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.
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
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 |
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| 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 |
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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.
Issued at:
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