Cloud base, seen from the hills

Webcam observations for Snowdon and Tryfan. See where cloud meets the slopes, then explore the readings behind the view.

Tryfan from Caseg Fraith Hut — Camera feed timestamp: 16 September 2026, 17:45 BST. These rolling images may have refreshed since the cloud-base reading above.
Camera: University of London Graduate Mountaineering Club (ULGMC), Caseg Fraith Hut. Used with permission.

Latest observation

Above visible tops

16 September 2026, 17:45 BST

Provisional webcam estimate, above sea level. The camera-facing slopes, not the whole mountain.

Useful context for the view now, not a promise that cloud will stay at this height. Compare it with the forecast before heading out.

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From photograph to cloud height

We match the camera view to a LiDAR terrain model, then look for where visible hillside gives way to cloud. Known ground heights turn that contact into an approximate height above sea level.

Clear reference view of Tryfan — **1. Establish the clear view.** 25 August 2026: the visible Tryfan skyline provides a reference for this camera position. A clear mountain does not mean a cloudless sky.

Shaded LiDAR terrain reconstruction from the Caseg Fraith Hut camera viewpoint — **2. Reconstruct the ground.** The fitted camera projects the terrain into the same view. Shading brings out the ridges and slopes; it is illustrative lighting, not observed sunshine. This is a bare-earth model: trees and buildings are not represented.

Cloudy Tryfan webcam example — **3. Read the cloudy scene.** 15 September 2026, 17:00 BST. The image is assessed independently of the weather forecast. Foreground slopes, haze and wisps can make the cloud contact hard to place.

Tryfan cloud analysis overlay for the same cloudy example — **4. Estimate the contact height.** Around 800 m in this example, with low confidence. The overlay marks assessed terrain and candidate cloud contacts; it is not a traced outline of every cloud. 15 September 2026, 17:00 BST.

Selected examples to explain the process, not an accuracy test or current conditions. Photographs are resized for display; analysis overlays are added by Mountain Weather. All heights remain provisional until independently checked.

Height-coloured terrain and camera-visible ground points around Caseg Fraith Hut and Tryfan — **The view from Caseg Fraith Hut.** The camera is east-northeast of Tryfan and looks west-southwest. Coloured points show ground mapped in the camera image, grouped from left to right across the photograph. Background colour follows terrain height. North is up; camera positions are approximate. Open larger map.

With thanks to University of London Graduate Mountaineering Club (ULGMC), Caseg Fraith Hut, photographs used with permission. Terrain: Welsh Government / Natural Resources Wales LiDAR, Open Government Licence v3.0.

Explore a day

All available height readings for Tryfan. Times follow the UK clock; heights are above sea level.

47 readings on 16 September 2026, so far today.

Time	Cloud base	Cloud edge
17:45 BST	Above visible tops	Above visible tops
17:30 BST	Above visible tops	Above visible tops
17:15 BST	Above visible tops	Above visible tops
17:00 BST	Above visible tops	Above visible tops
16:45 BST	Above visible tops	Above visible tops
16:30 BST	Above visible tops	Above visible tops
16:15 BST	Above visible tops	Above visible tops
16:00 BST	Above visible tops	Above visible tops
15:45 BST	Above visible tops	Above visible tops
15:30 BST	Above visible tops	Above visible tops
15:15 BST	Above visible tops	Above visible tops
15:00 BST	Above visible tops	Above visible tops
14:45 BST	Above visible tops	Above visible tops
14:30 BST	Above visible tops	Above visible tops
14:15 BST	Above visible tops	Above visible tops
14:00 BST	Above visible tops	Above visible tops
13:45 BST	Above visible tops	Above visible tops
13:30 BST	Around 800 m	Very diffuse
13:15 BST	Around 850 m	Not assessed
13:00 BST	Around 850 m	Not assessed
12:45 BST	Around 800 m	Sharp
12:30 BST	Around 800 m	Very diffuse
12:15 BST	Around 750 m	Sharp
12:00 BST	Around 800 m	Sharp
11:45 BST	Around 800 m	Sharp
11:30 BST	Not measurable	Not assessed
11:15 BST	Above visible tops	Above visible tops
11:00 BST	Around 800 m	Sharp
10:45 BST	Around 800 m	Sharp
10:30 BST	Around 800 m	Sharp
10:15 BST	Around 800 m	Sharp
10:00 BST	Around 800 m	Very diffuse
09:45 BST	Around 750 m	Sharp
09:30 BST	Around 750 m	Sharp
09:15 BST	Around 700 m	Sharp
09:00 BST	Around 600 m	Soft
08:45 BST	Around 600 m	Soft
08:30 BST	Around 650 m	Very diffuse
08:15 BST	Around 550 m	Very diffuse
08:00 BST	Around 650 m	Sharp
07:45 BST	Around 650 m	Soft
07:30 BST	Around 600 m	Very diffuse
07:15 BST	Around 650 m	Sharp
07:00 BST	Around 650 m	Sharp
06:45 BST	Around 600 m	Soft
06:30 BST	Around 650 m	Very diffuse
06:15 BST	Around 700 m	Sharp

A sharp edge is easier to locate; a soft or diffuse edge is less distinct. Above visible tops means the mapped slopes appear clear, but the camera may not resolve the summit itself. Haze, mist, rain on the lens and changing light can all complicate the view. No estimate means no usable height, not a clear sky. Downloads keep missing values empty and include any available mist and confidence flags. They contain all retained readings for the day, not a guarantee of continuous coverage.

Use these observations

Checking a hill day, comparing a forecast or building a tool for walkers? Download the daily readings as CSV or JSON. Please credit Mountain Weather and the camera provider, link back here, and keep the observation time and quality flags with the height.

Decimal values in a download are model output, not a claim of metre-level accuracy. These are image-derived estimates, not instrument measurements. Camera photographs have their own licences and permissions; a data download does not grant rights to republish them.

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