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Snowdonia

Weather hazards over 1000ft

High risk

No high risks
none

Medium risk

Persistent extensive hill fog
Valley mist and fog will lift during the morning to give a period of hill fog.
Strong sunlight
A risk of sunburn in prolonged sunny spells.

Low risk

Thunderstorms
Heavy showers may turn thundery in the afternoon.

No risk

Blizzards
none
Heavy snow
none
Storm force winds
none
Gales
none
Severe chill effect
none
Heavy persistent rain
none

Thu 24 Apr 2014

Valley mist and fog patches will lift during the morning to bring a period of hill fog, however once this clears there will be plenty of warm sunshine. A few showers, perhaps heavy and thundery are possible during the afternoon bringing some cloud across the highest summits. Any showers will fade during the evening to leave a fine end to the day.

Time
0600 to 0900 0900 to 1200 1200 to 1500 1500 to 1800 1800 to 2100 2100 to 2400
Weather
Overcast Sunny intervals Light shower day Sunny intervals Sunny intervals Clear night
Precipitation probability
0% 10% 30% 30% 10% 0%

Visibility

Poor or very poor in mist and fog but steadily improving to become very good by afternoon, but reduced to moderate in showers.

Hill Fog

Valley mist and fog will lift during the morning to give a period of hill fog. By midday cloud will be clear of most summits with some patches around 600-800m during showers.

Max wind above 500m

Southeasterly 10mph.

Temperature

Valleys:
Plus 2 Celsius rising to plus 14 Celsius.
800m:
Plus 3 Celsius rising to plus 5.
Freezing level:
Above the summits.

Issued at: 0349 on Thu 24 Apr 2014

Fri 25 Apr 2014

A dry start with some mist and fog patches initially, then some brighter spells developing as this lifts. However there will be a fair amount of cloud throughout with showers likely at times, perhaps heavy and thundery. Later in the day a spell of heavier, more persistent rain may spread from the southeast, but there remains low confidence in this. Light winds throughout and feeling pleasant in any sunshine.

Visibility

Poor or very poor in mist and fog, but improving to good or very good. Moderate in showers, becoming poor in nay heavy showers or rain later.

Hill Fog

Mist and fog in the valleys will lift into hill fog during the morning, becoming occasional at around 500m, especially on eastern slopes.

Max wind above 500m

Southeasterly 10mph.

Temperature

Valleys:
Plus 3 Celsius rising to plus 13 Celsius.
800m:
Plus 5 Celsius.
Freezing level:
Above the summits.

Issued at: 0349 on Thu 24 Apr 2014

Sat 26 Apr 2014

A mostly cloudy, unsettled day with showers or more persistent bands of rain crossing the park with strong southeasterly winds. Hill fog will blanket the hills.

Issued at: 0349 on Thu 24 Apr 2014

Sun 27 Apr 2014

Another changeable day, although perhaps not quite as breezy or as cloudy as Saturday. However, there will be still be scattered, heavy showers. Hill fog will still be quite extensive with some mist and fog in the valleys too.

Issued at: 0349 on Thu 24 Apr 2014

Mon 28 Apr 2014

Light winds will allow for some morning mist and fog, then some brighter spells developing but also some showers.

Issued at: 0349 on Thu 24 Apr 2014