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Brecon Beacons mountain area forecast

Forecast issued: 1712 on Thursday, 24 April 2014

Overview for Friday

A cloudy, dull day in eastern parts of the park. Further west there will be more cloud breaks and sunny spells. Showers developing in the afternoon may be heavy and thundery at times. Strong wind and rain arriving by midnight.

Hazards

Medium risk of Persistent extensive hill fog: Patchy hill fog during the day in eastern parts. Becoming widespread through the evening.

Low risk of Gales: Winds will strengthen on Friday night, low risk gale force by midnight.

Low risk of Thunderstorms: Showers through the afternoon may be heavy and thundery.

No risk of Blizzards; Heavy snow; Storm force winds; Severe chill effect; Heavy persistent rain; Strong sunlight;

Weather summary and probability of precipitation for Friday

Dawn to 0900 0% chance of precipitation
0900 to 1200 Cloudy Cloudy 0% chance of precipitation
1200 to 1500 Cloudy Cloudy 10% chance of precipitation
1500 to dusk Light rain showers Light rain showers 60% chance of precipitation

Detailed mountain weather forecast

Friday

Weather

A cloudy, dull day in eastern parts of the park. Further west there will be more cloud breaks and sunny spells. Showers developing in the afternoon may be heavy and thundery at times. Strong wind and rain arriving by midnight.

Visibility

Generally good or moderate. Poor in any showers or rain. Very poor in thunderstorms and hill fog.

Hill fog

Patches down to 400 metres through the day will be more extensive in eastern parts of the park, and thinner in the west. From dusk this will become widespread and thick.

Maximum winds above 400m

Northeasterly 20 mph through day time, becoming southerly 40mph through the evening, then 50mph by midnight. Small risk 60mph.

Temperature

Valleys: Plus 8 rising to 14 Celsius.
800 m: Plus 6 Celsius
Freezing level: Well above the summits.

Saturday

Weather

A windy day, with a good chance of gales along the peaks. Bands of rain will pass through during the day, with some drier sunnier interludes inbetween.

Visibility

Generally good, moderate in any rain or showers, very poor in heavy showers and hill fog.

Hill fog

Hill fog down to 400 metres in any rain and showers.

Maximum winds above 400m

60mph. southerly at first, becoming southeasterly through the day.

Temperature

Valleys: Plus 8 rising to 14 Celsius
800 m: Plus 4 Celsius
Freezing level: Above the summits.

Outlook

Sunday

Remaining unsettled, but less rain than on Saturday, and winds less strong. Sunny spells inbetween showers. Hill fog above 500 metres expected in showers.

Monday

Mainly dry with moderate winds. Small chance of some showers. Extensive hill fog to 200 metres, rising above the summits by lunch time.

Tuesday

Scattered showers and sunny spells. Extensive hill fog to 200 metres, rising above the summits by lunch time.


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