Diffwys (Gwynedd) weather

Headline:

Storm Bert to bring possible disruption this weekend.

Today:

A chilly start with sleet and snow showers. These easing into the afternoon to leave some bright or sunny spells. Another cold day, though winds falling lighter later. Maximum temperature 7 °C.

Tonight:

Dry but chilly evening. Cloud building overnight ahead of Storm Bert's arrival with rain becoming widespread and brief hill snow across Eryri. Patchy frost abating as the rain arrives. Minimum temperature 1 °C.

Saturday:

Storm Bert bringing a widely unsettled and potentially disruptive day with heavy, persistent rain and gales, severe along coasts. Turning noticeably milder, resulting in a rapid melt of lying snow. Maximum temperature 13 °C.

Outlook for Sunday to Tuesday:

Rain clearing through Sunday with showers and brighter spells on Monday and Tuesday. Strongest winds easing but staying blustery. Mild on Sunday then temperatures returning to the seasonal average.

An unsettled start, with rain or showers in places, and perhaps also some strong winds for a time. Temperatures back towards average for most places, but still mild in the southeast. High pressure is likely to build for a time, particularly across northern areas, bringing an increased risk of some fog and frost. However, this is likely to migrate eastwards during the second half of next week, potentially allowing some outbreaks of rain to move into some western and perhaps southern areas. Into December, and while signals are mixed it looks most likely that high pressure may re-assert itself close to or over the UK, with temperatures generally near average, but some overnight frost is likely, and rather cold by day where any fog persists.

The start of this period looks like being largely settled, with high pressure close to if not over the UK. However. there is also a chance of more changeable weather patterns, which would see Atlantic weather systems periodically move across the country. These will bring some wetter and windier interludes with a risk of some snow, especially for hills in the north. These conditions look more likely to dominate towards the middle of December. Temperatures generally close to average through the period.