Met Office: Snowdonia: latest weather

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Overview for Monday

Perhaps starting dry in the east but rain soon spreading from the west, with some heavy by midmorning. Hill fog. Rain clearing from the west around midday. Windy with gales, easing somewhat later.

Hazards	Risk	Explanation
Blizzards	No Risk
Heavy snow	No Risk
Storm force winds	Low	A few gusts of around 60 mph likely early in the day.
Gales	High	Southwesterly winds of 40 to 50 mph at first, easing somewhat later.
Severe chill effect	No Risk
Persistent and extensive hill fog	High	Associated with rain during the day.
Thunderstorms	Low	Low risk associated with the heaviest rain during the morning.
Heavy persistent rain	Low	Some heavy rain likely during the morning.

Hazards

Risk

Explanation

Blizzards

No Risk

Heavy snow

No Risk

Storm force winds

Low

A few gusts of around 60 mph likely early in the day.

Gales

High

Southwesterly winds of 40 to 50 mph at first, easing somewhat later.

Severe chill effect

No Risk

Persistent and extensive hill fog

High

Associated with rain during the day.

Thunderstorms

Low

Low risk associated with the heaviest rain during the morning.

Heavy persistent rain

Low

Some heavy rain likely during the morning.

Weather summary and probability of precipitation for Monday
Dawn to 0900	0900 to 1200	1200 to 1500	1500 to dusk
Heavy Rain	Heavy Rain	Sunny intervals	Sunny intervals
80%	90%	40%	60%

Weather summary and probability of precipitation for Monday

Dawn to 0900

0900 to 1200

1200 to 1500

1500 to dusk

Heavy Rain

Sunny intervals

80%

90%

40%

60%

Detailed mountain weather forecast: Snowdonia

Monday
Tuesday
Outlook

Monday

Weather

Perhaps still dry at first, with occasional hill fog, but outbreaks of rain soon spreading from the west, with more general hill fog developing. Some of the rain is likely to be heavy and southwesterly winds will be strong to gale force. Clearer, drier conditions will then follow from the west early in the afternoon, with winds veering more westerly and easing somewhat.

Visibility

Moderate or good, occasionally poor in rain and very poor in fog.

Hill fog

Soon becoming widespread and persistent above 300 to 400 metres, with patches as low as 200 metres in rain. Hill fog generally clearing from the west by early afternoon.

Maximum winds above 500m

Southwest 55 to 60 mph, veering westerly early afternoon and easing to around 30 mph.

Temperature

Valleys	Plus 6, rising to a maximum of Plus 10 Celsius.
900 m	Plus 2 Celsius.
Freezing level	Above summits.

Tuesday

Weather

Dry with variable amounts of cloud and some valley fog patches. Perhaps some brightness at first but cloud becoming widespread by late morning, with rain developing across the area during the afternoon, along with hill fog. Becoming windy.

Visibility

Mostly good, becoming moderate to poor in rain, and very poor in any hill fog.

Hill fog

Hill fog becoming widespread in the south of the area and patchy in the north, mainly above 400 metres but perhaps lowering at times to 200 metres in the south.

Maximum winds above 500m

Southerly or southeasterly 45 mph

Temperature

Valleys	Plus 2 Celsius, rising to plus 8 Celsius.
900 m	Plus 4 Celsius
Freezing level	Above summits.

Outlook

Wednesday

Detail uncertain but probably a cloudy day generally, with rain at times and with occasional hill fog, perhaps becoming extensive and persistent over the higher ground. Southerly winds moderate, perhaps becoming fresh or strong at times.

Thursday

A lot of cloud and some further outbreaks of rain likely but probably less wet than on Wednesday, although still with the risk of extensive and persistent hill fog. There is also a small risk of more widespread and heavier rain, along with increasing winds, spreading to some parts of the area from the south by dusk.

Friday

Staying windy with a risk of gales. Occasional showers or longer outbreaks of rain, some of it heavy. Hill fog at times, especially in the north and west of the area.