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Updated: 1005 on Tue 19 Mar 2013
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Snowdonia: latest infra-red satellite

Wednesday, 20 August 2014: dawn to dusk

Printable view Forecast issued: 1617 on Wednesday, 20 August 2014

Overview for Thursday

Rather cloudy at times, with isolated showers. Hill fog possible during heavier bursts. However some brighter spells likely too, especially in the east.

Hazards Risk Explanation
Blizzards No Risk  
Heavy snow No Risk  
Storm force winds No Risk  
Gales No Risk  
Severe chill effect Low Unseasonable temperatures and moderate breeze will lead to summits feeling close to freezing.
Persistent and extensive hill fog Low Ragged patches of hill fog around 600m, mainly near heavy showers.
Thunderstorms No Risk  
Heavy persistent rain No Risk  
Strong Sunlight Medium Sunny spells between showers will lead to a risk of sunburn

key to hazards and forecast content

Weather summary and probability of precipitation for Thursday
Dawn to 0900 0900 to 1200 1200 to 1500 1500 to dusk
rain
rain
rain
rain
Sunny intervals
Sunny intervals
Cloudy
Cloudy
10% 10% 10% 20%

Detailed mountain weather forecast: Snowdonia

Thursday

Weather

It will be a dry and chilly start to Thursday with clearer spells during the early hours. However cloud will gradually increase from the north and west during the morning bringing an increasing risk of scattered showers. These could bring hill fog at times, especially across western slopes. It will also feel unseasonably cold across the summits, especially in the westerly breeze

Visibility

Generally very good to excellent, but falling to moderate in showers and very poor in hill fog.

Hill fog

Ragged patches at 600m in the west at first, coming and going with the showers. Becoming increasingly extensive during the afternoon. Best chance of cloud free summits across eastern hills.

Maximum winds above 500m

Westerly 40mph

Temperature

Valleys Plus 4 Celsius becoming Plus 17 Celsius
900 m Plus 5 Celsius
Freezing level Above the summits.

Friday

Weather

Cloudy with scattered showers overnight, and patches of hill fog. Drier and brighter intervals are likely to develop during the day, with the best of these during the afternoon. However a few evening showers are possible, and if these occur they could include the odd thundery burst. Remaining cool, and feeling cold across the summits and ridges.

Visibility

Generally very good, but falling to moderate in showers and very poor in hill fog.

Hill fog

Patches at 400m, occasionally to 200m in the west during the morning. However breaking up and lifting during the course of the day, with all summits likely to clear by the early afternoon.

Maximum winds above 500m

Northwesterly 35mph

Temperature

Valleys Plus 8 Celsius becoming Plus 17 Celsius.
900 m Plus 5 Celsius
Freezing level Above the summits.

Outlook

Saturday

A cold start to the day with grass frost likely in the valleys. A largely fine day will then follow with some lengthy sunshine, and just the low risk of one or two isolated showers, mainly at first. Winds will also be light,

Sunday

Another largely dry and often sunny day is likely. It is likely to be less cold, with winds turning southwesterly. However cloud will thicken from the southwest during the afternoon, with rain, hill fog and strengthening winds likely overnight.

Monday

A rather wet and cloudy day with outbreaks of rain, and gales possible over the highest peaks. Rain could turn heavy for a time in the morning, and whilst temperatures will be closer to normal it will be feeling much colder due to the inclement conditions.

Observations

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Weather warnings for Wales

Weather forecast for Wales

The Enhanced Mountain forecast for Snowdonia has been discontinued. All forecast information for these locations can be found in the standard Mountain forecast above.

North East England West Midlands Grampian South West England Central, Tayside & Fife Northern Ireland North West England East of England Highlands & Eilean Siar Strathclyde Wales East Midlands SW Scotland, Lothian Borders London & South East England Yorkshire & Humber

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