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Updated: 2252 on Fri 20 Nov 2009
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Snowdonia: latest pressure

Saturday, 21 November 2009: dawn to dusk

Forecast issued: 1656 on Friday, 20 November 2009

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Overview for Saturday

A generally cloudy day with outbreaks of rain becoming heavier and more widespread during the morning along with strengthening winds.

Hazards Risk Explanation
Blizzards No Risk  
Heavy snow No Risk  
Storm force winds Low A risk of gusts to around 70 mph in the afternoon.
Gales High Southerly winds strengthening through the morning. Gusts in excess of 50 mph likely by afternoon.
Severe chill effect No Risk  
Persistent and extensive hill fog High Hill fog is likely to become extensive or blanket above around 500 metres by afternoon.
Thunderstorms No Risk  
Heavy persistent rain High Rain is likely to be heavy and persistent through the afternoon.

Key to Hazards

Weather summary and probability of precipitation for Saturday
Dawn to 0900 0900 to 1200 1200 to 1500 1500 to dusk
Light rain
Light rain
Heavy Rain
Heavy Rain
Heavy Rain
Heavy Rain
Heavy Rain
Heavy Rain
50% 80% 90% 90%

Detailed mountain weather forecast: Snowdonia

Saturday

Weather

A cloudy start with outbreaks of mostly light rain. The rain becoming heavier through the morning to leave a wet afternoon with hill fog becoming extensive. Southerly gales developing over the higher ground.

Visibility

Moderate or poor for much of the day in rain and very poor in hill fog.

Hill fog

Occasional above around 300 metres at first, especially southern upslopes. becoming widespread or blanket above around 500 metres by afternoon.

Maximum winds above 500m

Wind gusting 60 to 70 mph in the afternoon above around 600 metres.

Temperature

Valleys Plus 13 Celsius.
900 m Plus 8 Celsius.
Freezing level Well above the summits.

Sunday

Weather

A very windy day. Bright or sunny spells are likely at times with broken cloud but there will be occasional blustery showers, heavy and perhaps prolonged. Gale or perhaps severe gale force south or southwest winds. Occasional hill fog.

Visibility

Moderate or good but occasionally poor in heavier showers and very poor in hill fog.

Hill fog

Occasional above around 500 metres with patches at 300 metres in heavier showers.

Maximum winds above 500m

Wind gusts 70 to 80 mph possible at times above around 600 metres.

Temperature

Valleys Plus 10 to plus 12 Celsius.
900 m Plus 6 Celsius.
Freezing level Well above the summits.

Outlook

Monday

Unsettled with further showers or perhaps some longer spells of rain. Strong to gale force westerly winds. Occasional hill fog.

Tuesday

Continuing unsettled with further showers or perhaps some longer spells of rain. Strong to gale force westerly winds. Occasional hill fog.

Wednesday

Another unsettled and windy day with occasional blustery showers and occasional hill fog.

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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Read this page in: Cymraeg

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