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yellow Warnings have been issued for the United Kingdom

Brecon Beacons

Weather hazards over 300m on Fri 24 Feb 2017

High risk

No high risks
none

Medium risk

No medium risks
none

Low risk

Gales
Winds strengthening after dark, leading to a low risk of gales across summits.
Severe chill effect
Despite fine conditions, remaining cold at height with brisk winds.
Persistent extensive hill fog
Cloud thickening into the evening and descending on slopes.

No risk

Blizzards
none
Heavy snow
none
Storm force winds
none
Thunderstorms
none
Heavy persistent rain
none
Strong sunlight
none

Fri 24 Feb 2017

A cold start with frozen ground at height. A sunny day follows, with generally fine conditions, but a noticeable wind chill with brisk northwesterly winds. Perhaps the odd wintry shower at first. However cloud will thicken into the evening, with some hill fog developing across the tops. Freezing levels will rise during the afternoon, to be above the summits after dark. The odd spot of rain developing by midnight.

Time
0600 to 0900 0900 to 1200 1200 to 1500 1500 to 1800 1800 to 2100 2100 to 2400
Weather
Sunny intervals Sunny intervals Sunny intervals Cloudy Sleet Heavy rain
Precipitation probability
10% 10% 0% 20% 80% 100%

Visibility

Very good to excellent during the day. Decreasing to moderate into the evening and very poor in hill fog.

Hill Fog

Well broken above 800 metres becoming broken to overcast at 600 metres during the evening.

Max wind above 400m

Northwesterly 20mph gusting 25-30mph, becoming southwesterly 35mph with gusts 45-50mph after dusk.

Temperature

Valleys:
Zero becoming plus 9Celsius
800m:
Minus 2 becoming plus 2 Celsius
Freezing level:
600m rising to 800m by dusk, and above the summits by midnight.

Recent Rainfall

Location:
Neuadd Rain (near Pontsticill)
Altitude:
353 m
Rainfall measured at:
0300 on Fri 24 Feb 2017
Last 24 hours:
8.2 mm
Last 48 hours:
13.6 mm
Last 72 hours:
20.0 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.

Sat 25 Feb 2017

Turning wet by dawn with persistent hill fog, rain and drizzle through much of the day. Hill fog is likely to shroud western hills to lower levels, where rain is likely to turn heavy at times. There will also be very strong southwesterly winds, so despite the milder temperatures there is likely to be a cold feel. Some clearer spells could move into the area after dark.

Visibility

Moderate to poor in heavy rain with extensive hill fog. Becoming good during the evening.

Hill Fog

Overcast above 600 metres with broken patches down to 400 metres especially in the west.

Max wind above 400m

Southwesterly 45-50mph with gusts around 60-70mph. These easing during the evening to westerly 25mph with gusts 30-35mph.

Temperature

Valleys:
Plus 6 becoming 10 Celsius
800m:
Plus 1 Celsius becoming Plus 4 Celsius.
Freezing level:
Above summits.

Sun 26 Feb 2017

Overnight rain will clear, with freezing levels falling briefly, perhaps leading to some icy patches at first across the tops. Another windy day then follows with southwesterly winds strengthening as a band of heavy rain crosses the area through the afternoon. The freezing levels remaining just above the highest summits, before falling again after dark.

Mon 27 Feb 2017

A cloudy day with scattered heavy showers, falling as snow above 500m. These could align into more persistent bands, leading to some significant accumulations in places. Between showers, some fine conditions are likely, but there will also be the risk of rapid deteriorations as further showers move through. The freezing level will be around 600m, whilst strong winds will lead to an additional hazard.

Tue 28 Feb 2017

Winds will ease overnight with showers fading for a time. A day of sunny spells will then follow, with brisk northerly winds developing. However further showers are then likely through the afternoon, falling as snow above 700m. Freezing levels will gradually rise to around 800m,

Issued at: 0336 on Fri 24 Feb 2017