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Brecon Beacons

Weather hazards over 300m on Sat 30 May 2015

High risk

No high risks
none

Medium risk

Heavy persistent rain
Heavy rain expected this evening and overnight.

Low risk

Persistent extensive hill fog
Broken hill fog spreading from the west into the evening.
Strong sunlight
Periods of strong sunshine possible during the morning.

No risk

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

Sat 30 May 2015

Mainly dry overnight with clear spells, and just a slight chance of a shower. Saturday morning will then be fine and dry with a light breeze, and plenty of sunshine. Cloud will spread from the west during the afternoon along with a freshening wind, before outbreaks of rain and hill fog arrive during the evening.

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
Clear night Clear night Sunny day Sunny day Sunny intervals Cloudy Heavy rain Heavy rain
Precipitation probability
30% 20% 0% 0% 0% 30% 80% 80%

Visibility

Generally good. Falling to moderate or poor later in rain and very poor in hill fog.

Hill Fog

Broken above 500 metres spreading from the west later as rain arrives.

Max wind above 400m

Northwesterly 15-20mph, gradually backing and strengthening southwesterly 30-40mph by evening.

Temperature

Valleys:
Plus 4 Celsius rising to plus 14 Celsius.
800m:
Plus 4 Celsius rising to plus 9 Celsius.
Freezing level:
Above the highest summits.

Recent Rainfall

Location:
Neuadd Rain (near Pontsticill)
Altitude:
353 m
Rainfall measured at:
1500 on Fri 29 May 2015
Last 24 hours:
3.2 mm
Last 48 hours:
3.6 mm
Last 72 hours:
3.6 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: 1705 on Fri 29 May 2015

Sun 31 May 2015

A wet and windy night with hill fog and persistent rain, though rain should begin to become light and patchy towards dawn, becoming dry soon after sunrise. Sunday should then be a dry and breezy day, rather cloudy during the morning but with some sunny spells developing during the afternoon and evening.

Visibility

Moderate to poor in overnight rain, then becoming mainly good or very good.

Hill Fog

Broken above 500 metres overnight, but lifting and breaking during Sunday morning as rain clears away.

Max wind above 400m

Southwesterly 30-40mph overnight, turning west or northwesterly 30mph as morning rain clears.

Temperature

Valleys:
Plus 7 Celsius becoming plus 13 Celsius.
800m:
Plus 9 Celsius becoming plus 4 Celsius.
Freezing level:
Above the highest summits.

Issued at: 1705 on Fri 29 May 2015

Mon 01 Jun 2015

A dry bright and breezy start to the day, but with scattered showers developing through the afternoon ahead of wet and windy weather spreading from the west during the evening, with a risk of gales over the summits.

Issued at: 1705 on Fri 29 May 2015

Tue 02 Jun 2015

A blustery day with strong gusty winds and heavy showers through the day, with a risk of thunderstorms at times, particularly during the afternoon.

Issued at: 1705 on Fri 29 May 2015

Wed 03 Jun 2015

A return to fine dry and settled conditions, with light winds and some good sunny spells, though not particularly warm for the time of year. A marked contrast to Monday and Tuesday.

Issued at: 1705 on Fri 29 May 2015