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Updated: 0602 on Sun 20 Apr 2014
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Zoom map SW Scotland, Lothian Borders North West England North East England Yorkshire & Humber Wales East Midlands West Midlands East of England London & South East England South West England Northern Ireland Central, Tayside & Fife Grampian Highlands & Eilean Siar Orkney & Shetland Strathclyde

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Snowdonia: forecast cloud

Sunday, 20 April 2014: dawn to dusk

Printable view Forecast issued: 1704 on Sunday, 20 April 2014

Overview for Monday

Dry through the early hours with mist and low cloud developing by dawn. Cloud breaking during the morning to give sunny spells, then heavy showers developing later in the afternoon.

Hazards Risk Explanation
Blizzards No Risk  
Heavy snow No Risk  
Storm force winds No Risk  
Gales Low Southeasterly gales are just possible over the peaks.
Severe chill effect No Risk  
Persistent and extensive hill fog Medium Periods above around 400 metres at first, then occasional patches around the peaks.
Thunderstorms Low Showers late afternoon may turn thundery.
Heavy persistent rain No Risk  
Strong Sunlight Low Low risk of sun burn before showers develop.

key to hazards and forecast content

Weather summary and probability of precipitation for Monday
Dawn to 0900 0900 to 1200 1200 to 1500 1500 to dusk
Light rain
Light rain
Cloudy
Cloudy
Sunny intervals
Sunny intervals
Sunny intervals
Sunny intervals
60% 0% 0% 0%

Detailed mountain weather forecast: Snowdonia

Monday

Weather

It will be dry through the early hours with mist and low cloud developing by dawn. Cloud will lift and break during the morning to give warm sunny spells and a low risk of sun burn. Heavy showers are expected to develop later in the afternoon, which may turn heavy and thundery, but they should ease and become less frequent in the evening.

Visibility

Mostly good or very good, but moderate or poor in showers and very poor in hill fog.

Hill fog

Periods above around 400 metres at first, then occasional patches around the peaks, perhaps down to 700 metres with showers.

Maximum winds above 500m

Easterly 50 mph.

Temperature

Valleys Plus 6 rising to 16 Celsius.
900 m Plus 8 Celsius.
Freezing level Above the summits.

Tuesday

Weather

It is likely to be fairly cloudy with further showery outbreaks of rain for most of the day. Some showers may be heavy but they should become fewer and further between by late afternoon. Winds will be lighter.

Visibility

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

Hill fog

Periods to persistent above around 400-500 metres.

Maximum winds above 500m

Southeasterly 30 mph.

Temperature

Valleys Plus 7 rising to 12 Celsius.
900 m Plus 4 Celsius.
Freezing level Above the summits.

Outlook

Wednesday

A band of persistent rain and hill fog is expected to spread eastwards across the park, with clearer, more showery weather following in the afternoon. The freezing level will be above the summits, with a brisk southwesterly wind.

Thursday

Bright or sunny spells and showers are likely for much of the day, with occasional hill fog and a southerly breeze. Some showers may turn heavy. The freezing level will stay above the summits.

Friday

Another day of sunshine and showers is expected with light easterly winds. Occasional hill fog is likely around the peaks. The freezing level will stay above the summits.

There is no recent report of the ground conditions available from the National Park wardens.

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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