Brecon Beacons
Includes all higher summits in the southern half of Wales: the Bannau Brycheiniog / Brecon Beacons National Park, southern Cambrian Mountains and highest Preseli hills.
Sunday's Forecast
Severe gale or storm, mobility very difficult
Severe conditions on the mountains, any movement very challenging, you may be blown over. 55-70mph+
Snow and rain mix
Precipitation falling as snow on higher summits, at least part of the day. All falling as rain on lower and mid slopes, may even turn to rain higher up.
Cold
Air temperatures near or below freezing on high tops; if exposed to brisk winds significant chill factor on high mountains. Carry suitable clothing.
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Severe gale or storm, mobility very difficult
Severe conditions on the mountains, any movement very challenging, you may be blown over. 55-70mph+
Snow and rain mix
Precipitation falling as snow on higher summits, at least part of the day. All falling as rain on lower and mid slopes, may even turn to rain higher up.
Cold
Air temperatures near or below freezing on high tops; if exposed to brisk winds significant chill factor on high mountains. Carry suitable clothing.
Viewing Forecast For
Brecon Beacons
Sunday 22nd December 2024
Last updated
Sat 21st Dec 24 at
12:03PM
Summary for all mountain areas
Very severe conditions due to widespread storm force northwesterly winds across the mountains. Frequent snow showers will come in off the sea, extending well inland and in some areas merging to give almost constant snow and whiteout for a few hours.
Headline for Brecon Beacons
Storm force upland wind. Snow showers.
How windy? (On the summits)
Northwesterly 55mph.
Effect of the wind on you?
Arduous walking on lower slopes, whilst higher up severe wind chill and any mobility challenging, particularly near precipitation.
How Wet?
Showers, snow higher areas
Snow and hail showers, sometimes frequent; mostly rain below 400, later 500m. Least precipitation east Wales, where frequently dry.
Cloud on the hills?
Extensive on higher areas
Near precipitation cloud sometimes below 400m particularly west Wales, but breaks to 750m. Summits in east Wales may well frequently clear.
Chance of cloud free summits?
40%
Sunshine and air clarity?
Sunshine, mainly east Wales; only occasional sun west. Very varied visibility, sometimes excellent, but appalling in snow.
How Cold? (at 750m)
0C, slight rise through day. Will feel as cold as minus 18C directly in the wind.
Freezing Level
600m; will rise marginally through daylight.
Viewing Forecast For
Brecon Beacons
Monday 23rd December 2024
Last updated
Sat 21st Dec 24 at
12:03PM
How windy? (On the summits)
Northwesterly; 25 to 30mph.
Effect of the wind on you?
Fairly small lower summits, but anticipate periods of considerable wind chill and walking markedly impeded by the wind.
How Wet?
Rain spreading east
The odd shower, snow above600m morning. Occasional rain, or possibly temporarily snow or refrozen rain above 650m, spreading slowly east middle of day or afternoon.
Cloud on the hills?
Deteriorating as cloud later envelops lower slopes
Cloud lifting off the summit, particularly east Wales for most of the day . But anticipate cloud to lower onto the hills from west as rain approaches.
Chance of cloud free summits?
70% later dropping from west to 20%
Sunshine and air clarity?
Little or no sunshine as cloud thickens from west. Visibility very good; later poor in rain.
How Cold? (at 750m)
0C rising slowly through afternoon. Will feel as cold as minus 8C directly in the wind.
Freezing Level
Near or in afternoon increasingly above highest tops.
Viewing Forecast For
Brecon Beacons
Tuesday 24th December 2024
Last updated
Sat 21st Dec 24 at
12:03PM
How windy? (On the summits)
Westerly 15 but on some slopes 20 to perhaps 25mph.
Effect of the wind on you?
Often fairly small, but sudden gusts in places, including on some lower slopes.
How Wet?
Drizzly, mainly west Wales
Drizzle frequent Cambrian and Preseli. Elsewhere, drizzle rare - if any.
Cloud on the hills?
Blanket of cloud across even most lower slopes.
Cloud base widely below 300m Cambrian and Preseli. Eastward, the cloud a little higher, but rarely above 600m.
Chance of cloud free summits?
Less than 10%
Sunshine and air clarity?
Sunshine rarely coming through some valleys, mainly east Wales. Poor visibility west Wales, particularly in drizzle, but very good or excellent easternmost Wales.
How Cold? (at 750m)
9C. Will feel close to freezing point where exposed to the wind
Freezing Level
Above the summits.
Planning Outlook
A change in the weather pattern from Tuesday as high pressure progressively envelops Wales and England. Here (and also in S Scotland), extensively dry and the and progressively dropping, initially across Wales. Mild - although frost in valleys some nights. Still windy Scottish Highlands, here very mild with lying snow substantially melting. Rain frequent NW Highlands, and less so W Highlands. Further east little or no rain.