Met Office: Brecon Beacons: forecast cloud

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Overview for Monday

Starting dry but rain soon spreading from the west, with some heavy bursts by late morning. Hill fog. Rain clearing from the west by midafternoon. Windy, with gales, easing somewhat later.

Hazards	Risk	Explanation
Blizzards	No Risk
Heavy snow	No Risk
Storm force winds	Low	A few gusts of around 60 mph likely.
Gales	High	Southwesterly winds of 40 to 50 mph at first, easing somewhat later.
Severe chill effect	No Risk
Persistent and extensive hill fog	High	Associated with rain during the day.
Thunderstorms	Low	Low risk associated with the rain during the day.
Heavy persistent rain	Low	Some heavy rain likely late morning and early afternoon.

Hazards

Risk

Explanation

Blizzards

No Risk

Heavy snow

No Risk

Storm force winds

Low

A few gusts of around 60 mph likely.

Gales

High

Southwesterly winds of 40 to 50 mph at first, easing somewhat later.

Severe chill effect

No Risk

Persistent and extensive hill fog

High

Associated with rain during the day.

Thunderstorms

Low

Low risk associated with the rain during the day.

Heavy persistent rain

Low

Some heavy rain likely late morning and early afternoon.

Weather summary and probability of precipitation for Monday
Dawn to 0900	0900 to 1200	1200 to 1500	1500 to dusk
Light rain	Heavy Rain	Heavy Rain	Sunny intervals
60%	90%	90%	10%

Weather summary and probability of precipitation for Monday

Dawn to 0900

0900 to 1200

1200 to 1500

1500 to dusk

Light rain

Heavy Rain

Sunny intervals

60%

90%

10%

Detailed mountain weather forecast: Brecon Beacons

Monday
Tuesday
Outlook

Monday

Weather

Dry at first, with occasional hill fog, but outbreaks of rain will soon spread from the west, with more general hill fog developing. Some of the rain is likely to be heavy and southwesterly winds will be strong to gale force. Clearer, drier conditions will then follow from the west by around the middle of the afternoon, with winds veering more westerly and easing somewhat.

Visibility

Moderate or good, occasionally poor in rain and very poor in fog.

Hill fog

Patches above 300 metres at first. Becoming persistent above 300 to 400 metres through the morning, with patches below this level in rain. Clearing from the west later in the day.

Maximum winds above 400m

Southwest 55 to 60 mph, veering westerly early afternoon and easing to around 30 mph.

Temperature

Valleys	Plus 6, rising to a maximum of Plus 10 Celsius.
800 m	Plus 4, rising to Plus 8 Celsius.
Freezing level	Well above the Peaks.

Tuesday

Weather

Dry with variable amounts of cloud and some valley fog patches. Perhaps some brightness at first but cloud becoming widespread by late morning, with rain developing across the area, along with hill fog. Becoming windy.

Visibility

Mostly good, becoming moderate to poor in rain, and very poor in any hill fog.

Hill fog

Hill fog becoming widespread in the south of the area and patchy in the north, mainly above 400 metres but perhaps lowering at times to 200 metres in the south.

Maximum winds above 400m

Southerly or southeasterly 45 mph

Temperature

Valleys	Plus 2 Celsius, rising to plus 8 Celsius.
800 m	Plus 4 Celsius
Freezing level	Well above the peaks

Outlook

Wednesday

Detail uncertain but probably a cloudy day generally, with rain at times and with occasional hill fog, perhaps becoming extensive and persistent over the higher ground. Southerly winds moderate, perhaps becoming fresh or strong at times.

Thursday

A lot of cloud and some further outbreaks of rain likely but probably less wet than on Wednesday, although still with the risk of extensive and persistent hill fog. There is also a risk of more widespread and heavier rain, with increasing winds, spreading across from the south towards dusk.

Friday

Staying windy with a risk of gales. Occasional showers or longer outbreaks of rain, some of it heavy. Hill fog at times, especially in the south and west of the area.