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Brecon Beacons mountain area forecast

Forecast issued: 0431 on Saturday, 19 April 2014

Overview for Saturday

Cold and clear with a frost and perhaps some patchy mist first thing. Plenty of sunshine through the day, but turning cloudier later.

Hazards

Medium risk of Strong sunlight: Plenty of sunshine, especially during the morning.

No risk of Blizzards; Heavy snow; Storm force winds; Gales; Severe chill effect; Persistent extensive hill fog; Thunderstorms; Heavy persistent rain;

Weather summary and probability of precipitation for Saturday

Dawn to 0900 Sunny Sunny 0% chance of precipitation
0900 to 1200 Sunny intervals Sunny intervals 0% chance of precipitation
1200 to 1500 Sunny intervals Sunny intervals 0% chance of precipitation
1500 to dusk Sunny intervals Sunny intervals 0% chance of precipitation

Detailed mountain weather forecast

Saturday

Weather

A cold start with a frost and temperatures locally below freezing. Any early mist patches should quickly clear to leave a largely sunny morning with temperatures soon recovering. There may be some patchy cloud on eastern slopes however. During the afternoon it will turn cloudier but still with some good sunny spells, especially in the west. Feeling pleasant in the sunshine while walking, but chilly in the breeze.

Visibility

Very good, but poor in any mist or patchy hill fog.

Hill fog

Well broken at around 500m at first, mainly on eastern slopes, soon dispersing and lifting above the summits.

Maximum winds above 400m

East or northeasterly 15-20mph, becoming 20-30mph by evening.

Temperature

Valleys: Plus 1 Celsius rising to plus 13 Celsius.
800 m: Zero rising to plus 5 Celsius.
Freezing level: Around 800m rising above the summits.

Sunday

Weather

A dry start, but clouding over through the early hours will hill fog developing and becoming quite extensive through the morning. There remains a large amount of uncertainty at this stage, but outbreaks of rain will most likely spread from the southeast during the afternoon, perhaps becoming persistent later. Strong northeasterly winds developing with gales possible over the summits.

Visibility

Good, becoming moderate or poor in rain, very poor in hill fog.

Hill fog

Becoming broken at around 500m through the early hours then extensive during the afternoon with occasional patches above 200m.

Maximum winds above 400m

Northeasterly 40-50mph.

Temperature

Valleys: Plus 2 Celsius rising to plus 12 Celsius.
800 m: Plus 3 Celsius rising to plus 5 Celsius.
Freezing level: Above the summits.

Outlook

Monday

Some brighter spells, but overall rather cloudy with showers which may be heavy and thundery at times, perhaps merging into a longer spell of rain at times. Feeling cool in moderate to strong northeasterly winds and where rain persists. Extensive hill fog likely, particularly in any persistent rain.

Tuesday

Lighter winds than recent days leading to some fog patches in the valleys at first as well as over hills. Some bright spells, but there will still be heavy showers.

Wednesday

Some drier brighter spells initially after any early fog clears, but then another unsettled spell of weather with outbreaks of rain spreading northeastwards across the park. Perhaps drier later in the day. Temperatures around normal but breezier than Tuesday.


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