Use my current location crosshair
yellow Warnings have been issued for the United Kingdom

Brecon Beacons

Weather hazards over 300m on Thu 18 Dec 2014

High risk

Storm force winds
Gusts to 90mph will make walking incredibly difficult with a risk of being blown over.
Gales
Gales across most routes will cause considerable buffeting.
Severe chill effect
Wet and windy conditions will make it feel cold despite the temperature being mild for December.
Persistent extensive hill fog
Cloud will consistently lie as low as 500m significantly reducing visibility.

Medium risk

Heavy persistent rain
Rain will fall through the day, persistently across western slopes where it also becomes heavy.

Low risk

No low risks
none

No risk

Blizzards
none
Heavy snow
none
Thunderstorms
none
Strong sunlight
none

Thu 18 Dec 2014

A wet and windy day with gales across most routes, and storm force winds across the more exposed routes, this will make it feel very cold despite the mild December temperatures and will cause considerable buffeting making walking very difficult and dangerous. Rain falling through the day becoming persistent and heavy on western facing slopes making surfaces slippery and rivers swell and become fast flowing.

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
Light rain Light rain Light rain Light rain Light rain Heavy rain Heavy rain Heavy rain
Precipitation probability
80% 90% 100% 100% 100% 100% 100% 100%

Visibility

Generally moderate to poor in rain through the day.

Hill Fog

A blanket cloud will lie above 500m, with broken cloud persistently down to 400m, and isolated patches to 200m possible.

Max wind above 400m

Westerly 55mph with gusts 90mph, decreasing later.

Temperature

Valleys:
Plus 9 Celsius.
800m:
Plus 6 Celsius.
Freezing level:
Above the summits.

Recent Rainfall

Location:
Neuadd Rain (near Pontsticill)
Altitude:
353 m
Rainfall measured at:
1500 on Wed 17 Dec 2014
Last 24 hours:
11.2 mm
Last 48 hours:
11.6 mm
Last 72 hours:
16.2 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: 1635 on Wed 17 Dec 2014

Fri 19 Dec 2014

Very wet with persistent rain at first, but this clears to the southeast through the early hours. It then will be dry, bright, and colder than on Thursday, with west or northwesterly winds, with gales continuing and perhaps storm force winds over the most exposed summits and ridges. Becoming slightly cloudier later, but cloud will remain above the summits.

Visibility

Moderate to poor in rain at first, increasing to become very good, perhaps even excellent by dawn.

Hill Fog

A blanket cloud will lie above 500m, with broken cloud down to 400m at first. This will then become more fractured as cloud lifts above the summits with no hill fog aside from a few patches to 600m.

Max wind above 400m

West or northwesterly 45mph gusts 65-70mph over the highest summits.

Temperature

Valleys:
Plus 9 Celsius falling to plus 5 Celsius.
800m:
Plus 6 Celsius, falling to around zero Celsius.
Freezing level:
Above the summits at first, falling to 800-900m.

Issued at: 1635 on Wed 17 Dec 2014

Sat 20 Dec 2014

Generally dry with some sunny spells through the day. Becoming cloudy later, perhaps with some light rain or drizzle. Freezing level 800-900m rising above the summits.

Issued at: 1635 on Wed 17 Dec 2014

Sun 21 Dec 2014

Cloudy with occasional outbreaks of rain. Northwesterly winds turn westerly. Freezing level above the summits.

Issued at: 1635 on Wed 17 Dec 2014

Mon 22 Dec 2014

Westerly winds increasing and becoming strong. This brings further rain across the parks, likely becoming persistent and perhaps heavy across western facing slopes. Freezing level above the summits.

Issued at: 1635 on Wed 17 Dec 2014