High for generally warm weather, but medium to low for the extent of the lower cloud affecting the eastern ranges throughout and for the detail of the showers.
Harmful UV levels from sunlight increase with altitude giving a greater risk of sunburn and eye damage, even on some overcast days. On breezy days, the cooling effect of wind on exposed skin may disguise any feeling of sunburn until it is too late. If there is snow cover, glare increases the effect of UV rays especially on the eyes. It is advisable to wear sun block, protective clothing such as a long-sleeved top and hat and have good quality eye protection.
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.
Lightning is a significant mountain hazard which can result in serious injury or death. Mountain terrain often leaves one highly exposed to lightning strikes. Hail may give unpleasant conditions with torrential rain and localised flash flooding also possible, mainly in Summer months.
Early mist and low cloud soon clear, with warm sunshine developing. This may trigger some heavy, locally thundery showers during the afternoon.
|Chance of precipitation|
|900m||N 4 5||NE 4 6||E 8 11||N 10 13||NE 13 16||E 18 22|
|600m||SE 2 3||N 5 8||NW 8 12||NW 7 11||NE 8 11||E 10 14|
|300m||NE 1 3||N 5 7||N 7 10||NW 6 9||NE 4 8||E 6 11|
|Valley||NE 1 3||NW 5 7||N 7 11||NW 7 11||N 3 8||E 5 10|
It will be a misty start in places, with some low cloud. This will soon clear to allow warm spells of sunshine to develop. Many ranges will stay dry through the day, however some scattered afternoon showers are likely to develop. These will be locally heavy, and bring a chance of isolated slow moving thunderstorms. These will ease through the evening, then low cloud and mist will once again return to eastern ranges overnight.
80-90% with bases lowering 700-850m in showers.
Poor, perhaps very poor at first and again during the evening across eastern ranges. Otherwise good or very good, becoming moderate or poor in showers.
Strong afternoon sunshine bringing a risk of sunburn.
No recent ground conditions report available. For archived reports see - http://www.snowdonia.gov.wales/visiting/walking/ground-conditions
Early low cloud will be slow to clear, especially across eastern ranges. The best of the brightness will be in the west, with plenty of sunny spells developing. Most ranges will remain dry, with only the odd light shower possible during the afternoon, especially in the east.
East 15mph with gusts 25mph across exposed ridges and summits
90% and 70% for the west and east respectively.
Poor, perhaps very poor at first and again during the evening across far eastern ranges. Otherwise good or very good, becoming moderate in any showers.