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

Friday, 1 August 2014: dawn to dusk

Printable view Forecast issued: 0422 on Friday, 1 August 2014

Overview for Friday

A cloudy day with showery rain, heavy at times.

Hazards Risk Explanation
Blizzards No Risk  
Heavy snow No Risk  
Storm force winds No Risk  
Gales No Risk  
Severe chill effect No Risk  
Persistent and extensive hill fog Medium Extensive at 500m at first, becoming patchy, but as low as 300m at times.
Thunderstorms Low Low risk of an isolated thundery downpour.
Heavy persistent rain Medium Showery rain throughout, possibly reaching totals of 40mm in 24 hours.
Strong Sunlight No Risk  

key to hazards and forecast content

Weather summary and probability of precipitation for Friday
Dawn to 0900 0900 to 1200 1200 to 1500 1500 to dusk
Light rain showers
Light rain showers
Heavy rain showers
Heavy rain showers
Heavy rain showers
Heavy rain showers
Heavy rain showers
Heavy rain showers
70% 80% 70% 70%

Detailed mountain weather forecast: Snowdonia

Friday

Weather

A cloudy day with outbreaks of rain. The rain will become more persistent throughout the morning, particularly on western slopes. Rain will be heavy at times. Cloud bases will be generally 500m, but may drop as low as 300m in heavy rain, lifting and breaking at times through the afternoon. Winds will be fresh southwesterly.

Visibility

Good, but moderate in rain, poor in heavy rain and mist, very poor in hill fog.

Hill fog

Extensive above 500m, possibly as low as 300m at times, lifting and breaking at times this afternoon.

Maximum winds above 500m

Southwest 35 mph.

Temperature

Valleys Plus 12 Celsius increasing plus 18 Celsius.
900 m Plus 9 Celsius.
Freezing level Above the summits.

Saturday

Weather

Rain for much of the day, heavy at times, maybe becoming drier for a short spell during the afternoon before further showery rain pushes through later. Cloud bases will be as low as 200m at times throughout the day, particularly over southern slopes. Winds generally northwesterly moderate, but strengthen later.

Visibility

Good, but moderate in rain, poor in heavy rain and mist, very poor in hill fog.

Hill fog

Patchy at 200m throughout the day.

Maximum winds above 500m

Southwest becoming northwest 45 mph.

Temperature

Valleys Plus 12 Celsius increasing plus 17 Celsius.
900 m Plus 7 Celsius.
Freezing level Above the summits.

Outlook

Sunday

Some showery rain through the morning, then clearing to leave a mainly dry afternoon with sunny spells and isolated showers. Breezy, particularly at height, easing later.

Monday

A generally dry and bright day with some sunny spells. Winds lighter than Sunday. Increasingly cloudy from the west later with some showery rain possible.

Tuesday

Mainly dry at first with some bright or sunny spells. Cloud increasing later with some showers or rain possible.

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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