Black Mountain (Fan Brycheiniog and Fan Foel) from Glyntawe walk

Remaining cold with some snow and ice next week.

Today:

A gloomy, chilly start with occasional drizzle and hill fog in places. Perhaps a little brightness developing, especially in the west, but many places could remain rather grey and cold. A few showers may run into coastal areas. Maximum Temperature 8C.

Tonight:

Patchy rain and hill snow will move down from the northwest through the evening, before fizzling out later. As cloud breaks develop, a widespread frost will form later. Minimum Temperature -6C.

Monday:

Perhaps some low cloud at first across east Wales, otherwise a bright and frosty start. Then a few showers through the afternoon, ahead of heavy overnight rain and hill snow. Maximum Temperature 8C.

Outlook for Tuesday to Thursday:

Tuesday could start icy, with wet and windy weather having cleared east. Then a day of blustery, wintry showers, with snow accumulating on hills. Generally drier thereafter, with night frosts.

Day 6 to 15

Thursday and Friday will see a very cold north to north-easterly airstream bringing sunshine and showers, the showers giving rain or snow and most frequent in the north and northeast. It looks breezy on Thursday perhaps with coastal gales in the south and east, although winds should ease on Friday. Widespread locally severe night frosts are also likely. Later on Friday, rain preceded by snow may arrive in the far west and northwest, accompanied by strengthening winds. During the weekend and following week a lot of fine weather is expected with the chance of some wintry showers. Staying cold or very cold, with widespread frost. However, some wet and windy weather is likely in the northwest, which may briefly spread further southeast giving some snow on encountering the colder air.

Day 16 to 30

The northwest of the British Isles may see changeable conditions at first, with spells of rain, strong winds and some snow at times. However, it should become drier, brighter but colder here as the period unfolds. Meanwhile further southeast some bright, quiet periods are expected but with some wintry showers too, the detail of which is very uncertain. It is likely to be cold or very cold, and as a result widespread, locally severe frosts are on the cards. The conditions described above could still be interspersed by some milder, wetter interludes, most likely across southern parts of the British Isles, and this would bring an associated risk of significant snow and ice at times.

Met Office : WL : 2019-01-20T01:56:15

Issued: 0600 on 2019-01-20 for Brecon Beacons

Today	Rather cloudy, but generally dry. A few light showers, perhaps snow on summits. Cold. Summary Rather cloudy for much of the day but generally dry. A few outbreaks of mostly light rain or summit snow are possible, but not expected to bring any notable accumulations on paths or rocks. Perhaps the odd brighter spells during the afternoon. Cloud thickening again during the evening. Chance of Cloud free tops Near zero during the morning, with cloud obscuring summits above 400m. This increasing to 20% for a time during the afternoon, with cloud lifting to around 600m, and a few breaks developing. Ground conditions Visibility Good falling to just a few kilometres in showers. Severe Chill Effect: Low Likelihood Poor Visibility: High Likelihood 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 Weather Cloudy Cloudy Cloudy Cloudy Cloudy Cloudy Rain 10% 10% 10% 10% 20% 20% Temp (tops) 2 2 3 3 2 1 Wind (tops) 5 7 8 11 11 10 Freezing Level 1000m 1000m 900m 900m 800m 900m
Day 1	Dry, cold overnight. Cloud thickening from the west through the morning with only limited sunny spells. Some light snow possible through the afternoon. Turning windy, with a band of heavy rain and snow arriving during the late evening. Snow initially restricted to summits, but falling to lower levels later. Ice 200m, rising to 600m through the day. Falling to 400m during rain and snow band. Visibility Excellent at first, outside of some valley freezing fog patches. Falling to become moderate to poor into the evening in rain, and down to near zero on the summits as blizzard conditions develop. Wind Light, variable overnight, increasing to Southerly 20mph gust 35mph by midday, then southwesterly 30mph gusts 40-50mph with rain and snow band. Temp Minus 2 Celsius at first, rising to Zero Celsius for a time. (at high level)
Day 2	Frequent heavy snow showers, with a risk of thunder, will lead to accumulations of snow, especially on tops. Paths likely obscured and icy. Some brighter spells between snow showers, but staying cold, with a wind chill. Freezing levels 200m, but snow likely to fall down to valley level during heavy showers.
Day 3	Further heavy snow showers likely overnight, but gradually easing through the day. Likely dry, but cloud thickening later. Freezing levels near valley level at first with icy routes likely, before rising to 800m
Day 4	Very uncertain at this stage, but a thaw currently suggested, with freezing levels rising above summits, outbreaks of rain, and cloud obscuring the tops.

Data: Met Office