Met Office: Snowdonia: forecast wind

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Overview for Thursday

Starting dry, bright and mild. Rain will spread from the west during the afternoon, becoming persistent and heavy at times later.

Hazards	Risk	Explanation
Blizzards	No Risk
Heavy snow	No Risk
Storm force winds	No Risk
Gales	High	Gusts to gale force are likely around peaks and ridges later in the day.
Severe chill effect	No Risk
Persistent and extensive hill fog	High	Hill fog likely down to quite low levels later in the afternoon.
Thunderstorms	No Risk
Heavy persistent rain	High	Heavy and persistent rain expected during the afternoon, particularly on southwest-facing slopes.

Hazards

Risk

Explanation

Blizzards

No Risk

Heavy snow

No Risk

Storm force winds

No Risk

Gales

High

Gusts to gale force are likely around peaks and ridges later in the day.

Severe chill effect

No Risk

Persistent and extensive hill fog

High

Hill fog likely down to quite low levels later in the afternoon.

Thunderstorms

No Risk

Heavy persistent rain

High

Heavy and persistent rain expected during the afternoon, particularly on southwest-facing slopes.

Weather summary and probability of precipitation for Thursday
Dawn to 0900	0900 to 1200	1200 to 1500	1500 to dusk
Sunny intervals	Cloudy	Light rain	Heavy Rain
0%	0%	60%	>90%

Weather summary and probability of precipitation for Thursday

Dawn to 0900

0900 to 1200

1200 to 1500

1500 to dusk

Sunny intervals

Cloudy

Light rain

Heavy Rain

60%

>90%

Detailed mountain weather forecast: Snowdonia

Thursday
Friday
Outlook

Thursday

Weather

Thursday is expected to dawn dry and bright in Snowdonia, though with upper cloud limiting the amount of sunshine. The cloud will thicken and lower through the day to bring outbreaks of rain by early afternoon. Once it starts, rain is expected to continue fairly persistently for the rest of the day, becoming heavy at times on southwest-facing upslopes.

Visibility

Good at first, but becoming moderate or poor, occasionally very poor, in rain later.

Hill fog

Nil in the morning, gradually increasing and lowering during the afternoon to become broken above about 200-400 metres by evening.

Maximum winds above 500m

Southwesterly 50-60 mph, with gusts to 70 mph.

Temperature

Valleys	Plus 10 Celsius.
900 m	Plus 6 Celsius.
Freezing level	Above the summits.

Friday

Weather

Friday should be mostly dry in Snowdonia with some sunny intervals, although there is a low risk of a little light rain or drizzle towards evening. It is likely to start quite misty in places, however, with low cloud initially taking a while to lift, but then becoming much brighter later.

Visibility

Poor or very poor in places at first, but becoming good during the afternoon.

Hill fog

Patchy below 500 metres at first, gradually dispersing through the morning. Nil later.

Maximum winds above 500m

Southwesterly 25-30 mph.

Temperature

Valleys	Plus 8 Celsius.
900 m	Plus 3 Celsius.
Freezing level	Above the summits.

Outlook

Saturday

A cloudy day with rain or showers, possibly heavy for a time in the morning, though these should generally ease through the afternoon. Moderate southerly winds and freezing levels staying well above the summits.

Sunday

Sunday should be mostly dry but cloudy with occasional outbreaks of mainly light rain. Moderate southwesterly winds.

Monday

Remaining unsettled and generally cloudy with showers at times through the day, some of them likely to be quite heavy. Southwesterly winds still, but becoming much stronger through the day.