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yellow Warnings have been issued for the United Kingdom

Brecon Beacons

Weather hazards over 300m on Wed 28 Sep 2016

High risk

Persistent extensive hill fog
Nil at first, but slopes above 400m shrouded from mid-afternoon onwards.

Medium risk

No medium risks
none

Low risk

Gales
Risk of buffeting with gales possible across highest routes.
Heavy persistent rain
Persistent rain from late afternoon onwards. Although mostly light, waterproof layers recommended

No risk

Blizzards
none
Heavy snow
none
Storm force winds
none
Severe chill effect
none
Thunderstorms
none
Strong sunlight
none

Wed 28 Sep 2016

A breezy overnight period with clear spells, followed by a largely fine morning. There will be some sunny spells, however cloud will soon thicken form the west. Conditions will then deteriorate during the afternoon, with hill fog and rain spreading to all slopes by the evening. Winds will also strengthen, with gales possible across the very highest routes.

Time
0000 to 0300 0300 to 0600 0600 to 0900 0900 to 1200 1200 to 1500 1500 to 1800 1800 to 2100 2100 to 2400
Weather
Partly cloudy night Partly cloudy night Sunny intervals Cloudy Cloudy Cloudy Light rain Light rain
Precipitation probability
10% 10% 10% 20% 20% 30% 60% 80%

Visibility

Good to Moderate, but turning poor in rain and very poor in hill fog.

Hill Fog

Nil at first, but becoming patchy at 600m during the morning. This descending and thickening to 400m by mid-afternoon.

Max wind above 400m

Southwesterly 30 gusts 35-40mph, increasing to southwesterly 40 gust 45-55mph by dusk.

Temperature

Valleys:
Plus 14 Celsius. becoming Plus 17 Celsius.
800m:
Plus 8 Celsius becoming Plus 11 Celsius
Freezing level:
Above the summits

Recent Rainfall

Location:
Neuadd Rain (near Pontsticill)
Altitude:
353 m
Rainfall measured at:
1500 on Tue 27 Sep 2016
Last 24 hours:
3.4 mm
Last 48 hours:
26.2 mm
Last 72 hours:
48.4 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.

Thu 29 Sep 2016

Overnight hill fog and rain will clear around dawn, with clearing skies and summits. Winds will also ease slightly, although staying relatively strong across the summits. By the afternoon, sunny spells are likely to become increasingly prolonged and widespread, although a few showers could move across the park.

Visibility

Moderate overnight, increasing to very good, perhaps excellent by midday. Falling to moderate to poor in any heavy showers.

Hill Fog

Overnight hill fog above 400m clearing around dawn. Then very isolated patches possible above 800m, with any heavy showers.

Max wind above 400m

Southwesterly 40 gust 45-55mph becoming Westerly 25-30 gusts 35-40mph by midday.

Temperature

Valleys:
Plus 14 becoming Plus 18 Celsius.
800m:
11 Celsius becoming 8 Celsius by midday.
Freezing level:
Above the summits

Fri 30 Sep 2016

A day of sunshine, and blustery showers is expected. These could be heavy at times, with conditions on summit tops likely to change rapidly at these shower move through. Away from the showers, there will be plenty of sunshine, although the fresh westerly breeze will lead to a chilly feel across the exposed summits.

Sat 01 Oct 2016

Heavy, thundery downpours are possible during Saturday, perhaps organising into a period of longer rain. Winds will remain strong, and gusty, especially during the showery bursts, before easing away during the evening.

Sun 02 Oct 2016

A drier day, with lighter winds is expected. IT will start chilly, with some valley mist and fog possible, but this should lift and clear to allow some fine conditions across the tops.

Issued at: 1609 on Tue 27 Sep 2016