Snowdonia National Park
Includes all summits in the the northern half of Wales from Plynlimon northwards.
Viewing Forecast For
Snowdonia National Park
Thursday 22nd October 2020
Last updated
Wednesday 21st October 2020 at
2:30 PM
Summary for all mountain areas
Despite an approaching ridge of high pressure, the remnants of fronts, will mean only a slow, although sustained improvement after extensive low cloud and patches of rain from dawn - particularly so central Britain. Strong winds will ease; becoming very light in Scotland.
Headline for Snowdonia National Park
Gradually improving as extensive low cloud lifts and pockets of rain clear.
How windy? (On the summits)
Westerly, 30 to 40mph after dawn; easing to around 25 or 30mph by mid afternoon. Strongest winds will be on Snowdon range.
Effect of the wind on you?
Walking arduous on higher areas particularly morning Snowdon range.
How Wet?
Patches of drizzly rain fizzling out
Patches of drizzly rain after dawn mainly or only western mountains, with Snowdon range most at threat will more or less fizzle out by about midday.
Cloud on the hills?
Improving gradually
Fog will shroud the hills from dawn, covering lower slopes west Wales. There will be a sustained improvement as cloud base slowly rises. By mid afternoon, cloud base likely to vary between 750 and 900m west Wales and widely above the summits east.
Chance of cloud free summits?
10% post dawn, 60% by mid afternoon
Sunshine and air clarity?
Patchwork of sunshine gradually coming through as cloud thins and breaks, particularly afternoon. Visibility becoming very good.
How Cold? (at 900m)
2C; will tend to drop during day.
Freezing Level
Above the summits, although by late afternoon close to freezing point above 1000m.
Viewing Forecast For
Snowdonia National Park
Friday 23rd October 2020
Last updated
Wednesday 21st October 2020 at
2:30 PM
How windy? (On the summits)
Southwesterly, 40 to perhaps 45mph at dawn. Dropping to 25mph within 2 or 3 hours, then 30mph afternoon.
Effect of the wind on you?
Walking arduous for periods, mainly post dawn.
How Wet?
Rain, mainly morning
One or two pulses of rain, lasting an hour or two before in afternoon improving to just the odd shower - giving sleet above 850m.
Cloud on the hills?
Extensive morning; cloud base rising
Cloud forming lower slopes west Wales for periods morning, although most cloud above 600m east Wales. Then improving as cloud base rises base 750m to 950m, generally highest east Wales.
Chance of cloud free summits?
30%
Sunshine and air clarity?
Patches of sunshine afternoon, most widely east Wales. Visibility intermittently poor morning, but then mostly good, although slight haze.
How Cold? (at 900m)
Typically 2C; will tend to drop slowly through day.
Freezing Level
Above the summits.
Viewing Forecast For
Snowdonia National Park
Saturday 24th October 2020
Last updated
Wednesday 21st October 2020 at
2:30 PM
How windy? (On the summits)
Southerly typically 70mph, easing toward 45mph during afternoon - perhaps only late on.
Effect of the wind on you?
Any mobility difficult and wind chill severe where exposed on higher areas, sudden gusts at times some lower slopes.
How Wet?
Rain, widely heavy, later clearing
Soon widely constant rain, often heavy western mountains. Likely to clear mid to late afternoon.
Cloud on the hills?
Extensive
Blanket fog most most of day above 200-400m most western slopes, but nearer 450 to 700m north of A5 and across mid-Wales. Will improve only late in day.
Chance of cloud free summits?
10%
Sunshine and air clarity?
Rare if any sunshine. Visibility often poor, particularly in heavy rain.
How Cold? (at 900m)
6C.
Freezing Level
Above the summits.
Planning Outlook
A series of often intense lows will come in off the Atlantic, bringing periods of storm force winds to all mountain areas from the weekend. Rain will fall almost daily, particularly on western mountains, where considerable total rainfall. On higher areas, mainly the Scottish Highlands, snow will fall intermittently.