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Brecon Beacons mountain area forecast

Forecast issued: 0445 on Monday, 1 September 2014

Overview for Monday

Cloudy through much of the morning with outbreaks of rain and hill fog. Clearer conditions spreading in later on.

Hazards

High risk of Persistent extensive hill fog: Extensive down to 400 metres through the morning.

Low risk of Strong sunlight: With moderate UV levels there is a risk of sunburn in sunny spells later in the afternoon

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

Weather summary and probability of precipitation for Monday

Dawn to 0900 Cloudy Cloudy 40% chance of precipitation
0900 to 1200 Cloudy Cloudy 20% chance of precipitation
1200 to 1500 Sunny intervals Sunny intervals 10% chance of precipitation
1500 to dusk Sunny intervals Sunny intervals 0% chance of precipitation

Detailed mountain weather forecast

Monday

Weather

It will be cloudy through much of the morning, with outbreaks of rain or drizzle and extensive hill fog. Late in the morning and into the afternoon, conditions will gradually improve from the northwest, with rain easing and cloud lifting, allowing some bright or sunny spells to develop later in the afternoon.

Visibility

Moderate or poor at first in the rain, and very poor in the hill fog, becoming generally good during the afternoon.

Hill fog

Extensive down to 400 metres through the morning, locally down to 200 metres on western facing upslopes through the early hours. Cloud will gradually lift and break through the morning, with isolated patches over the summits through the afternoon.

Maximum winds above 400m

Southwesterly 35mph

Temperature

Valleys: Plus 11 Celsius rising Plus 20 Celsius
800 m: Plus 11 Celsius
Freezing level: Above the summits

Tuesday

Weather

Dry with clear spells overnight. It is likely to remain dry throughout the day, although perhaps rather cloudy at times. The best of any breaks in the cloud and the best of the sunshine is likely to be in the west of the park.

Visibility

Generally very good, but very poor in any hill fog.

Hill fog

Isolated patches over the summits.

Maximum winds above 400m

Northeasterly 15mph

Temperature

Valleys: Plus 9 Celsius rising Plus 21 Celsius
800 m: Plus 10 Celsius
Freezing level: Above the summits.

Outlook

Wednesday

Any early mist or fog patches should quickly clear to leave a dry and fine day with a good deal of sunshine, particularly first thing. During the day, the cloud may well build, however this should stay largely above the summits. Winds are likely to be light and variable.

Thursday

It will be another mainly dry day, with variable amount of cloud and bright or sunny spells developing after any early mist or fog patches lift. Winds will remain light and variable.

Friday

The settled weather looks set to continue initially on Friday, with bright or sunny spells and variable amounts of cloud. Through the day, cloud may thicken from the west, perhaps with some rain later. Winds will be light and variable.


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