Weekend weather and the Foehn Effect

Thursday 10 February 2011, 14:29

Derek Brockway Derek Brockway

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The weather's been a bit up and down this week. Fine one day, rain the next, and quite mild. Yesterday Bodelwyddan in Denbighshire reached 12.7 Celsius, 55 Fahrenheit with a southerly breeze, making it the warmest place in Britain. The rise in temperature was partly due to the Foehn effect whereby, in this case, warm moist air blowing across the Snowdonia mountains dries out and warms as it descends on the other side.

The north Wales coast has had some notable out-of-season heat-waves, thanks to the Foehn effect. Aber, near Llandudno, has recorded 18.3 Celsius in January and 21.3 Celsius in November, while in February 1998, 18.1 Celsius was recorded in Prestatyn.

Tomorrow will continue mild with some rain late morning and during the afternoon. This will clear on Friday evening leaving a dry and colder night with a touch of ground frost.

Saturday will be a decent day, with the odd shower in places but otherwise dry with bright skies, sunshine and feeling fresher. Highs of seven to nine Celsius with a light to moderate west to south-westerly breeze backing southerly later and freshening.

If you're heading to Scotland for the rugby, expect some rain in Edinburgh on Friday afternoon and on Friday night but this will clear leaving Saturday dry with some sunshine. Highs around seven Celsius so not too cold.

On Sunday it's all change again. Wet and breezy in the morning with fresh to strong winds but turning drier and brighter during the afternoon with a couple of showers.

So Saturday's the best day of the weekend for going for a walk - I may see you up the Blorenge!

Lastly, here's a lovely photo of the Wye Valley from the top of Clyro Hill, sent in by Beth Clarke:

Wye Valley by Beth Clarke

Wye Valley by Beth Clarke

Derek

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