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yellow Warnings have been issued for the United Kingdom

Brecon Beacons

Weather hazards over 300m on Wed 28 Jan 2015

High risk

Gales
Means of 40-50 mph likely, with 55-65 mph gusts at times of heavy showers.
Severe chill effect
With subzero day time temperatures and strong winds, it will feel exceptionally cold.

Medium risk

Blizzards
Snow showers combined with strong winds, giving a whiteout later.
Heavy snow
Heavy snow showers later in the day.
Persistent extensive hill fog
Extensive hill fog at first. Reduced risk during the afternoon. Dropping below 500 m with showers.

Low risk

Storm force winds
There is a low risk of winds reaching storm force in association with heavy showers.
Thunderstorms
Low risk of lightning in association with showers.
Strong sunlight
In sunny interludes, reflection from snowpack's poses a low risk.

No risk

Heavy persistent rain
none

Wed 28 Jan 2015

Low cloud, giving hill fog and rain, heavy and squally for a time, will clear during mid-morning. This will leave much colder and brighter conditions. A mixture of sunny spells and scattered snow and hail showers during the afternoon, giving accumulations over high ground. Winds will reach means in excess of 40-50 mph and some isolated storm force gusts. Severe wind chill.

Time
0600 to 0900 0900 to 1200 1200 to 1500 1500 to 1800 1800 to 2100 2100 to 2400
Weather
Heavy shower night Light shower day Sunny intervals Light snow shower day Heavy snow shower night Heavy snow shower night
Precipitation probability
70% 70% 20% 40% 60% 60%

Visibility

Very poor at first, becoming very good or excellent by midday, but temporarily very poor to near zero in snow and hail showers and very poor throughout in hill fog.

Hill Fog

Extensive cloud over the hills during the morning with bases down to 200-400 m. Cloud bases will lift and break up through the morning as clearer, colder air filters down from the north. Thereafter, cloud bases will rapidly fluctuate through the day bringing periods of hill fog above 500 m, with patches down to 300 m in the snow showers. There will be some occasional clearances to summit level, especially in the south.

Max wind above 400m

Means of 40-50 mph likely, with 55-65 mph gusts at times of heavy showers.

Temperature

Valleys:
Plus 7 Celsius at first, falling through the morning to Plus 3 to 4 Celsius.
800m:
Plus 4 Celsius at first, falling through the day to Minus 4 Celsius. Temperatures will feel as low as Minus 15 Celsius in the wind.
Freezing level:
Above the summits at first, rapidly dropping to 400 m through the morning.

Recent Rainfall

Location:
Neuadd Rain (near Pontsticill)
Altitude:
353 m
Rainfall measured at:
0300 on Wed 28 Jan 2015
Last 24 hours:
0.6 mm
Last 48 hours:
5.6 mm
Last 72 hours:
9.0 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: 0600 on Wed 28 Jan 2015

Thu 29 Jan 2015

A mixture of sunshine and snow or hail showers through the day, with accumulations over high ground and sometimes to lower levels too. Winds will be strong to gale force throughout the day with some gusts of 50-60 mph likely. This will make temperatures feel much colder.

Visibility

Generally good or very good outside the showers. Very poor to near zero in snow and hail showers.

Hill Fog

Cloud bases will rapidly fluctuate through the day bringing periods of hill fog above 500 m, with patches down to 300 m in the snow showers.

Max wind above 400m

Means of 35-40 mph with gusts of 55-65 mph at times.

Temperature

Valleys:
Zero to 1 Celsius becoming 3 or 4 Celsius.
800m:
Minus 6 Celsius, although feeling more like Minus 15-20 Celsius in the strong winds.
Freezing level:
Close to freezing down to the valleys, particularly furthest east, rising to 300 m and then 500m by evening.

Issued at: 0600 on Wed 28 Jan 2015

Fri 30 Jan 2015

Remaining breezy and cold, perhaps less so than Thursday. Scattered snow showers will continue, with further accumulations likely.

Issued at: 0600 on Wed 28 Jan 2015

Sat 31 Jan 2015

Turning colder again with northerly winds and isolated snow showers, bringing further accumulations to the mountain range.

Issued at: 0600 on Wed 28 Jan 2015

Sun 01 Feb 2015

Similar story to Saturday, with further scattered snow showers, mainly western hills. Brisk northerly winds will bring a significant wind chill.

Issued at: 0600 on Wed 28 Jan 2015