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yellow Warnings have been issued for the United Kingdom

Brecon Beacons

Weather hazards over 300m on Thu 27 Nov 2014

High risk

Persistent extensive hill fog
Hills will be widely foggy throughout much of the day with the lowest bases in the east.

Medium risk

Severe chill effect
Feeling as cold as zero across the mountain tops through the evening.

Low risk

No low risks
none

No risk

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

Thu 27 Nov 2014

A rather cloudy and grey start to the day across eastern hills with extensive hill fog and perhaps some patchy drizzle. The best of the brighter breaks in the cloud will be across western hills where cloud bases will be highest. Winds will increase later in the day with strong southeasterlies developing by evening leading to a significant wind chill.

Time
0600 to 0900 0900 to 1200 1200 to 1500 1500 to 1800 1800 to 2100 2100 to 2400
Weather
Cloudy Cloudy Sunny intervals Cloudy Cloudy Cloudy
Precipitation probability
20% 10% 10% 10% 10% 20%

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

Blanket cloud giving extensive and persistent hill fog above 400 metres in the east, with patches down to 200 metres. However, bases more broken in the west with higher bases around 500-700m and some summits perhaps clearing at times during the afternoon.

Max wind above 400m

Southeasterly winds strengthening through the day reaching 35-40mph by evening.

Temperature

Valleys:
Plus 2 becoming 9 Celsius
800m:
Plus 3 becoming 5 or 6 Celsius by evening.
Freezing level:
Above the summits.

Recent Rainfall

Location:
Neuadd Rain (near Pontsticill)
Altitude:
353 m
Rainfall measured at:
0300 on Thu 27 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: 0351 on Thu 27 Nov 2014

Fri 28 Nov 2014

A windy day across the park with hill fog, especially eastern hills. The winds will possibly gust to gale force over summits and some strong gusts are possible 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 drizzly outbreaks. Despite the mild temperatures, it will feel closer to 4 or 5C across the summits.

Visibility

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

Hill Fog

Hills widely foggy throughout the day with the lowest bases around 300-500m across eastern hills. Bases will be around 500-700m and more broken across western hills, perhaps allowing temporary clearances to summit level.

Max wind above 400m

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

Temperature

Valleys:
4 becoming 10-12 Celsius, but locally 14 Celsius in the west.
800m:
Plus 6 becoming 11 Celsius
Freezing level:
Above the summits.

Issued at: 0351 on Thu 27 Nov 2014

Sat 29 Nov 2014

A mostly dry day with plenty of cloud, but some brighter spells are likely to develop through the day, especially across western parts where it may well become locally very mild. Cloud may be low enough for some hill fog at times, especially in the east. Winds also easing during Saturday. Very mild summit temperatures.

Issued at: 0351 on Thu 27 Nov 2014

Sun 30 Nov 2014

Another mostly dry day with variable amounts of cloud and some brighter spells developing. Temperatures increasing with height with very mild summit temperatures. Light winds.

Issued at: 0351 on Thu 27 Nov 2014

Mon 01 Dec 2014

A good deal of cloud on Monday with light winds. The best of any breaks will be across western hills. Feeling colder through the valleys, but temperatures increasing with height.

Issued at: 0351 on Thu 27 Nov 2014