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Brecon Beacons

Weather hazards over 300m on Fri 28 Nov 2014

High risk

Persistent extensive hill fog
Extensive hill fog likely in the east, but western hills may see some clearances.

Medium risk

No medium risks
none

Low risk

Gales
Southeasterly gusts will reach 50mph at times across highest summits and exposed ridges.

No risk

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

Fri 28 Nov 2014

A rather cloudy start across the park with southeasterly winds increasing. The best of the breaks will be in the west where it may be rather cold through the valleys. A windy day will follow across the park with hill fog, especially across eastern hills. The winds will likely reach gale force over the highest summits with some strong gusts likely to the west of ridge lines, resulting in considerable buffeting. Given the flow orientation, the best of the brighter breaks will be to the across western hills where it may become very mild during the afternoon. Eastern areas will remain cloudier with patchy light drizzle.

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 Cloudy
Precipitation probability
20% 20% 20% 20% 10% 10%

Visibility

Generally moderate or good below the cloud bases, but poor in the drizzly outbreaks and very poor where shrouded in the cloud.

Hill Fog

Hills widely foggy throughout the day across eastern hills with the lowest bases around 300-500m, lifting a little through the day. The best of the breaks will be across western hills where cloud bases will be more broken around 500-700m leading to some clearances at times.

Max wind above 400m

East or southeasterly 30-40mph, with gusts up to 50mph across summits and exposed ridges. Some strong gusts are possible across lower slopes to the west of major ridges.

Temperature

Valleys:
Plus 5 becoming 10-12 Celsius, but locally 13 Celsius in the west.
800m:
Plus 6 becoming 10 Celsius
Freezing level:
Above the summits.

Recent Rainfall

Location:
Neuadd Rain (near Pontsticill)
Altitude:
353 m
Rainfall measured at:
0300 on Fri 28 Nov 2014
Last 24 hours:
0.2 mm
Last 48 hours:
2.0 mm
Last 72 hours:
2.2 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.

Issued at: 0321 on Fri 28 Nov 2014

Sat 29 Nov 2014

A mostly dry and increasingly sunny day, especially in the west where it will become very mild. Summit temperatures will also be warm for the time of year due to a strong temperature inversion. However, areas of low cloud below the inversion may give some hill fog across lower slopes in the east at times, especially during the morning. Through the evening, some valley fog patches and areas of low cloud will reform.

Visibility

Generally moderate or good, but perhaps quite hazy at low levels at times. However, the highest summits will have excellent visibilities above the temperature inversion.

Hill Fog

Quite extensive through the night, especially in the east. However, these areas of low cloud will break up and largely disperse leaving many hills clear of cloud. However, some patches may linger on lower slopes in the east, before becoming more extensive through the evening.

Max wind above 400m

Easterly 20-30mph, easing through the day and become light later.

Temperature

Valleys:
Plus 6 becoming widely 12-13 Celsius, and perhaps locally 14 Celsius in the west.
800m:
Plus 11 or 12 Celsius
Freezing level:
Well above the summits.

Issued at: 0321 on Fri 28 Nov 2014

Sun 30 Nov 2014

Another mostly dry day, but with more cloud than Saturday which will give quite extensive hill fog. However, the highest summits will likely poke above the cloud leading to sunny conditions here with excellent visibilities. Feeling colder in the valleys than Saturday, especially in the east. However, temperatures increasing with height leading to very mild summit temperatures for the time of year.

Issued at: 0321 on Fri 28 Nov 2014

Mon 01 Dec 2014

Plenty of cloud on Monday giving some hill fog. The cloud will thicken further from the northwest later in the day bringing outbreaks of rain and drizzle to the park by late afternoon and evening. Less mild across the summits than of late. Clearer air and strengthening north-westerly winds will filter in across the park overnight.

Issued at: 0321 on Fri 28 Nov 2014

Tue 02 Dec 2014

A brighter, but much colder day, across the park with sunny spells and fresh north-westerly winds.

Issued at: 0321 on Fri 28 Nov 2014