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Brecon Beacons

Weather hazards over 300m on Wed 22 Oct 2014

High risk

No high risks
none

Medium risk

Severe chill effect
Low temperatures coupled with strong winds at height, will provide a significant chill effect.
Persistent extensive hill fog
Hill fog may become extensive across western hills in the evening.

Low risk

Gales
Northwesterly winds may reach gale force through the early hours, before easing later.

No risk

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

Wed 22 Oct 2014

A dry early morning period, with clear spells. Given some shelter, a patchy frost is possible. Winds will continue to be strong at height, and coupled with low temperatures, this will make it feel very cold. After dawn, cloud will steadily invade from the west, lowering onto western hills by mid to late evening. A few spots of drizzle are possible after dark. Winds will moderate a little, but remain noticeably strong over exposed summits and ridges.

Time
0000 to 0300 0300 to 0600 0600 to 0900 0900 to 1200 1200 to 1500 1500 to 1800 1800 to 2100 2100 to 2400
Weather
Partly cloudy night Partly cloudy night Sunny intervals Sunny intervals Cloudy Cloudy Overcast Drizzle
Precipitation probability
0% 0% 0% 0% 0% 10% 10% 40%

Visibility

Very good at first, becoming moderate or good later. Visibilities will become poor or very poor at times later in hill fog or drizzle.

Hill Fog

Little if any expected until early evening. Patches initially around the summits, will become more extensive and lower to around 400 metres by midnight. Some east facing slopes should remain free of cloud.

Max wind above 400m

Northwesterly 50 mph becoming westerly 35 mph.

Temperature

Valleys:
Plus 3 Celsius becoming plus 12 Celsius.
800m:
Plus 2 Celsius becoming plus 7 Celsius.
Freezing level:
Initially, just above the summits, but rising well above the summits by the end of the day.

Recent Rainfall

Location:
Neuadd Rain (near Pontsticill)
Altitude:
353 m
Rainfall measured at:
1500 on Tue 21 Oct 2014
Last 24 hours:
7.2 mm
Last 48 hours:
9.4 mm
Last 72 hours:
25.0 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.

Issued at: 1734 on Tue 21 Oct 2014

Thu 23 Oct 2014

Generally cloudy throughout, with occasional rain or drizzle and extensive hill fog. Despite this, it will be fairly mild for the time of year, although this tempered by a brisk southwesterly wind at height.

Visibility

Generally moderate at best, and often poor or very poor in drizzle and hill fog.

Hill Fog

Extensive and persistent hill fog above 450 metres for much of the day, although some eastern slopes may see some breaks developing at times.

Max wind above 400m

Southwesterly 30-35 mph.

Temperature

Valleys:
Plus 9 Celsius becoming plus 14 Celsius.
800m:
Plus 7 Celsius becoming plus 9 Celsius.
Freezing level:
Well above the summits.

Issued at: 1734 on Tue 21 Oct 2014

Fri 24 Oct 2014

Cloudy and damp through the early hours, ahead of some heavier and more persistent rain pushing up from the southwest later in the morning. This should clear by nightfall, with much improved visibility, but also a change to cooler conditions.

Issued at: 1734 on Tue 21 Oct 2014

Sat 25 Oct 2014

Breezy with a mixture of sunny spells and just the odd shower. The mountains should be largely free of cloud, with good visibilities on offer. Feeling chilly in the wind though.

Issued at: 1734 on Tue 21 Oct 2014

Sun 26 Oct 2014

A very similar day on Sunday compared with Saturday, although perhaps with a greater chance of seeing a few showers. Once again, it will feel quite chilly in the wind, especially at height.

Issued at: 1734 on Tue 21 Oct 2014