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Updated: 1521 on Wed 18 Jun 2014
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Snowdonia: latest pressure

Tuesday, 16 September 2014: dawn to dusk

Printable view Forecast issued: 0443 on Tuesday, 16 September 2014

Overview for Tuesday

Cloudy with hill fog at first, then warm with sunny spells in the afternoon.

Hazards Risk Explanation
Blizzards No Risk  
Heavy snow No Risk  
Storm force winds No Risk  
Gales No Risk  
Severe chill effect No Risk  
Persistent and extensive hill fog Medium Extensive hill fog at first, above 200 m in the east and 600 m in the west. Lifting later.
Thunderstorms No Risk  
Heavy persistent rain No Risk  
Strong Sunlight Medium Sunny spells will lead to a risk of sunburn, mainly in the afternoon.

key to hazards and forecast content

Weather summary and probability of precipitation for Tuesday
Dawn to 0900 0900 to 1200 1200 to 1500 1500 to dusk
Mist
Mist
Sunny intervals
Sunny intervals
Sunny intervals
Sunny intervals
Sunny intervals
Sunny intervals
0% 0% 0% 20%

Detailed mountain weather forecast: Snowdonia

Tuesday

Weather

It will be a cloudy start to the day with hill fog over most hills, although it will be most persistent in the east. There may be some patchy drizzle too, but it will slowly brighten up through the day to become fine and warm with some extended sunny spells in the afternoon. An isolated shower is possible in the evening, but it will otherwise stay dry with hill fog not returning until later in the night.

Visibility

Generally moderate at first, but poor to very poor in hill fog and drizzle. Becoming good in the afternoon.

Hill fog

Persistent hill fog in the east above and around 200 m at first and periods of hill fog will also affect the west above 600 m. This will slowly lift and break to clear in the afternoon, although occasional patches are still possible on the highest summits.

Maximum winds above 500m

Southeasterly 25 mph.

Temperature

Valleys Plus 11 becoming Plus 19 Celsius.
900 m Plus 12 Celsius.
Freezing level Above the summits.

Wednesday

Weather

Generally dry, cloudy and misty to start. There will be some persistent hill fog in the east and periods of hill fog in the west. Slowly brightening up to become warm with sunny spells through the afternoon. Risk of cloud and hill fog returning again overnight.

Visibility

Generally moderate at first, but poor to very poor in hill fog. Becoming good in the afternoon.

Hill fog

Persistent hill fog in the east above and around 300 m at first and periods of hill fog will also affect the west above 600 m. This will slowly lift and break to clear in the afternoon, although occasional patches are still possible on the summits.

Maximum winds above 500m

Easterly 30 mph.

Temperature

Valleys Plus 12 becoming Plus 20 Celsius.
900 m Plus 11 Celsius.
Freezing level Above the summits.

Outlook

Thursday

Another fine and dry day on the hills, although the odd isolated shower cannot be ruled out. Mostly cloudy to start with some persistent hill fog, but this will lift and clear to become bright with some warm sunny spells. Winds will generally be light, but moderate on the tops.

Friday

Mostly fine and dry again on Friday, although the odd shower is possible. There will be variable cloud with some persistent hill fog through the morning, but there will be some warm sunny spells too. Generally light winds.

Saturday

Saturday will be mostly fine once again, with a small risk of an isolated shower. Persistent hill fog will lift and clear to become bright and warm with spells of sunshine in the afternoon. Generally light winds.

Observations

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Weather warnings for Wales

Weather forecast for Wales

The Enhanced Mountain forecast for Snowdonia has been discontinued. All forecast information for these locations can be found in the standard Mountain forecast above.

North East England West Midlands Grampian South West England Central, Tayside & Fife Northern Ireland North West England East of England Highlands & Eilean Siar Strathclyde Wales East Midlands SW Scotland, Lothian Borders London & South East England Yorkshire & Humber

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