Brecon Beacons
Includes all higher summits in the southern half of Wales, including highest point in Preseli Hills.
Viewing Forecast For
Brecon Beacons
Friday 4th December 2020
Last updated
Thursday 3rd December 2020 at
4:25 PM
Summary for all mountain areas
Areas of snowfall will pivot in from the east to affect many areas of Scotland and Northern England through the day. Accompanied by upland gales giving severe wind chill for periods, but a substantial lull is likely S Pennines. Across Wales, snow showers later give way to persistent snow.
Headline for Brecon Beacons
Severe wind chill. Snow showers, may become persistent later.
How windy? (On the summits)
North or northwesterly, but very likely a lull for a time, but for periods risk 30-40mph high tops.
Effect of the wind on you?
Prepare for arduous conditions and severe wind chill on higher terrain.
How Wet?
Snow showers, persistent later.
Occasional showers spreading from the northwest, may be frequent western areas, particularly Preseli hills. Snow or sometimes hail to low levels. Often sleety in valleys. Risk persistent rain/snow later in afternoon.
Cloud on the hills?
Breaks to some tops, later lowering in snow.
Varied: Banks of cloud covering higher tops at times, most common toward west Wales, below 600m around showers. Areas toward Black Mountains may be often clear. Later extensive should snow become persistent.
Chance of cloud free summits?
60%, later 30% in persistent snow.
Sunshine and air clarity?
Brief glimpses of sun. Visibility varied, often very good, but reduced markedly around showers.
How Cold? (at 750m)
-3C, may rise marginally. But feeling closer to -16C in direct exposure to strongest winds.
Freezing Level
Terrain frozen into valleys in morning. Rising to 500-600m.
Viewing Forecast For
Brecon Beacons
Saturday 5th December 2020
Last updated
Thursday 3rd December 2020 at
4:25 PM
How windy? (On the summits)
East or southeasterly, 15 to 25mph.
Effect of the wind on you?
May impede ease of walking in places. Significant wind chill on high tops.
How Wet?
Generally dry
Rare snow flurries.
Cloud on the hills?
Risk fog banks east
Patches of cloud capping higher tops at times. Risk of some low level freezing fog banks, most likely east Wales, where may lift on to some hill slopes and linger.
Chance of cloud free summits?
60%
Sunshine and air clarity?
Occasional sun, mostly west. Visibility very good in places, but locally reduced around cloud banks.
How Cold? (at 750m)
-2C
Freezing Level
Terrain widely frozen. Partial thawing in sunlight up to about 500m.
Viewing Forecast For
Brecon Beacons
Sunday 6th December 2020
Last updated
Thursday 3rd December 2020 at
4:25 PM
How windy? (On the summits)
Low confidence in detail: North to northwest 10-15mph.
Effect of the wind on you?
Mostly small.
How Wet?
Risk snow showers, rain lower slopes.
Clusters of showers may give snow, rain below 500m, on and off for a few hours. Much uncertainty over this though, may amount to very little and be often dry.
Cloud on the hills?
Fairly extensive
Fairly extensive cloud will very likely cover the hills. Bases varying, but at times though the day to lower slopes.
Chance of cloud free summits?
30%
Sunshine and air clarity?
Mostly cloudy. Visibility fairly murky and poor or very poor in snow/rain.
How Cold? (at 750m)
Around 0C
Freezing Level
Around 800m.
Planning Outlook
Cold weather patterns are likely to prevail well into December. A period of constant freeze, at least on the Scottish Munros, but often near or below zero on many lower summits across Britain. Upland terrain becoming extensively snow covered as bands of precipitation circulate slowly around low pressure - substantial snowfalls likely across many uplands, and snow may well lie for periods to lower slopes. Wind speed and direction will vary considerably, occasionally gale force. An east or northeasterly common across northern Britain.