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Brecon Beacons mountain area forecast

Forecast issued: 1525 on Monday, 28 July 2014

Overview for Tuesday

Cloudy with some patchy rain through the latter of the afternoon. Becoming drier and brighter later.

Hazards

Medium risk of Persistent extensive hill fog: Cloud as low as 500m on passage of a weak front, bringing patchy rain.

Medium risk of Strong sunlight: Sunny spells through the morning with moderate to high UV levels.

No risk of Blizzards; Heavy snow; Storm force winds; Gales; Severe chill effect; Thunderstorms; Heavy persistent rain;

Weather summary and probability of precipitation for Tuesday

Dawn to 0900 0% chance of precipitation
0900 to 1200 0% chance of precipitation
1200 to 1500 Sunny intervals Sunny intervals 0% chance of precipitation
1500 to dusk Sunny intervals Sunny intervals 0% chance of precipitation

Detailed mountain weather forecast

Tuesday

Weather

Some isolated valley mist patches are possible through the early hours. It will be a generally dry and bright start to the day with some sunny spells. Becoming generally cloudy through the afternoon as a weak weather front approaches from the northwest. The front will bring patchy, mainly light, rain and clod bases as low as 500m at times through the latter part of the afternoon. It will be cooler than of late in a moderate northwesterly breeze.

Visibility

Generally good, moderate in rain, poor in mist and very poor in hill fog.

Hill fog

Cloud bases as low as 500m at times, mainly through the latter part of the afternoon.

Maximum winds above 400m

Northwest 12-17mph.

Temperature

Valleys: Plus 12 Celsius increasing plus 19 Celsius.
800 m: Plus 10 Celsius increasing plus 12 Celsius.
Freezing level: Above the summits.

Wednesday

Weather

A generally day and bright day, but turning cloudy at times. Cloud could be as low as 500m at times and possibly thick enough to produce the odd spot of drizzle on northwestern slopes. Winds reaming mainly moderate westerly. Temperatures about normal for the time of year, but feeling much cooler than of late.

Visibility

Generally good or very good, moderate or poor in drizzle, very poor in hill fog.

Hill fog

Cloud bases as low as 500m at times throughout the day.

Maximum winds above 400m

Westerly 15-20mph.

Temperature

Valleys: Plus 13 Celsius increasing plus 19 Celsius.
800 m: Plus 12 Celsius.
Freezing level: Above the summits.

Outlook

Thursday

A generally dry day with sunny spells and isolated showers. It will feel warm, particularly in the afternoon sun. Winds remaining from the west.

Friday

A generally dry and bright start, but showers will develop through the day, these will be heavy and possibly thundery at times and more frequent than on Thursday. Gusty winds in the showers.

Saturday

Cloudy with patchy rain at first, bringing hill fog mainly to western slopes. Clearing through the morning to become mainly dry with sunny spells, but scattered showers possibly developing through the afternoon.


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