Glyder Fawr to the Bannau, Wales
Glyder Fawr was on the edge of a Likely area the night before, and Very likely by morning. The webcam was stuck in cloud, but Morgan and Neil were up above it.
Read the forecast checkLochaber & the Great Glen
Ben Nevis cloud inversion forecast. Next 24 hours.
Next 24 hours
Unlikely
Nothing forming around Ben Nevis right now. We’ll email you when that changes.
Captured 21 Oct, 23:10 BST · model rating, not a literal probability
Local outlook
Ben Nevis over the next 24 hours
Very likely
Likely
Possible
Purple dot: Ben Nevis
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Checked against what happened
Our forecasts, checked
We save each forecast before dawn, then compare it with dated photos of what happened. The nearest check to Ben Nevis so far is Torridon to Tap o’ Noth, about 145 km north-east.
Yr Wyddfa, Wales
By the night before, Yr Wyddfa was Very likely. The summit webcam and a first-hand report both show it above a cloud sea across Eryri.
Read the forecast check
Torridon to Tap o’ Noth, Scotland
The Very likely area over the Highlands held right up to the final update. Walkers at Tap o’ Noth, Torridon and Loch Quoich found cloud below them at dawn.
Read the forecast checkWe’ll publish misses and uncertain calls too, as the record grows.
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When a cloud inversion looks likely near Ben Nevis, WeatherDuck emails you up to 24 hours ahead, so you’ve time to check the route and set an alarm.
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WEATHERDUCK ALERT
Likely cloud inversion
Ben Nevis area
Best window05:00–08:00
Conditions are lining up for a cloud inversion. Check the latest forecast before you set off.
Example email · values are illustrativeLocal inversion guide
When can you see a cloud inversion at Ben Nevis?
The best chance comes when colder, moist air settles on low ground beneath warmer, drier air, winds stay light and the cloud top remains below your viewpoint.
Ben Nevis rises steeply above Glen Nevis and Fort William, close to sea lochs and the Great Glen. Low cloud can pool beneath the mountain while moist Atlantic air brings a deeper layer over the summit.
A high summit does not guarantee a view above cloud. Look for a defined cloud top below the mountain, drier air above it and agreement around Glen Nevis, then check the full summit forecast for wind and cap cloud.
Before you travel: the map shows the wider pattern across Lochaber & the Great Glen, not a promise for one summit. Check the latest wind, visibility and mountain forecast for your exact route.
See the forecast data and limitationsFind the warm, dry lid
Warmer and drier air above colder, moist low ground can cap cloud in the glens. Moisture continuing through the upper profile is a warning for summit cloud.
Compare Glen Nevis and the Great Glen
One local fog bank is weaker evidence than a similar signal around Glen Nevis, Fort William and Spean Bridge. Use the timeline to see whether the pool spreads.
Keep the cloud below 1,345 m
The classic view needs clear air above the cloud top. Ben Nevis can carry separate cap cloud even when lower Lochaber glens are under an inversion.
Check exposed wind as well
Calm glen conditions can help low cloud hold, while the summit remains much windier. Use the full mountain forecast before making any route decision.
Plan beyond tomorrow
See the next two days
The public map stays focused on the next 24 hours. Premium extends the detailed inversion map, atmospheric profile and forecast window to two days.
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Browse other Lochaber & Glencoe locationsQuick answers
Cloud inversion questions for Ben Nevis
Does cloud in Glen Nevis guarantee a Ben Nevis inversion?
No. The cloud must remain below the useful viewing height and clearer air must exist above it. Separate cap cloud can still cover Ben Nevis while the glen is foggy.
Is the likelihood an exact probability for the Ben Nevis summit?
No. It is the regional model signal for Lochaber and the Great Glen, supported by nearby captured forecast points. The summit can experience different cloud and wind.
Does a Likely signal mean Ben Nevis is safe to climb?
No. The outlook only describes cloud-inversion structure. Ben Nevis is a serious mountain; check the complete forecast, route conditions, daylight and official safety advice.
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