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Brecon Beacons

Confidence

Generally high. Lower confidence for the extent of any cloud breaks on Monday afternoon.

  • Monday
  • Tuesday
  • Further outlook

Monday 19 February 2018

Weather hazards

Poor visibility High 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.

Headline

Patchy rain and extensive low cloud and hill fog. Drier and perhaps brighter in the east at times in the afternoon.

Weather at 600m

06:00 09:00 12:00 15:00 18:00 21:00
Fog Fog Fog Fog Fog Fog
70% 70% 50% 30% 30% 20%
Chance of precipitation
2,100 2,200 2,200 1,800 1,600 1,500
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

06:00 09:00 12:00 15:00 18:00 21:00
600m NW 12 17 NW 14 18 NW 16 20 NW 17 22 NW 16 21 NW 17 22
300m W 5 12 NW 6 13 NW 7 15 NW 7 15 NW 6 14 NW 7 14
Valley W 5 12 NW 6 13 NW 7 16 NW 7 15 NW 6 14 NW 6 14

Temperature (°C) By altitude above mean sea level

06:00 09:00 12:00 15:00 18:00 21:00
600m 7 6 6 7 6 5
300m 7 8 8 9 8 7
Valley 8 8 9 10 8 8

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

06:00 09:00 12:00 15:00 18:00 21:00
600m 3 3 2 2 2 1
300m 6 6 6 7 6 5
Valley 6 7 7 8 7 6
Sunrise: 07:21   Sunset: 17:35
Moon phase: Waxing crescent

Weather

Low cloud with occasional rain or drizzle during the morning. Mostly dry in the afternoon and evening with fleeting bright or clear spells, mainly across eastern side of the National Park.

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

Nil through the morning with extensive cloud from low slopes upwards. 40% in afternoon and evening with cloud slowly lifting to about 600m with many summits in the east becoming clear at times.

Visibility

Often poor through the morning with mist fog and occasional drizzle. Becoming good in the afternoon below the cloud base.

Meteorologist's view

Northwesterly winds will occasionally reach 25mph on the high ridges and summits.

Recent rainfall

  • Location: Neuadd (Near Pontsticill)
  • Altitude: 353m
  • Measurement date: 03:00 on Mon 19 Feb 2018
  • Last 24 hours: 3mm
  • Last 48 hours: 4.8mm
  • Last 72 hours: 5mm

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.

Tuesday 20 February 2018

Sunrise: 07:19   Sunset: 17:37
Moon phase: Waxing crescent

Weather

Light rain for a time overnight then a dry and bright day with long spells of sunshine breaking though. Feeling cold on the summits in the strong northerly winds.

Maximum wind speed expected

NW 20mph veering North 25mph gusts 40mph.

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

20% overnight becoming 90% through the morning as cloud soon breaks and lifts off the summits.

Temperature

  • At 600m Plus 5 falling to Plus 2 Celsius.
  • Valley Plus 7 or 8 Celsius.
  • Freezing level Just above the summits.

Visibility

Misty early morning but becoming excellent through the morning.

Wednesday 21 February 2018

Sunrise: 07:17   Sunset: 17:39
Moon phase: Waxing crescent

A dry day with sunny spells and well broken cloud above the summits. Winds turning easterly and becoming light. Feeling colder with freezing level at 800m.

Thursday 22 February 2018

Sunrise: 07:15   Sunset: 17:40
Moon phase: First quarter

Dry with sunny spells, cloud above the summits, and light easterly winds. Freezing level lowering to 400m.

Friday 23 February 2018

Sunrise: 07:13   Sunset: 17:42
Moon phase: First quarter

Dry and bright conditions are expected and feeling cold with fresh easterly winds.

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