It may be only a month from the summer solstice, but forecasters warned today that hillwalkers and climbers should prepare for severe winter conditions tomorrow.
Blizzards are possible over the Scottish mountains and there will be a severe wind-chill, the Met Office said.
Anyone venturing on to the hills north of the border should be prepared with appropriate clothing and equipment.
Storm-force winds are forecast over the Cairngorm plateau with sub-zero temperatures.
Other Highland areas will also have strong winds and the Mountain Weather Information Service said it could feel as cold as –17C on the mountain tops.
Met Office chief forecaster Martin Young said: “Although we are well into May we will see some very difficult conditions on the mountains, especially on Thursday.
“On the tops of the mountains in Scotland we could see winds gusting up to 80mph, giving blizzard conditions in the snow and making things very hazardous.
“Whether it’s a pre-planned expedition or a spur of the moment decision to head off, it is vital to check the mountain forecasts on the Met Office website.”
Bob Kinnaird, principal of Glenmore Lodge, the Scottish National Outdoor Training Centre, said: “Although it’s not that unusual to encounter winter conditions on the Scottish hills at this time of year, this is a very severe forecast for the high tops.
“While this still leaves plenty of options to enjoy the hills, careful consideration should be given to planning and route choice, particularly for those who have little experience of mountaineering in Scottish winter conditions.”
As well as wearing and carrying the right gear for conditions, the Met Office advised hillgoers to check the intended route is appropriate for your ability.
Walkers should also carry a mobile phone but not rely on it and should leave a note of their route with someone.
Both the Met Office and Mountain Weather Information Service sites can be accessed via grough’s links page.