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Updated: 0352 on Fri 19 Mar 2010
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Brecon Beacons: latest pressure

Friday, 19 March 2010: dawn to dusk

Forecast issued: 1704 on Thursday, 18 March 2010

Printable view

Overview for Friday

A cloudy but mostly dry morning, although a bit misty and drizzly in the south. Rain spreading from the southwest during the afternoon.

Hazards Risk Explanation
Blizzards No Risk  
Heavy snow No Risk  
Storm force winds No Risk  
Gales Low Gusts may just reach gale force around peaks and ridges towards the end of the day.
Severe chill effect No Risk  
Persistent and extensive hill fog High Hill fog likely in association with rain and also in southern parts of the park during the morning.
Thunderstorms No Risk  
Heavy persistent rain Medium Rain likely to be fairly persistent towards the end of the afternoon.

Key to Hazards

Weather summary and probability of precipitation for Friday
Dawn to 0900 0900 to 1200 1200 to 1500 1500 to dusk
Cloudy
Cloudy 		Cloudy
Cloudy 		Cloudy
Cloudy 		Heavy Rain
Heavy Rain
30% 20% 40% 80%

Detailed mountain weather forecast: Brecon Beacons

Friday

Weather

A mostly dry but cloudy start to the day in the Brecon Beacons, with a risk of drizzle on some southern slopes. Then staying similar for much of the day, although rain is expected to spread from the southwest during the second half of the afternoon.

Visibility

Generally good during the day, although poor in drizzle and very poor in hill fog. Becoming moderate in rain later.

Hill fog

Periods of hill fog at all levels in the south at first, becoming occasional above 500 metres during the morning. Again, periods above about 200 metres towards the end of the afternoon as rain approaches.

Maximum winds above 400m

South or southwest 25-35 mph, becoming southeast 40-50 mph later.

Temperature

Valleys Plus 10 Celsius.
800 m Plus 5 Celsius.
Freezing level Above the summits.

Saturday

Weather

Another cloudy day with outbreaks of rain both morning and afternoon, along with some drier intervals in between. The rain is unlikely to be constant but could be heavy at times, particularly on south or southwest-facing upslopes.

Visibility

Generally moderate, but occasionally poor in heavier rain and very poor in hill fog.

Hill fog

Periods of hill fog above about 200 metres.

Maximum winds above 400m

Southwesterly 30-35 mph.

Temperature

Valleys Plus 10 Celsius.
800 m Plus 6 Celsius.
Freezing level Above the summits.

Outlook

Sunday

Rain clearing early to leave a mostly dry day, although staying rather cloudy. One or two showers remain likely with brisk southwesterly winds.

Monday

Staying mild and damp, with rain and a good deal of low cloud likely. Moderate southerly winds will turn westerly through the day.

Tuesday

Remaining unsettled and mild, with further rain or showers and moderate westerly 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