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Not available Not available 0100 on Tue 7 Sep 2010 1300 on Tue 7 Sep 2010 0100 on Wed 8 Sep 2010 1300 on Wed 8 Sep 2010 0100 on Thu 9 Sep 2010 1300 on Thu 9 Sep 2010 1300 on Fri 10 Sep 2010
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Updated: 0813 on Mon 6 Sep 2010
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Snowdonia: forecast pressure

Monday, 6 September 2010: dawn to dusk

Printable view Forecast issued: 0944 on Monday, 6 September 2010

Overview for Monday

Mostly dry at first, but persistent heavy rain spreading from the southwest from mid-morning. Strong southeast winds.

Hazards Risk Explanation
Blizzards No Risk  
Heavy snow No Risk  
Storm force winds Low Low risk that winds may just reach 70mph over exposed ridges.
Gales High Risk of southeasterly winds reaching in excess of 50mph.
Severe chill effect No Risk  
Persistent and extensive hill fog Medium Patches over the peaks, then persistent hill fog above around 200 metres in the afternoon.
Thunderstorms Medium Medium risk of thunder locally in heavy rainfall.
Heavy persistent rain High Persistent, heavy rain spreading across the park from early afternoon.
Strong Sunlight Low Some sunny spells in the morning.

Key to Hazards

Weather summary and probability of precipitation for Monday
Dawn to 0900 0900 to 1200 1200 to 1500 1500 to dusk
Sunny intervals
Sunny intervals 		Light rain
Light rain 		Heavy Rain
Heavy Rain 		Heavy Rain
Heavy Rain
10% 60% 70% 70%

Detailed mountain weather forecast: Snowdonia

Monday

Weather

Largely dry at first with some bright spells, but cloud and rain will spread from the southwest by mid-morning. Some rain will be heavy and very locally thundery. Winds will be strong throughout and reach gale force at times over ridges, perhaps even just reaching storm force at times.

Visibility

Moderate or good in the morning, falling to very poor in the afternoon, locally less than 200 metres in fog.

Hill fog

Patches around the peaks in the morning, becoming persistent above around 200 metres in the afternoon associated with rainfall.

Maximum winds above 500m

Southeasterly 50-60mph over exposed peaks and ridges, perhaps gusts just reaching 70mph at times.

Temperature

Valleys Plus 17 Celsius.
900 m Plus 13 Celsius.
Freezing level Well above the summits.

Tuesday

Weather

A much drier day with some spells of sunshine but also a few sharp showers, locally thundery. Winds should have eased significantly and visibility should be much better.

Visibility

Moderate or good.

Hill fog

Occasional hill fog around 500 - 600 metres in the morning, lifting above the peaks by midday and only temporarily lowering in association with showers.

Maximum winds above 500m

Southerly 15-20mph.

Temperature

Valleys Plus 17 Celsius.
900 m Plus 10 Celsius.
Freezing level Above the summits.

Outlook

Wednesday

A similar day to Tuesday, with a mixture of scattered heavy, locally thundery showers, and bright or sunny spells. Visibility should be moderate or good and winds will remain light and southerly. No significant hill fog is expected, but any heavy showers may cause some temporary hill fog and poorer visibility.

Thursday

Another unsettled day with sunshine and showers. Although showers may be as heavy, they should be less widespread, giving way to longer drier and brighter spells. Winds will be light and west or southwesterly.

Friday

Dry at first with some sunshine, but becoming cloudier after midday with the possibility of some persistent rain in the afternoon. Winds should be light and southwesterly at first, but strengthen in the afternoon. No significant hill fog is expected at first, but it may develop with any rain in the afternoon.

Observations

     Capel Curig

Webcams

     Snowdon webcam
     Llyn Tegid webcam

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Weather warnings have been issued 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