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Brecon Beacons

Weather hazards over 300m on Mon 01 Sep 2014

High risk

Persistent extensive hill fog
Extensive down to 400 metres through the morning.

Medium risk

No medium risks
none

Low risk

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

No risk

Blizzards
none
Heavy snow
none
Storm force winds
none
Gales
none
Severe chill effect
none
Thunderstorms
none
Heavy persistent rain
none

Mon 01 Sep 2014

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.

Time
0600 to 0900 0900 to 1200 1200 to 1500 1500 to 1800 1800 to 2100 2100 to 2400
Weather
Cloudy Cloudy Sunny intervals Sunny intervals Sunny intervals Partly cloudy night
Precipitation probability
40% 20% 10% 0% 20% 0%

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.

Max wind above 400m

Southwesterly 35mph

Temperature

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

Recent Rainfall

Location:
Neuadd Rain (near Pontsticill)
Altitude:
353 m
Rainfall measured at:
0300 on Mon 01 Sep 2014
Last 24 hours:
0.4 mm
Last 48 hours:
0.4 mm
Last 72 hours:
14.0 mm

Rainfall data provided by the Environment Agency. The Met Office is not responsible for content provided by third parties and may remove this data without warning.

Issued at: 0445 on Mon 01 Sep 2014

Tue 02 Sep 2014

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.

Max wind above 400m

Northeasterly 15mph

Temperature

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

Issued at: 0445 on Mon 01 Sep 2014

Wed 03 Sep 2014

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.

Issued at: 0445 on Mon 01 Sep 2014

Thu 04 Sep 2014

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.

Issued at: 0445 on Mon 01 Sep 2014

Fri 05 Sep 2014

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.

Issued at: 0445 on Mon 01 Sep 2014