High for wintry picture for Thursday and Friday, generally fair conditions Saturday, then periods of snow and rain Sunday, but medium for the detail.
A band of occasionally heavy snow spreading from the west early to mid evening, turning to rain at all levels before midnight.
Walking will be very strenuous with any mobility virtually impossible over exposed ground. There is a high likelihood of being blown over or taken off one’s feet, while even standing up may be impossible at times. Basic tasks such as using a map, eating, putting on extra clothing or communication become extremely difficult away from any shelter.
Progress will be impeded by very strong winds. Walking will be difficult and strenuous at times with a potential for one to be blown over in gusts. There can be a marked increase in winds through cols or on exposed ridges and summits. Distances often take longer to cover with compass bearings becoming more difficult to follow accurately.
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.
Blizzards and whiteouts present challenging and serious conditions due to a combination of falling or blowing snow, strong winds and cold temperatures. They can be highly disorientating, often resulting in near-zero visibility with limited or no visual references and no distinction between ground and sky. Cliff edges and cornices may not be apparent, even close up. These conditions require very good navigational skills.
Expect snow to rapidly accumulate with deep drifts also possible during windy conditions. Progress will be time consuming and physically strenuous, which will significantly affect the distance one is able to travel on foot. Paths will become hidden and difficult to follow, while very poor visibility during snowfall will make route-finding challenging. A heightened avalanche risk is likely and avalanche reports should be consulted where available.
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.
Hazardous conditions overnight with storm force winds over the summits bringing severe chill effect. Also wintry showers and difficulty underfoot conditions by day.
|Chance of precipitation|
|600m||W 53 73||NW 37 49||NW 32 43||W 31 41||W 33 43||W 35 46||W 35 46||W 35 47|
|300m||W 24 45||NW 23 37||NW 20 32||W 20 32||W 20 33||W 21 34||W 21 34||W 21 34|
|Valley||W 18 42||NW 18 35||NW 15 29||W 15 28||W 16 30||W 17 31||W 16 30||W 16 31|
Broad band of rain across the area at first, breaking up to a more showery flow around dawn. Showers through the day, frequent through the morning, then tending to ease from mid-afternoon and through the evening. Outbreaks mostly snow but occasionally sleet and rain below 200m. Showers easing a touch during the evening.
10% or less at first with extensive bases from 300m, becoming 60% from early morning as the cloud bases break and lift, while occasionally lowering to 500m as showers come and go.
In showers and also initial periods of snow and rain poor or very poor and bringing hazardous navigational conditions, otherwise good or very good.
Mean winds speeds at Valley and 300m levels look to light but gusts seem more realistic.
Not much change through the day with the run of frequent wintry showers persisting.
West to southwest mean 35-45mph with gusts reaching 60mph over more exposed ridges and summits.
70% with clouds lowering around 500m as showers pass through.
Good or very good, falling poor or very poor in showers.