The Northwest Highlands Forecast
Areas north from Knoydart in the west, and the Great Glen towards the east (NB. Does not include Mull and areas west of Loch Linnhe, these are found in the West Highlands forecast.)
Viewing Weather Forecast for Friday 27th November 2015
Forecast last updated on Thursday 26th November 2015 at 1:05pm
Summary for all mountain areas
Widespread upland gales or near gales either side of an active cold front. The front will bring an abrupt transition from the northwest, after which snow will fall to a few hundred metres. Extensive low cloud. The change will reach S Wales and S Pennines only late in day.
Headline for The Northwest Highlands
Upland gales or near gales. Snow, hail and risk thunder.
How windy? (On the Munros)
Southwesterly 50 gusts 70mph at dawn but soon westerly and 35 or 40mph.
Effect of wind on you?
Walking difficult where exposed on higher areas, particularly at first. Significant wind chill.
Snow and hail showers; lightning.
Rain continuing into daylight, temporarily torrential at about dawn when abruptly changing to snow down to 400m before gradually ceasing over 2 or 3 hours. Then frequent snow and hail showers all day. Possible thunder; whiteout.
Cloud on the hills?
At first, cloud from lower slopes up coastal areas north to Ullapool, but only temporarily below 500m elsewhere. Soon, cloud base quickly changing from 500 to 800m although occasionally 1000m well inland.
Chance of cloud free Munros?
Sunshine and air clarity?
Bursts of sunshine by late morning, mainly well inland. Frequent fog higher areas, and appalling or near zero visibility where also in snow. Intermittently very good lower areas.
How Cold? (at 900m)
5C suddenly dropping to -2C soon after dawn, and then to -3 or -4C by dusk.
Above summits pre dawn; then suddenly 650m, and 450m by dusk.
All mountain areas of Britain from Saturday 28th November 2015
A week to perhaps a fortnight of frequent upland gales and sometimes storm force winds, and particularly on western mountains precipitation at some stage almost daily. Considerable rainfall in total mainly western mountains, particularly per the next 7 days. Freeze-thaw cycles will occur on the Scottish Munros (allowing snow to accumulate on higher areas), whilst further south, higher summits will occasionally be below freezing point, but lying snow fairly transient.