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Brecon Beacons

Confidence

High for a cool showery day again on Thursday but lower from Friday due to uncertainties regarding track of lows across the southern UK, especially on Friday and Sunday.

  • This evening
  • Thursday
  • Friday
  • Further outlook

Wednesday 25 April 2018

Sunrise: 05:57   Sunset: 20:28
Moon phase: First quarter

Late sunny or clear spells and showers dying out. Strong westerly winds.

Thursday 26 April 2018

Weather hazards

Strong sunlight Medium likelihood Hide detail

Harmful UV levels from sunlight increase with altitude giving a greater risk of sunburn and eye damage, even on some overcast days. On breezy days, the cooling effect of wind on exposed skin may disguise any feeling of sunburn until it is too late. If there is snow cover, glare increases the effect of UV rays especially on the eyes. It is advisable to wear sun block, protective clothing such as a long-sleeved top and hat and have good quality eye protection.

Gales Low likelihood Show detail

Gale force winds (gusts over 50mph) make walking difficult and strenuous with a potential to be blown over by gusts. There is often a marked increase in winds through cols or on exposed ridges and summits. Distances can take longer to cover and compass bearings become harder to follow accurately.

Severe chill effect Low likelihood Show detail

Wind significantly lowers the ‘feels-like’ temperature relative to the actual temperature, with even moderate winds significantly adding to the chilling effect. Strong winds can result in a severe and debilitating wind chill many degrees below the actual temperature. This effect will be enhanced in rain or wet snow. Without protection, prolonged exposure could result in frost nip or frostbite on exposed parts of the body and/or hypothermia.

Poor visibility Low likelihood Show detail

Poor visibility presents challenging route finding conditions. Visibility could be significantly less than 50 metres in all directions with few or no visual references, especially on featureless moors or plateaux. Distances become hard to judge and cliff or cornice edges can be difficult to recognise. These conditions require good navigational skills. There is a risk of white-out conditions when mist or fog is combined with extensive snow cover.

Heavy persistent rain Low likelihood Show detail

Heavy and persistent rain can lead to drenched clothing and footwear with waterproofs often becoming soaked through, especially if accompanied by strong winds. This can lead to significant loss of body heat and an increased likelihood of hypothermia. Terrain may turn increasingly boggy underfoot while streams can flood and become impassable. There may also be a risk of flooding in valleys or glens. If there is snow cover, a heightened avalanche hazard is possible and avalanche reports should be consulted where available.

Headline

Sunny spells and showers. Strong westerly winds easing later

Weather at 600m

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Partly cloudy night Partly cloudy night Sunny intervals Light shower day Light shower day Sunny intervals Sunny intervals Cloudy
10% 10% 10% 30% 40% 20% 10% 10%
Chance of precipitation
900 900 900 900 1,000 1,000 1,000 900
Freezing level (m)
The level above which snow is expected to settle or the ground is expected to be frozen

Wind speed and direction (mph) By altitude above mean sea level

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
600m W 24 31 W 23 30 W 22 29 W 22 30 W 21 30 W 19 28 SW 16 22 SW 12 16
300m W 13 26 W 12 26 W 12 24 W 13 28 W 14 28 W 13 26 SW 10 21 SW 7 14
Valley W 12 26 W 11 25 W 11 24 W 12 27 W 13 28 W 12 26 SW 10 21 SW 6 14

Temperature (°C) By altitude above mean sea level

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
600m 3 2 2 4 6 6 5 3
300m 5 5 5 7 9 10 8 6
Valley 6 6 6 8 10 11 9 6

Feels like temperature (°C) By altitude above mean sea level

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
600m -3 -4 -4 -2 1 1 0 -1
300m 1 1 1 4 7 7 5 3
Valley 2 2 2 5 8 8 6 4
Sunrise: 05:55   Sunset: 20:29
Moon phase: Waxing gibbous

Weather

Mainly dry overnight with some long clear spells. Then a bright day with sunny spells and showers, the showers. The showers gradually die out through the afternoon and the evening then looks dry, although cloud, above the summits, will increase.

Chance of cloud-free mountain/hill tops at 600m

Around 75% with occasional or periods of cloud lowering to 600m at times in or near showers.

Visibility

Very good or excellent falling to several kilometres in showers and a few hundred metres or less in cloud.

Meteorologist's view

A significant chill is expected with temperatures around freezing at height and strong winds, with gusts around 45mph over summits through the morning. Valley temperatures rise to around 12 Celsius by day.

Recent rainfall

  • Location: Neuadd (Near Pontsticill)
  • Altitude: 353m
  • Measurement date: 15:00 on Wed 25 Apr 2018
  • Last 24 hours: 10.8mm
  • Last 48 hours: 19.8mm
  • Last 72 hours: 19.8mm

Rainfall data provided by Natural Resources Wales. The Met Office is not responsible for content provided by third parties and may remove this data without warning.

Friday 27 April 2018

Sunrise: 05:53   Sunset: 20:31
Moon phase: Waxing gibbous

Weather

Cloudy with outbreaks of rain developing through the early hours. Then cloudy for much of the day with persistent and at times heavy rain, although the rain becoming lighter and patchier through the late afternoon and evening.

Maximum wind speed expected

Southwesterly 10-15mph backing easterly 20mph through the morning, then northerly 10-15mph later.

Chance of cloud-free mountain/hill tops at 600m

Becoming near zero by dawn and through much of the day with periods or persistent cloud above 450m developing, with patches below. Chances may increase during the evening as cloud lifts and breaks.

Temperature

  • At 600m Around plus 5 Celsius
  • Valley Around plus 5 Celsius through the early hours rising to plus 10 Celsius by day
  • Freezing level Above the summits.

Visibility

Very good falling to several kilometres in rain and a few hundred metres or less in cloud. .

Saturday 28 April 2018

Sunrise: 05:51   Sunset: 20:33
Moon phase: Waxing gibbous

A bright day with sunny spells and the occasional shower. Mainly light northerly winds. Freezing level above the summits.

Sunday 29 April 2018

Sunrise: 05:49   Sunset: 20:34
Moon phase: Full

Mainly dry and bright, but rather a lot of cloud around. Occasionally fresh northerly winds. Freezing level above the summits..

Monday 30 April 2018

Sunrise: 05:47   Sunset: 20:36
Moon phase: Full

Sunny spells with just a few mainly light showers. Occasionally fresh northeasterly winds. Freezing level above the summits.

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