Brecon Beacons

Includes all higher summits in the southern half of Wales, including highest point in Preseli Hills.

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Viewing Forecast For

Brecon Beacons
Friday 14th August 2020
Last updated Thursday 13th August 2020 at 2:26 PM

Summary for all mountain areas

Many mountains dry; warm sunshine in the west. Low risk of isolated thundery showers forming. Greater threat of thunderstorms mid & south Wales. Fog persists in eastern Scotland and England from low levels upward; just some highest tops above this layer.

Headline for Brecon Beacons

Threat heavy rain and thunderstorms forming again, locally varied.

How windy? (On the summits)

Direction varied, mostly less than 10mph, locally 15-20mph for periods.

Effect of the wind on you?

Small

How Wet?

Thundery downpours

Thunderstorms and areas of rain will drift about slowly, some overnight remnants around dawn, bringing a mix of pockets of light rain, but also patches of heavy or torrential rain. Further thunderstorms forming and moving in from the east during the daytime. Expect considerable variation in rainfall over a few miles.

Cloud on the hills?

Summits clearing intermittently

Ribbons of fog from some valleys up after dawn, extensive some higher areas. Nevertheless, some summits cloud free (in places above the fog). Will vary during the day as rain comes and goes, at times cloud filling in from lower slopes up, but particularly W Wales, sometimes clearing.

Chance of cloud free summits?

30%

Sunshine and air clarity?

Occasional sunshine. Hazy or very hazy; visibility very poor in heavy rain.

How Cold? (at 750m)

17C, small diurnal range; locally a degree or so lower if in fog banks.

Freezing Level

Above the summits.

Viewing Forecast For

Brecon Beacons
Saturday 15th August 2020
Last updated Thursday 13th August 2020 at 2:26 PM

How windy? (On the summits)

Easterly; speeds varied, typically 20mph but locally up to 30mph on higher slopes and in sudden gusts some lower slopes.

Effect of the wind on you?

Generally small, albeit both higher up and on lower slopes (particularly through passes and cols and west of higher tops).

How Wet?

Areas of rain, some thundery

A mix of areas of constant rain over a few hours and heavy briefer bursts with threat thunderstorms. Some areas very wet underfoot.

Cloud on the hills?

Summits intermittently clearing

Confidence in detail low: broadly areas of fog from lower slopes up at first and in some areas in and after rain. However, particularly in west Wales, higher summits may clear for periods.

Chance of cloud free summits?

30%

Sunshine and air clarity?

Little or no sunshine. Hazy and visibility poor in heavy rain.

How Cold? (at 750m)

13C; small variation all day.

Freezing Level

Above the summits

Viewing Forecast For

Brecon Beacons
Sunday 16th August 2020
Last updated Thursday 13th August 2020 at 2:26 PM

How windy? (On the summits)

Southeasterly, 15 to 20mph, but locally may be gusty to 30mph near/west of higher summits.

Effect of the wind on you?

Fairly small, but local gusty conditions possible, in places to low levels.

How Wet?

Risk bursts of rain

Detail uncertain: Some areas may escape often dry, but a risk of bursts of rain drifting slowly across Wales through the day, risk thundery.

Cloud on the hills?

Risk persistent eastern hills

Low cloud may well shroud many hills through the day, particularly where rain occurs. Lowest cloud focused toward east Wales, whilst further west may break up periodically.

Chance of cloud free summits?

40%

Sunshine and air clarity?

Little if any sun. A general haze, and visibility reduced further where rain occurs.

How Cold? (at 750m)

Staying around 13C.

Freezing Level

Above the summits.

Planning Outlook

Remaining warm and humid through the weekend, particularly in western regions, whilst eastern areas are cooler under North Sea air, which brings a risk of lingering fog banks. The Scottish Highlands stay extensively dry. Thundery rain mostly confined to Wales, although rain may expand back northwards into the Pennines by Sunday. Into next week, light winds and areas of slow-moving showers at first, then a gradual change is likely as windier conditions move in from the Atlantic, with belts of rain or showers.