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Brecon Beacons mountain area forecast

Forecast issued: 0210 on Saturday, 26 July 2014

Overview for Saturday

Largely dry with plenty of sunshine but this turning increasingly hazy. Isolated sharp showers possible later.

Hazards

High risk of Strong sunlight: Lengthy spells of sunshine combined with high UV levels.

Low risk of Thunderstorms: Isolated heavy, thundery showers possible later in the day.

No risk of Blizzards; Heavy snow; Storm force winds; Gales; Severe chill effect; Persistent extensive hill fog; 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 20% chance of precipitation

Detailed mountain weather forecast

Saturday

Weather

A few mist patches possible at first, then it will be a bright and sunny morning. However, cloud will steadily increase from the west making the sunshine more hazy for the afternoon. There is also the risk of few showers developing, these are more likely towards evening with a risk of these turning heavy and thundery.

Visibility

Generally very good, but moderate or poor in any early mist patches. Showers may reduce visibility locally to moderate or poor. Very poor in hill fog.

Hill fog

Generally nil, but cloud may occasionally shroud the highest peaks in any heavy showers. Some patchy hill fog may affect western slopes above around 600m towards midnight.

Maximum winds above 400m

Westerly 15-20 mph.

Temperature

Valleys: Plus 14 Celsius rising to plus 26 Celsius.
800 m: Plus 16 Celsius.
Freezing level: Above the summits.

Sunday

Weather

A cooler day with more cloud than recently, but there will still be some sunny spells, especially through the morning. During the afternoon there will be an increasing chance of showery outbreaks of rain spreading from the northwest, but the peaks may stay mostly dry until evening. Breezy northwesterlies.

Visibility

Good or very good, becoming moderate in showery rain later. Very poor in hill fog.

Hill fog

Occasional patches around 600m at first, then becoming nil but cloud likely lowering again as rain arrives later.

Maximum winds above 400m

Northwesterly 25-30 mph.

Temperature

Valleys: Plus 13 Celsius rising to plus 22 Celsius.
800 m: Plus 11 Celsius.
Freezing level: Above the summits.

Outlook

Monday

Rather cloudy with some showery outbreaks of rain initially bringing periods of hill fog, tending to become brighter towards midday but still with some showers, perhaps heavy. Brisk north or northeasterly winds with temperatures around average.

Tuesday

It should be a mostly dry day with more in the way of sunshine compared to Monday. There could be a few showers towards evening. Breezy with winds from the northwest, but feeling a little warmer than Monday.

Wednesday

A largely fine day with variable amounts of cloud and sunny spells. Light northwesterly winds.


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