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yellow Warnings have been issued for the United Kingdom

Snowdonia

Weather hazards over 300m on Sat 25 Oct 2014

High risk

Gales
Winds will gusts to 60mph at times across the summits and exposed ridges.

Medium risk

No medium risks
none

Low risk

Severe chill effect
Temperatures will feel closer to -2 or -3C across the summits.
Persistent extensive hill fog
Occasional patches above 500m through the day, perhaps extensive across western summits morning.

No risk

Blizzards
none
Heavy snow
none
Storm force winds
none
Thunderstorms
none
Heavy persistent rain
none
Strong sunlight
none

Sat 25 Oct 2014

It will be much drier and brighter day, with variable cloud and sunny spells. There will be some outbreaks of rain or drizzle, although sheltered eastern areas may remain largely dry throughout. The southwesterly wind will remain strong, with gales over the summits and exposed ridges leading to significant buffeting and a marked wind chill.

Time
0600 to 0900 0900 to 1200 1200 to 1500 1500 to 1800 1800 to 2100 2100 to 2400
Weather
Light shower day Light shower day Light shower day Sunny intervals Cloudy Drizzle
Precipitation probability
60% 30% 30% 20% 30% 40%

Visibility

Generally very good, but very poor in the drizzly outbreaks and less than 100 metres where shrouded in the cloud.

Hill Fog

Occasional patches of hill fog above 500m, particularly during showers. However, cloud bases may be rather extensive above 700m through the morning, before breaking up into the afternoon.

Max wind above 500m

Southwesterly 40-50mph, gusting to 60 mph at times.

Temperature

Valleys:
Plus 6 becoming 14 Celsius
800m:
Plus 4 Celsius
Freezing level:
Above the summits.

Ground conditions

Latest: 20/04/2014 15:53

Issued at: 0341 on Sat 25 Oct 2014

Sun 26 Oct 2014

Variable, often large, amounts of cloud through the day. The cloud will be thick enough at times for some outbreaks or rain or drizzle. However the cloud may also break at times to reveal some sunny spells, this will be most likely across more sheltered eastern hills. Despite the mild temperatures it will feel much colder in exposure to the wind, which may reach storm force across the peaks.

Visibility

Generally good, but poor in any drizzly outbreaks and very poor in the hill fog.

Hill Fog

Cloud bases will vary markedly through the day. Periods of hill fog above 500m, especially near the drizzly showers. However, during the morning, the hill fog may be rather extensive across western summits.

Max wind above 500m

Southweserly 40-50mph with gusts 60-70mph.

Temperature

Valleys:
Plus 7 becoming 15 Celsius
800m:
Plus 6 Celsius
Freezing level:
Above the summits.

Issued at: 0341 on Sat 25 Oct 2014

Mon 27 Oct 2014

A similar day on Monday, cloudy with occasional hill fog and a few drizzly outbreaks, but some sunny spells in the east. The hill fog may become extensive later in the day. The winds will remain strong, with severe gales likely across the summits and ridges.

Issued at: 0341 on Sat 25 Oct 2014

Tue 28 Oct 2014

A cloudy and wet day across the park with extensive hill fog and outbreaks of rain. The rain may turn persistent for a time, especially in the west. The strong southwesterly winds will abate through the day.

Issued at: 0341 on Sat 25 Oct 2014

Wed 29 Oct 2014

Cloud, occasional rain and hill fog will persist through the day. Cooler, clearer air may push into the north overnight. Light to moderate easterly winds.

Issued at: 0341 on Sat 25 Oct 2014