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Brecon Beacons

Confidence

High to medium, becoming Low to Medium for the detail from later Thursday due to complexity of the lows and fronts pushing east across the UK.

  • This evening
  • Wednesday
  • Thursday
  • Further outlook

Tuesday 17 October 2017

Sunrise: 07:41   Sunset: 18:16
Moon phase: Waning crescent

Dry and partly cloudy with light winds.

Wednesday 18 October 2017

Weather hazards

Poor visibility Medium likelihood Hide 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.

Forecast

A overcast and increasingly misty day with patchy light rain and drizzle from around dawn.

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 Cloudy Light rain Drizzle Light rain Drizzle Light rain
00% 00% 30% 50% 60% 60% 70% 70%
Chance of precipitation
2,700 2,700 2,700 2,600 2,700 2,800 2,500 2,400
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 E 10 15 E 14 21 E 15 22 E 16 24 E 14 20 E 11 14 SE 10 15 S 12 16
300m E 5 10 E 7 14 E 8 15 E 9 17 E 9 16 E 6 11 E 5 9 SE 4 9
Valley E 4 10 E 5 12 E 7 15 E 7 14 E 7 14 E 5 10 E 4 9 E 3 6

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 7 7 7 8 8 9 10 10
300m 9 8 8 9 10 10 10 11
Valley 9 9 9 10 11 11 11 11

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 4 3 3 4 5 7 7 7
300m 7 6 6 7 8 9 9 10
Valley 8 8 7 8 9 10 10 10
Sunrise: 07:43   Sunset: 18:14
Moon phase: Waning crescent

Weather

Some clear spells during the early hours of the morning, but otherwise an overcast day with occasional patchy rain or drizzle, most persistent across southern aspects.

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

Patchy cloud above 500m overnight with a 50% chance of clear summits, becoming 10-25% from dawn with cloud becoming persistent from 300m.

Visibility

Good becoming mainly moderate occasionally poor from dawn.

Meteorologist's view

Mean winds speeds at Valley and 300m levels look to light but gusts seem more realistic

Recent rainfall

  • Location: Neuadd Rain (Near Pontsticill)
  • Altitude: 353m
  • Measurement date: 15:00 on Tue 17 Oct 2017
  • Last 24 hours: 0.2mm
  • Last 48 hours: 0.4mm
  • Last 72 hours: 0.4mm

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.

Thursday 19 October 2017

Sunrise: 07:45   Sunset: 18:12
Moon phase: New

Weather

Overcast skies with patchy rain or drizzle at first, this most persistent across southern aspects. Turning dry with increasing brighter spells through the morning and early afternoon, then cloud building from the southwest late afternoon, bringing a band of locally heavy rain for the evening.

Temperature

  • At 600m Plus 10C lowering plus 7 later
  • Valley Plus 07 increasing 14 during the afternoon, then lowering 10 later
  • Freezing level Above summits

Visibility

Good, occasionally moderate in rain, mainly at first and late

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

15-30% through to mid-afternoon with persisent cloud from 300m, becoming 70% from late afternoon or early evening, then 30% towards midnight.

Maximum wind speed expected

Strong through most of the day with gusts reaching 40mph over exposed ridges and summits. Increasing severe gale late evening with gusts 60mph+

Friday 20 October 2017

Sunrise: 07:46   Sunset: 18:10
Moon phase: New

Perhaps some improvement around mid-day, but mostly very poor to hazardous conditions with severe gales or storm force winds over the summits, coupled with showers or longer periods of locally heavy rain.

Saturday 21 October 2017

Sunrise: 07:48   Sunset: 18:08
Moon phase: New

Similar to Friday with a chance of some improvements, but mostly very poor to hazardous conditions with severe gales over the summits, and showers or longer periods of locally heavy rain.

Sunday 22 October 2017

Sunrise: 07:50   Sunset: 18:06
Moon phase: New

Looking very unsettled at first with storms and periods of locally heavy rain, but improving later.

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