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Updated: 0438 on Sat 4 Jul 2009
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Brecon Beacons: latest pressure

Saturday, 4 July 2009: dawn to dusk

Forecast issued: 2150 on Friday, 3 July 2009


Overview for Saturday

Misty low cloud clearing, then sunshine and showers.


Key to Hazards
Hazards Risk Explanation
Blizzards No Risk  
Heavy snow No Risk  
Storm force winds No Risk  
Gales No Risk  
Severe chill effect No Risk  
Persistent and extensive hill fog Low Areas of hill fog at first, down to 200 metres, but lifting and breaking by mid morning.
Thunderstorms Low Low risk of thunder with any heavier showers late morning and afternoon.
Heavy persistent rain No Risk  

Weather summary and probability of precipitation for Saturday
Dawn to 0900
Light rain showers
Light rain showers
0900 to 1200
Light rain showers
Light rain showers
1200 to 1500
Heavy rain showers
Heavy rain showers
1500 to dusk
Heavy rain showers
Heavy rain showers
10% 60% 60% 30%

Detailed mountain weather forecast: Brecon Beacons

Saturday

Weather

Misty low cloud at first, down to 200 metres. However, this will thin and break during the first half of the morning. Otherwise a day of sunshine and showers. Many of the showers should be light and passing, though a few heavy showers are likely late morning and afternoon with a low risk of thunder. Showers are expected to die out later in the evening. Strong sunshine between the showers. Low to medium risk of sunburn. Rather windy on higher peaks and ridges.

Visibility

Moderate or poor at first, and very poor in hill fog. However the visibility will improve very good during the morning. Then temporarily falling moderate with the heavier showers.

Hill fog

Broken hill fog around and soon after dawn across the south of the park, with well broken hill fog across the north, down to 200 metres. However, this lifting and clearing by mid morning. Further temporary broken hill fog is still possible down to 700 metres in and after heavier showers, but generally the summits will remain clear.

Maximum winds above 400m

South or southwesterly 20 to 25mph with gusts 35 to 40mph.

Temperature

Valleys 14 Celsius, increasing to 21 Celsius by afternoon.
800 m 10 Celsius, increasing to 14 Celsius by afternoon.
Freezing level Above the tops.

Sunday

Weather

Patchy low cloud clearing, then sunny spells. However, showers will again develop. Many of these should be light during the morning and early afternoon, but there is a risk of heavy and perhaps thundery showers spreading eastwards later. It will be rather windy with a low risk of gales over higher peaks and ridges. Low to medium risk of sunburn.

Visibility

Poor or very poor in hill fog at first, otherwise good. Falling moderate in any heavier showers later.

Hill fog

Broken hill fog down to 300 metres at first, mainly across the south of the Park, lifting and breaking early morning. Then ragged hill fog patches is possible down to 700 metres in association with heavier showers later.

Maximum winds above 400m

Southwesterly 25 to 30mph with gusts 45 to 50mph.

Temperature

Valleys 13 Celsius increasing to 20 Celsius by afternoon.
800 m 10 Celsius, increasing to 13 Celsius by afternoon.
Freezing level Above the tops.

Outlook

Monday

A breezy day with sunshine and showers. Some of the showers are likely to be heavy with a small risk of thunder. Patchy hill fog may occur down to 700 metres during and after heavy showers. Good visibility falling temporarily moderate in heavier showers. The westerly wind will strengthen to become moderate to fresh at higher levels through the afternoon and evening.

Tuesday

A windy day with sunshine and showers, some showers heavy with a risk of hail and thunder. Low risk of westerly gales over higher peaks and ridges. Good visibility falling temporarily moderate in heavier showers.

Wednesday

Sunny spells and just one or two passing light showers. Good visibility with cloud bases mainly above the tops. Breezy, especially at highest level, with moderate or fresh northwest winds.

North East England West Midlands Grampian South West England Central, Tayside & Fife Northern Ireland North West England East of England Highlands & Eilean Siar Strathclyde Wales East Midlands SW Scotland, Lothian Borders London & South East England Yorkshire & Humber