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Updated: 0306 on Sat 4 Jul 2009
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Snowdonia: latest pressure

Saturday, 4 July 2009: dawn to dusk

Forecast issued: 2216 on Friday, 3 July 2009


Overview for Saturday

Patchy low cloud clearing, then sunshine and showers, some heavy. Breezy.


Key to Hazards
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 No Risk  
Thunderstorms Medium Medium risk of thunder with any heavier showers late morning and afternoon.
Heavy persistent rain No Risk  

Weather summary and probability of precipitation for Saturday
Dawn to 0900
Light rain showers
Light rain showers
0900 to 1200
Light rain showers
Light rain showers
1200 to 1500
Heavy rain showers
Heavy rain showers
1500 to dusk
Light rain showers
Light rain showers
40% 80% 80% 60%

Detailed mountain weather forecast: Snowdonia

Saturday

Weather

Broken low cloud at first, down to 300 metres, mainly across the west of the Park and on west and southwest slopes. However, this will quickly thin and break. Otherwise a day of sunshine and showers, some of these heavy with the risk of thunder. Showers are expected to last into the evening. Strong sunshine between the showers. Windy on higher peaks and ridges.

Visibility

Moderate or poor at first and very poor in hill fog. However, the visibility will improve very good during the morning, only to fall temporarily moderate with the heavier showers.

Hill fog

Broken hill fog at first, mainly across western parts of the Park and especially on western slopes, down to 300 metres. However, this lifting and clearing by mid morning. The further broken hill fog is possible down to 600 metres in and after heavier showers.

Maximum winds above 500m

South or southwesterly 25 to 30mph with gusts 40 to 45mph.

Temperature

Valleys 14 Celsius, increasing to 20 Celsius by afternoon.
900 m 10 Celsius, increasing to 14 Celsius by afternoon.
Freezing level Above the tops.

Sunday

Weather

Any patchy low cloud clearing, then sunny spells. However, showers will again break out. Many of these should be light during the morning and early afternoon, but there is a risk of heavy and perhaps thundery showers developing from mid afternoon onwards. It will be rather windy, especially over higher peaks and ridges.

Visibility

Very poor in hill fog at first, otherwise good or very good, except falling moderate in any heavier showers later.

Hill fog

Well broken hill fog down to 300 metres at first, mainly across the west of the Park, this quickly lifting and breaking. Then further well broken hill fog is possible down to 700 metres in association with heavier showers.

Maximum winds above 500m

Southwesterly 30 to 35mph with gusts 45mph.

Temperature

Valleys 13 Celsius increasing to 20 Celsius by afternoon.
900 m 10 Celsius, increasing to 13 Celsius by afternoon.
Freezing level Above the tops.

Outlook

Monday

Sunshine and showers. Some of the showers are likely to be heavy with a small risk of thunder. Patchy hill fog is possible down to 600 metres during and after heavy showers. Good visibility falling temporarily moderate in heavier showers. Breezy at higher levels.

Tuesday

A windy day with sunshine and showers, some showers heavy with a risk of hail and thunder. Low risk of west or northwesterly gales over higher peaks and ridges. Good visibility falling temporarily moderate in heavier showers.

Wednesday

Sunny spells and scattered, mainly light, showers. Good visibility with cloud bases mainly above the tops. Windy, especially over higher peaks and ridges.

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