Includes all higher summits in the southern half of Wales, including highest point in Preseli Hills.
Brecon Beacons
Friday 14th August 2020
Last updated
Thursday 13th August 2020 at
2:26 PM
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.
Threat heavy rain and thunderstorms forming again, locally varied.
Direction varied, mostly less than 10mph, locally 15-20mph for periods.
Small
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.
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.
30%
Occasional sunshine. Hazy or very hazy; visibility very poor in heavy rain.
17C, small diurnal range; locally a degree or so lower if in fog banks.
Above the summits.
Brecon Beacons
Saturday 15th August 2020
Last updated
Thursday 13th August 2020 at
2:26 PM
Easterly; speeds varied, typically 20mph but locally up to 30mph on higher slopes and in sudden gusts some lower slopes.
Generally small, albeit both higher up and on lower slopes (particularly through passes and cols and west of higher tops).
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.
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.
30%
Little or no sunshine. Hazy and visibility poor in heavy rain.
13C; small variation all day.
Above the summits
Brecon Beacons
Sunday 16th August 2020
Last updated
Thursday 13th August 2020 at
2:26 PM
Southeasterly, 15 to 20mph, but locally may be gusty to 30mph near/west of higher summits.
Fairly small, but local gusty conditions possible, in places to low levels.
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.
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.
40%
Little if any sun. A general haze, and visibility reduced further where rain occurs.
Staying around 13C.
Above the summits.
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.