High for much milder conditions than of late but becoming medium in details especially regarding timing of rain around the middle of the week.
Dry with clear spells and strong northwesterly winds.
Wind significantly lowers the ‘feels-like’ temperature relative to the actual temperature, with even moderate winds significantly adding to the chilling effect. Strong winds can result in a severe and debilitating wind chill many degrees below the actual temperature. This effect will be enhanced in rain or wet snow. Without protection, prolonged exposure could result in frost nip or frostbite on exposed parts of the body and/or hypothermia.
Poor visibility presents challenging route finding conditions. Visibility could be significantly less than 50 metres in all directions with few or no visual references, especially on featureless moors or plateaux. Distances become hard to judge and cliff or cornice edges can be difficult to recognise. These conditions require good navigational skills. There is a risk of white-out conditions when mist or fog is combined with extensive snow cover.
Dry with sunny spells. Strong winds at first and again later
|Chance of precipitation|
|900m||NW 22 27||NW 18 23||NW 12 15||W 7 9||SW 8 10||SW 10 12||SW 12 15||SW 13 16|
|600m||NW 12 17||NW 10 13||SW 7 9||S 6 8||SW 6 9||S 10 12||S 12 16||S 14 18|
|300m||NW 6 14||NW 4 11||S 3 5||SE 3 5||S 3 6||S 4 8||S 6 12||S 7 15|
|Valley||NW 6 14||NW 5 12||S 3 5||S 3 5||S 3 7||S 5 8||S 7 12||S 8 15|
Dry with some long clear or sunny spells. Low level fog in eastern valley's will be slow to clear perhaps lingering through the day in some spots.. A thaw of lying snow and frozen ground is likely to develop at all levels.
Around 75% with occasional of cloud above about 750m. Chances fall during the evening as cloud begins to increase.
Very good or excellent with some good panoramic views of surrounding hills and mountains. However visibility may be a few hundred metres or less in valley fog.
Strong winds and near zero temperatures on the summits produce a significant chill effect, especially through the early hours. Where fog persist in the valley's temperatures will struggle to make much more than 2 or 3 Celsius.
Area - Snowdon Date - 16 December 2017 Time - 11.45am Snow Above - 500m Report By - Warden Yr Wyddfa Route Taken PyG Track Conditions Heavy frost cover on rocks and vegitation. Depth of snow increases with altitude. Paths difficult to follow. There is a steep bank of snow below the Fingerstone Kit Advice The following is a list of additional kit required based on the current conditions. Ice axe and crampons essential. Wear crampon compatible boots. Ski goggles for strong winds and blowing snow. Take waterproofs, hat, gloves and spare warm layers.
A generally cloudy day with outbreaks of mainly light rain or drizzle. Best of any brighter spells expected across the more sheltered eastern hills.
Southerly or southwesterly winds around 20mph with gusts around 35mph over ridges and summits
Little chance for many hills with periods or persistent cloud above about 450m, with patches below, but rising to around 30% over eastern hills as cloud becomes occasional above 600m at times
Good falling to just a few kilometres in rain and drizzle.