Pen Allt-Mawr (Powys) weather

Headline:

Largely dry and cloudy, with sunshine in the west.

Today:

Remaining rather cloudy, with the best of the brightness in the west. Cloud thick enough over the hills for some drizzle, but most places remaining dry. Fairly light winds but feeling chilly after a cold start. Maximum temperature 7 °C.

Tonight:

Remaining cloudy this evening with some patchy light rain sinking southwards overnight. Turning drier and colder behind with some clear spells and a touch of frost. Minimum temperature -1 °C.

Tuesday:

Largely cloudy to start with some rain over the hills. Becoming brighter through the afternoon with sunny spells and light winds. Feeling chilly. Maximum temperature 6 °C.

Outlook for Wednesday to Friday:

A cold and frosty New Year's Eve with sunny spells through the day. Showery rain arriving into New Year's Day with the increased risk of wintry showers. Colder and breezier.

Cold northerly winds, initially across Scotland are now expected to become dominant across the whole UK in the first week of January. These will bring wintry showers (often of snow) to many coastlines (and areas just inland of these) that are exposed to onshore winds. Subtle day-to-day changes in wind direction from northeast to northwest will change the places most exposed to the showers, but many inland locations across central and southern areas will remain mostly dry but cold. There are likely to be some more coherent bands of rain, sleet and snow working south, and these may bring a risk of more prolonged wintry precipitation affecting some inland areas. Towards the second half of this period, slightly milder conditions will attempt to move in from the west.

Whilst confidence in details is low, by the start of this period the transition back to westerly winds bringing Atlantic weather systems into the UK is expected to be complete, with temperatures most likely recovering to around average. There is perhaps a weak signal for slowly evolving weather patterns to be more favoured than normal, such patterns increase the chances of frost and fog above normal by night.