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Brecon Beacons

Weather hazards over 300m on Wed 27 Jul 2016

High risk

Persistent extensive hill fog
Extensive overnight, lifting by day but with higher hills remaining shrouded. Difficult navigation.

Medium risk

Heavy persistent rain
Rain early Wednesday will be heavy and persistent. Slippery rocks and paths likely.
Strong sunlight
Sunny spells later Wednesday will bring moderate UV values. Risk of sunburn unless protected.

Low risk

No low risks
none

No risk

Blizzards
none
Heavy snow
none
Storm force winds
none
Gales
none
Severe chill effect
none
Thunderstorms
none

Wed 27 Jul 2016

Persistent and perhaps heavy rain early in the day will gradually clear during the morning, but remaining rather cloudy. Some further outbreaks of drizzle are possible, with hill fog likely to cover the tops. Warm. sunnier spells are likely by late afternoon, however these should be brief with further drizzly outbreaks possible.

Time
0600 to 0900 0900 to 1200 1200 to 1500 1500 to 1800 1800 to 2100 2100 to 2400
Weather
Light rain Cloudy Cloudy Sunny intervals Cloudy Cloudy
Precipitation probability
60% 30% 20% 10% 10% 10%

Visibility

Very poor early in the morning, with hill fog. Lifting to generally moderate during the day, but staying very poor in hill fog. Poor in any drizzly showers.

Hill Fog

Blanket coverage above 400m during the morning, with ragged patches down to 200m in the west. Lifting to 600m around midday, and becoming broken.

Max wind above 400m

Southwesterly 35mph becoming Westerly 20mph by mid-morning.

Temperature

Valleys:
Plus 16 Celsius becoming Plus 21 Celsius.
800m:
Plus 11 Celsius.
Freezing level:
Above the summits.

Recent Rainfall

Location:
Neuadd Rain (near Pontsticill)
Altitude:
353 m
Rainfall measured at:
0300 on Wed 27 Jul 2016
Last 24 hours:
3.8 mm
Last 48 hours:
4.0 mm
Last 72 hours:
9.6 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.

Thu 28 Jul 2016

Cloudy again overnight, with outbreaks of rain likely by dawn. These are likely to be heavy and persistent at times, with hill fog likely to envelope the tops and some difficult conditions likely. Rain easing by the afternoon, with some warm sunny spells possible. However outbreaks of rain could return overnight.

Visibility

Moderate to poor in rain, and very poor in hill fog. Becoming good to very good in sunny spells later.

Hill Fog

Blanket at 300m by dawn, with ragged patches to 200m, mainly in the west. Slowly lifting to 500m, and becoming broken in the east, but further patches likely down to 300m in heavy rain.

Max wind above 400m

Southwesterly 35mph becoming Westerly 25mph by early evening.

Temperature

Valleys:
Plus 15 Celsius becoming Plus 23 Celsius
800m:
Plus 11 Celsius
Freezing level:
Above the summits.

Fri 29 Jul 2016

A drier day than recently, with just a risk of one or two isolated showers. Some hill fog possible across highest summits, but most tops generally staying clear. Light winds.

Sat 30 Jul 2016

A similar day to Friday, although possibly a few more showers around, leading to some of the highest tops remaining shrouded for lengthy periods. Some sunny spells remain possible, especially later in the day.

Sun 31 Jul 2016

A clearer, and fresher northwesterly flow will lead to some clearer and better conditions across the hills. Although there will remain the risk of one or two showers, there will be some frequent sunshine.

Issued at: 0425 on Wed 27 Jul 2016