Met Office: Snowdonia: forecast cloud

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Overview for Saturday

Cloudy with extensive hill fog and spells of often heavy rain. Later this afternoon drier conditions may reach the far northwest of Snowdonia.

Hazards	Risk	Explanation
Blizzards	No Risk
Heavy snow	No Risk
Storm force winds	No Risk
Gales	Low	Winds may gust to 50mph at times over highest ridges and peaks this afternoon.
Severe chill effect	No Risk
Persistent and extensive hill fog	High	Hill fog above 300 metres, lifting above 700 metres through this afternoon across the south.
Thunderstorms	No Risk
Heavy persistent rain	Medium	Risk of heavy and persistent rain this morning.

Hazards

Risk

Explanation

Blizzards

No Risk

Heavy snow

No Risk

Storm force winds

No Risk

Gales

Low

Winds may gust to 50mph at times over highest ridges and peaks this afternoon.

Severe chill effect

No Risk

Persistent and extensive hill fog

High

Hill fog above 300 metres, lifting above 700 metres through this afternoon across the south.

Thunderstorms

No Risk

Heavy persistent rain

Medium

Risk of heavy and persistent rain this morning.

Weather summary and probability of precipitation for Saturday
Dawn to 0900	0900 to 1200	1200 to 1500	1500 to dusk
Heavy Rain	Heavy Rain	Light rain	Light rain
70%	80%	80%	60%

Weather summary and probability of precipitation for Saturday

Dawn to 0900

0900 to 1200

1200 to 1500

1500 to dusk

Heavy Rain

Light rain

70%

80%

60%

Detailed mountain weather forecast: Snowdonia

Saturday
Sunday
Outlook

Saturday

Weather

Overcast with extensive hill fog, and spells of rain and drizzle this morning which are likely to become heavy and persistent at times. This afternoon as the wind becomes northerly so the cloud bases will lift, especially across the south of the Park. Late afternoon dry conditions may arrive across the far northwest of Snowdonia.

Visibility

Moderate or good, occasionally poor with rain and drizzle, and very poor with hill fog.

Hill fog

Extensive hill fog above 300 metres will persist throughout this morning. This afternoon it will lift to around 400 metres, and probably above 700 metres across the more sheltered south of the Park.

Maximum winds above 500m

Southwesterly 20-25 mph becoming northerly 30-35 mph gusting 45-50 mph this afternoon.

Temperature

Valleys	Plus 10 Celsius.
900 m	Plus 6 Celsius at first, falling to plus 2 Celsius in the afternoon.
Freezing level	Above summits.

Sunday

Weather

Dry throughout. Starting with a few fog patches in the valleys, but these will clear by mid morning as patches of hill fog also disperse. Then fine and bright through the rest of the day with cloud above the summits.

Visibility

Good or very good, after starting locally very poor with low level fog and also hill fog.

Hill fog

Occasional patches around 200 metres at first, mainly across the west of the Park, clearing by mid morning. Then nil.

Maximum winds above 500m

Westerly 10-15 mph becoming southwesterly 30-40mph with gusts to 50 mph.

Temperature

Valleys	Plus 5 Celsius increasing to plus 7 Celsius.
900 m	Plus 2 Celsius
Freezing level	Above summits.

Outlook

Monday

Remaining unsettled with strong winds gusting to around gale force at times. Rain is likely to be heavy and persistent and there is likely to be extensive hill fog. The freezing level may just touch the summits at some point during the day.

Tuesday

A respite from the unsettled weather likely on Tuesday, with clear and dry conditions expected. It will be rather windy at first with a risk of gale force gusts around the summits, but should become calmer during the day. The freezing level should remain around the summits.

Wednesday

A return to the wet and windy weather on Wednesday, with occasional rain spreading from the west, possibly becoming heavier and more persistent by the end of the day. It will become windy too with gales likely around the summits.