MOUNTAIN WEATHER INFORMATION SERVICE www.mwis.org.uk West Highlands

Western Highlands accessible from, and south of, Glenfinnan (Road to the Isles) and Glen Spean (includes ). This area include and the mountains around Glencoe. In the east, includes south to Loch Lomond and NP. Includes Arran and Mull.

Lochaber Guides, Fort William Summer and Winter Climbing, Walking and Mountaineering in the West Highlands of

General Summary for Saturday, 26 September, 2020

British Mountain Summary: Based on forecast chart for noon 26 September, 2020 Cold northerly winds will continue; strongest more eastern mountains. The air will be very clear, most summits cloud free and dry, although on Cairngorms and Deeside cloud will frequently shroud higher areas. Also patches range.

Headline for West Highlands Blustery toward east. Cold, some terrain frozen morning. Bright sunshine. Detailed Forecast for Saturday, 26 September, 2020

How windy? (On the Northerly, 20 to 25mph after dawn; will tend to drop from west. ) By mid afternoon to 10 to 15mph - the lightest winds in ranges near west coast; strongest central highlands & east of Loch Lomond. Effect of wind on Fairly small you?

How wet? Precipitation not expected (Precipitation and its impact)

Cloud on the hills? Little if any

Chance of cloud Almost certain free Munros?

Sunshine? Extensive or unbroken bright sunshine. Air clarity (below Superb visibility. cloud)

How Cold? (at 900m) 0-2C post dawn; rising to 6C in afternoon, although a degree or so lower west of Loch Linnhe.

Freezing Level 900m, rising to above the summits by early afternoon. From valleys up areas of frozen or partly frozen ground morning.

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West Highlands - Looking Ahead

Sunday 27 September Monday 28 September

How windy? (On the Direction varied 10mph or less before in Southwest veering westerly; mostly 30mph. Munros) afternoon becoming southerly; by dusk But chiefly morning Lochaber and west of may reach 20mph Mull. Loch Linnhe, 40mph. Effect of wind on Negligible. Walking often arduous on higher areas, you? particularly in morning. Significant wind chill.

How wet? No precipitation until sunset Rain on and off (Precipitation and its Risk rain reaching coastal hills from about A mix of intermittent rain, and particularly impact) dusk. later afternoon, risk of abrupt frequent heavy showers with hail and small risk thunder. By dusk, risk snow highest summits.

Cloud on the hills? Little if any Very extensive

Isolated ribbons of fog in and above valleys Some summits central highlands and north up post dawn. of Glen Spean may be cloud free for a few hours from dawn. Otherwise, typical cloud base 300 to 600m near the coast and 450 to occasionally 900m well inland.

Chance of cloud 90% 10% free Munros? Sunshine? Sunshine, mostly unbroken, although likely Sunshine, if any, only rarely. Air clarity (below to weaken as high level cloud gradually Varied visibility; intermittently very good or cloud) comes in. excellent, but poor in rain. Superb visibility after fog here and there after dawn. How Cold? (at Varied: 0 to 4C at dawn; typically 8C 5C 900m) mid-afternoon.

Freezing Level Above the summits, but post dawn near or Above the summits. below freezing point, particularly glens and corries with ground in some areas frozen. Planning Outlook All mountain areas of Britain from Sunday, 27 September, 2020 Low pressure will dominate next week, bringing areas of rain to all areas. The centre of gravity of the low is likely to move toward southern Britain later in the week, when least rain (relative to average) is likely to be over northern and perhaps western Scotland (although still the risk of some heavy rain particularly around Wednesday). Temperatures will be a little higher - freezing level only rarely below the highest Scottish summits.

Forecast issued at 15:38 on Friday, 25 September, 2020 The production of the Scottish forecasts is fully funded by the Scottish Government through Mountaineering Scotland with the support of sportscotland. Forecasts are issued daily by 16:30 and are kept under review and amended as necessary. However, expected conditions can still change after issue. © Copyright Mountain Weather Information Service, 2020.

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