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Snowdonia

Weather hazards over 300m on Wed 26 Nov 2014

High risk

No high risks
none

Medium risk

Persistent extensive hill fog
Extensive and persistent above 400 metres for much of the day, especially across eastern hills.

Low risk

Severe chill effect
Feeling more like minus 6 or 7 Celsius across the peaks during the early hours.

No risk

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

Wed 26 Nov 2014

A rather cloudy, damp and cold day across the park with outbreaks of patchy rain or drizzle, especially first thing, when some transient snow is also possible above 800 metres. Extensive low cloud will lead to persistent hill fog, especially across eastern and northern parts. Later in the day, drier and perhaps clearer conditions will start to spread in from the west.

Time
0600 to 0900 0900 to 1200 1200 to 1500 1500 to 1800 1800 to 2100 2100 to 2400
Weather
Fog Fog Cloudy Cloudy Cloudy Partly cloudy night
Precipitation probability
30-50% 30-50% 30-50% 10-30% 10% 10%

Visibility

Generally moderate to poor for much of the day, and very poor in hill fog.

Hill Fog

Broken to blanket cloud giving extensive and persistent hill fog above 400 metres, with occasional patches down to 300 metres, mainly in the east and north. Cloud may become more well broken across some western parts later in the day, especially in the evening.

Max wind above 500m

Easterly 15mph at first.

Temperature

Valleys:
Plus 2, becoming plus 5 Celsius.
800m:
Zero Celsius, becoming plus 3 Celsius.
Freezing level:
900 metres, lifting to above the summits in the morning.

Ground conditions

23/11/14 14:00: Wear sturdy walking boots, Take waterproofs, hat, gloves and spare warm layers.

Issued at: 0314 on Wed 26 Nov 2014

Thu 27 Nov 2014

Cloudy and grey with extensive hill fog and perhaps some patchy drizzle over the summits. Best of any breaks in the cloud will be across western hills. Southeasterly winds will increase later in the day.

Visibility

Generally moderate to poor across the park, but very poor in hills shrouded by cloud.

Hill Fog

Broken to blanket cloud giving quite extensive and persistent hill fog above 300 metres, with patches down to 200 metres at times, more especially in the east.

Max wind above 500m

Southeasterly 40mph later.

Temperature

Valleys:
Zero, becoming plus 5 Celsius.
800m:
Plus 3 Celsius.
Freezing level:
Above the summits.

Issued at: 0314 on Wed 26 Nov 2014

Fri 28 Nov 2014

A windy day, with a risk of gales over the peaks. Also remaining cloudy and quite dull, with often persistent hill fog, especially across southern and eastern facing slopes. The odd spot of drizzle is also possible across the peaks.

Issued at: 0314 on Wed 26 Nov 2014

Sat 29 Nov 2014

Mostly dry with variable cloud amounts and some brighter spells developing through the day, especially across western parts. Winds also easing during Saturday.

Issued at: 0314 on Wed 26 Nov 2014

Sun 30 Nov 2014

Another mostly dry day with variable amounts of cloud and some brighter spells developing.

Issued at: 0314 on Wed 26 Nov 2014