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Yellow Warning Weather warnings issued for the United Kingdom

Brecon Beacons

Weather hazards over 300m on Fri 29 Aug 2014

High risk

Gales
Southwesterly winds 35-40mph with gusts up to 50-55mph across summits and ridges.
Persistent extensive hill fog
Hill fog becoming widespread and lingering throughout the day, lowest bases in the west.

Medium risk

No medium risks
none

Low risk

Severe chill effect
Wind chill making it feel closer to 3 or 4C across the summits.
Heavy persistent rain
Showery outbreaks of rain, becoming heavy and persistent across western hills by midday.

No risk

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

Fri 29 Aug 2014

Cloud will thicken and lower through the night with some showery outbreaks of rain and drizzle developing. These showery outbreaks of rain will merge into longer spells of rain into the afternoon with some heavy rain likely, especially across western hills. This rain will linger through much of the afternoon, before easing away through the evening. It will be a windy day with southwesterly gales leading to significant buffeting, especially across exposed ridges and summits where there will be a marked wind chill.

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
Cloudy Light rain Light rain Light rain Heavy rain Light rain Light rain Cloudy
Precipitation probability
50% 50-70% 50-70% 60% 90% 90% 70% 30%

Visibility

Generally good below the cloud bases, but moderate to poor in the showers/rain and very poor where shrouded in the cloud.

Hill Fog

Cloud bases will thicken and lower through the night, becoming extensive around 500-700m by dawn. Cloud is likely to shroud the hills for much of the day with the best chance of some clearances across eastern hills in the morning and evening.

Max wind above 400m

Southwesterly 35-40mph with gusts up to 50-55mph across summits and ridges, easing to westerly 25-30mph through the evening.

Temperature

Valleys:
Plus 11 becoming 18 Celsius
800m:
Plus 9 or 10 Celsius
Freezing level:
Above the summits.

Recent Rainfall

Location:
Neuadd Rain (near Pontsticill)
Altitude:
353 m
Rainfall measured at:
1500 on Thu 28 Aug 2014
Last 24 hours:
5.0 mm
Last 48 hours:
5.4 mm
Last 72 hours:
13.4 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: 1745 on Thu 28 Aug 2014

Sat 30 Aug 2014

It will be a rather cloudy morning with some showery outbreaks. However, by midday, the showers will become well scattered and sunny spells developing. The showers and fresh to strong westerly winds will ease into the evening.

Visibility

Generally very good, but moderate to poor in the showers and less than 100m where shrouded in the cloud.

Hill Fog

Areas of low cloud, extensive across western hills, above 500m overnight. This will lift and break up through the morning with all summits becoming clear of cloud during the afternoon.

Max wind above 400m

Westerly 25-30mph with gusts 40mph across summits and ridges.

Temperature

Valleys:
Plus 10 becoming 18 Celsius
800m:
Plus 10 Celsius
Freezing level:
Above the summits.

Issued at: 1745 on Thu 28 Aug 2014

Sun 31 Aug 2014

After a rather cloudy start with some patchy light rain possible, it will brighten up with some sunny spells developing for a time. However, thickening cloud will bring some outbreaks of rain across the park later in the evening. Moderate becoming fresh southwesterly winds.

Issued at: 1745 on Thu 28 Aug 2014

Mon 01 Sep 2014

Becoming increasingly cloudy with extensive hill fog and patchy light rain and drizzle developing. Moderate southwesterly winds.

Issued at: 1745 on Thu 28 Aug 2014

Tue 02 Sep 2014

Any early hill fog and patchy drizzle will clear away to leave a dry day with variable amounts of cloud and sunny spells. Feeling warm in the sunny spells with light winds.

Issued at: 1745 on Thu 28 Aug 2014