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Brecon Beacons

Weather hazards over 300m on Mon 01 May 2017

High risk

No high risks
none

Medium risk

No medium risks
none

Low risk

Thunderstorms
Low risk of lightning strikes in heavier showers later.
Heavy persistent rain
Heavy showers later may cause poor visibility and slippery surfaces.

No risk

Blizzards
none
Heavy snow
none
Storm force winds
none
Gales
none
Severe chill effect
none
Persistent extensive hill fog
none
Strong sunlight
none

Mon 01 May 2017

A mainly dry start with some bright spells after overnight rain, but occasional showers developing during the day, some becoming heavy and persistent. The odd rumble of thunder cannot be completely ruled out. The showers should ease into the evening, with mainly dry conditions returning and some clear periods.

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 Cloudy Sunny intervals Light shower day Heavy rain Heavy shower day Light shower day Partly cloudy night
Precipitation probability
80% 20% 10% 20% 60% 40% 30% 10%

Visibility

Generally good or very good out of precipitation, but moderate in rain or showers, and poor in any heavy showers or thunderstorms, very poor in hill fog patches.

Hill Fog

Occasional hill fog likely in association with rain or showers, mainly above 500m.

Max wind above 400m

East or northeast 20-25mph.

Temperature

Valleys:
Plus 6 becoming 14 Celsius.
800m:
Plus 1 becoming 4 Celsius.
Freezing level:
Just above summits, rising through the day.

Recent Rainfall

Location:
Neuadd Rain (near Pontsticill)
Altitude:
353 m
Rainfall measured at:
1500 on Sun 30 Apr 2017
Last 24 hours:
0.0 mm
Last 48 hours:
0.0 mm
Last 72 hours:
0.0 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.

Tue 02 May 2017

Mostly dry and windy with sunny intervals after any early patchy low cloud disperses. Cloud increasing through the afternoon with a small chance of a shower late in the day and into the evening.

Visibility

Very good, although very poor in hill fog initially in places. Moderate in any showers.

Hill Fog

Occasional patches above 500m at first.

Max wind above 400m

East 30-35mph at first, easing slightly later.

Temperature

Valleys:
Plus 7 becoming 16 Celsius.
800m:
Plus 4 Celsius.
Freezing level:
Above the summits.

Wed 03 May 2017

Early cloud and hill fog are likely, but soon lifting with warm sunny spells developing. Isolated showers may develop during the day, perhaps heavy at times. However most routes remaining dry. Windy for much of the day with freezing levels above the summits.

Thu 04 May 2017

Another dry and bright start, although some cloud could spill westwards during the day and hill fog is likely to shroud some eastern summits at first. Best of the sunshine in the west. Feeling chilly across exposed routes in the strong northeasterly breeze.

Fri 05 May 2017

Another dry start with hill fog over eastern summits. Bright or sunny spells through the day but the easterly breeze remaining strong keeping the edge off the temperatures.

Issued at: 1537 on Sun 30 Apr 2017