of the Pennines over NE England and across much of Scotland away from the west coast it may remain as snow as these areas stay north of the frontal boundary pivoting around an area of low pressure moving east across the Borders today.

A Met Office AMBER weather warning for snow has been issued for central parts of northern England, with accumulations of 5-10cm, locally 15cm.

A Met Office YELLOW weather warning for snow has been issued for the rest of northern England along with central and southern Scotland, with accumulations of 0-3cm at low levels, 2-5cm above 100m and 10-15cm above 250m.



The rain, sleet and snow should clear much of northern England through the day, though may linger along North Sea coasts and the snow looks to linger from the central belt of Scotland northwards on the northern flank of that low sliding east to the south across the Borders.

 

Heavy rain, strong winds and heavy showers with hail and thunder for southern areas.

Further south across England and Wales, there’s been some snow over the mountains of north Wales, but for many it’s been a rather wet rather than white start to the morning. Bands of heavy squally rain have spread east across many areas, with some embedded thunderstorms in these rain bands across south Wales and SW England as far east as Hampshire. Although the more persistent heavy rain is now clearing east, with some brighter spells moving in from the west, it will turn increasingly windy across the south, with some squally heavy showers accompanied by hail, thunder and strong, perhaps damaging wind gusts, spreading east across southern counties of England and Wales through the day. Already some lightning being detected across SW England and south Wales associated with these showers.

A Met Office YELLOW weather warning for wind has been issued for the south of Wales, SW England and English Channel coast, as far east as West Sussex. Gusts of 45-50mph likely widely in and near showers, gusts of 60mph in places and 70mph with exposure.

Wind gust of 68mph recently recorded at Thorney Island in coastal West Sussex, an isolated rather high gust, perhaps associated with a heavy shower, with gusts elsewhere along the south coast of 40-50mph and up to 50-60mph in a few spots being recorded. Netweather have issued a convective / storm forecast - with a risk of damaging wind gusts and also an isolated tornado from heavy showers and thunderstorms affecting SW UK today:

With the heavy bursts of rain today falling on increasingly saturated ground, there could be some localised  flooding issues. Another spell of rain is forecast for Saturday across England and Wales, and further rain looks to return across southern counties on Sunday and perhaps yet another spell of heavy rain in the far south Monday.

Flood Warnings & Alerts for England & Wales

So there could be an increasing issue with flooding as levels rise in rivers and streams along with run-off from fields and blocked drains. Certainly there will be some difficult driving conditions over the weekend and start of the New Year to bear in mind.

Storm Dylan late Saturday into Sunday morning

Met Eireann have just named a deepening depression crossing Scotland early Sunday, which they forecast will bring 70-80mph wind gusts early hours of Sunday morning across Northern Ireland and southern Scotland

Useful links

Met office Weather Warnings

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England and Wales Flood Alerts & Warnings

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