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Brecon Beacons

Weather hazards over 300m on Sun 22 Jan 2017

High risk

No high risks
none

Medium risk

Persistent extensive hill fog
Some hill fog above 400 to 500 metres may make navigation difficult at times.

Low risk

Severe chill effect
Cold, especially when exposed to the wind. Warm layers essential.

No risk

Blizzards
none
Heavy snow
none
Storm force winds
none
Gales
none
Thunderstorms
none
Heavy persistent rain
none
Strong sunlight
none

Sun 22 Jan 2017

A rather cloudy start, with some light snow showers possible, perhaps bringing a slight covering to some hills. However most routes will remain dry, with sunny spells developing, especially by the afternoon. Freezing levels will also rise, leading to any showers turning increasingly to rain below 800m.

Time
0600 to 0900 0900 to 1200 1200 to 1500 1500 to 1800 1800 to 2100 2100 to 2400
Weather
Cloudy Cloudy Cloudy Cloudy Cloudy Partly cloudy night
Precipitation probability
20% 20% 20% 20% 10% 0%

Visibility

Generally good, but moderate or poor in showers and very poor in any hill fog.

Hill Fog

Broken at times above 400metres.

Max wind above 400m

Southeast 20-25mph.

Temperature

Valleys:
Minus 1 Celsius, rising to plus 4 Celsius.
800m:
Minus 1 Celsius, rising to plus 1 Celsius
Freezing level:
All levels at first, rising to 400m by noon, and just above the highest summits by dusk.

Recent Rainfall

Location:
Neuadd Rain (near Pontsticill)
Altitude:
353 m
Rainfall measured at:
0300 on Sun 22 Jan 2017
Last 24 hours:
0.0 mm
Last 48 hours:
0.0 mm
Last 72 hours:
0.2 mm

Rainfall data provided by the Environment Agency. The Met Office is not responsible for content provided by third parties and may remove this data without warning.

Mon 23 Jan 2017

Mist and fog is possible in some valleys at first, but this lifting through the morning to give a generally bright and frosty start. It will be a generally dry day with some sunny spells. However some hills could see hill fog, only clearing later in the day.

Visibility

Moderate or poor at first, becoming generally good. Very poor in any hill fog and valley fog.

Hill Fog

Patchy above 300m during the . Most hill clearing during the afternoon.

Max wind above 400m

Southwest 15-20mph.

Temperature

Valleys:
Minus 1 Celsius, rising to plus 4 Celsius.
800m:
Zero Celsius, rising to plus 2 Celsius.
Freezing level:
800m, rising just above the summits during the afternoon

Tue 24 Jan 2017

Another dry and bright day with patches of hill fog, after a misty and frosty start. It will feel chilly throughout with a strengthening south to southwest breeze. Freezing level around or just above the highest summits.

Wed 25 Jan 2017

Dry and bright with sunny spells after any early mist clears. Becoming windy in a strengthening south to southwest wind and feeling cold. Freezing level remains around the highest summits.

Thu 26 Jan 2017

Remaining mostly dry but rather cloudy at times, with a fresh to strong southerly wind and freezing level remaining around the highest summits.

Issued at: 0347 on Sun 22 Jan 2017