Brecon Beacons mountain area forecast

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Sunday, 22 November 2009: dawn to dusk

Forecast issued: 1724 on Saturday, 21 November 2009

Latest pressure

UK latest pressure
Updated: 0052 on Sun 22 Nov 2009

Digital Map Data:
© Collins Bartholomew Ltd (2006)

Overview for Sunday

A brighter day, but very windy with strong to gale-force winds throughout, together with frequent, occasionally heavy showers.

Hazards Risk Explanation
Blizzards No Risk  
Heavy snow No Risk  
Storm force winds High Southwesterly, gusts up to 60 mph, with the risk of 70 mph over 600m.
Gales High Southwesterly, gusts up to 60mph likely, particularly on exposed ridges.
Severe chill effect High In showers and especially above 700m
Persistent and extensive hill fog Low Occasional patches of hill fog, in and around showers above 600m.
Thunderstorms Low Low risk of thunder and lightning in any of the heavier showers.
Heavy persistent rain Low Low risk of heavy showers merging together to form longer periods of rain during the afternoon.

Key to Hazards

Weather summary and probability of precipitation for Sunday
Dawn to 0900 0900 to 1200 1200 to 1500 1500 to dusk
Heavy rain showers
Heavy rain showers
Heavy rain showers
Heavy rain showers
Heavy rain showers
Heavy rain showers
Heavy rain showers
Heavy rain showers
50% 60% 70% 90%

Detailed mountain weather forecast: Brecon Beacons

Sunday

Weather

Brighter but remaining very windy with strong to gale- force winds together with frequent showers, some heavy. Largely cloudy but some brief sunshine can be expected in between the showers.

Visibility

Generally moderate to good, but poor in heavy showers and very poor in any hill fog.

Hill fog

Occasional patches above around 700 metres.

Maximum winds above 400m

Southwest 45 to 55 mph gusting 60-70 mph.

Temperature

Valleys Plus 9 Celsius
800 m Plus 3 Celsius
Freezing level Well above peaks.

Monday

Weather

Another windy day with strong westerly winds. Cloudy with showery rain at first, possibly heavy at times, becoming brighter and drier with more in the way of sunny spells later.

Visibility

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

Hill fog

Occasional patches above 600 metres.

Maximum winds above 400m

Westerly 30 to 40 mph gusting 50 mph.

Temperature

Valleys Plus 8 Celsius
800 m Plus 2 Celsius
Freezing level Well above the summits.

Outlook

Tuesday

Remaining unsettled with more strong to gale-force southwesterly winds, and some spells of persistent, heavy rain. Periods of hill fog are likely.

Wednesday

Very windy with strong to gale-force west or southwesterly winds, and further heavy showers throughout the day. Occasional patches of hill fog.

Thursday

Winds easing but still remaining unsettled with scattered showers and variable amounts of cloud. Occasional hill fog.

Weather warnings have been issued for Wales

Weather forecast for Wales

Enhanced forecast


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