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

Wednesday, 17 September 2014: dawn to dusk

Printable view Forecast issued: 0438 on Wednesday, 17 September 2014

Overview for Wednesday

Mist and low cloud slow to clear at first. Brightening up by the end of the morning with some warm sunny spells and an easterly breeze.

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 High Persistent hill fog at first, down to 300 m in the east and 600 m in the west. Returning later.
Thunderstorms No Risk  
Heavy persistent rain No Risk  
Strong Sunlight Medium Risk of sunburn during any prolonged spells of afternoon sunshine.

key to hazards and forecast content

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

Detailed mountain weather forecast: Snowdonia

Wednesday

Weather

Generally dry, cloudy and misty during the early hours with some persistent hill fog, particularly in the east. Conditions will then slowly brighten up to become warm with sunny spells by the afternoon, before the risk of cloud and hill fog returning again overnight.

Visibility

Generally moderate at first, although poor to very poor in hill fog. Becoming good by the middle of the day.

Hill fog

Persistent hill fog above around 300 m in the east, and periods of hill fog down to 600 m in the west. This will slowly lift and break to clear by the end of the morning, although occasional patches are still possible on the summits.

Maximum winds above 500m

Easterly 30 mph.

Temperature

Valleys Plus 11 becoming 22 Celsius.
900 m Plus 13 Celsius.
Freezing level Above the summits.

Thursday

Weather

Another fine and dry day on the hills. Mostly cloudy at first with some persistent hill fog and mist once again, but this will lift and clear to become bright with warm sunny spells later. Winds will be moderate across the tops at first, then ease during the afternoon.

Visibility

Moderate, but very poor in mist and hill fog at first. Gradually improving to good.

Hill fog

Persistent hill fog above around 300 m in the east, and periods of hill fog down to 600 m in the west. This will slowly lift and break to clear by the end of the morning, although occasional patches are still possible on the summits.

Maximum winds above 500m

Southeasterly 35 mph, easing to 20 mph during the afternoon.

Temperature

Valleys Plus 12 increasing to 23 Celsius.
900 m Plus 13 Celsius.
Freezing level Above the summits.

Outlook

Friday

Scattered heavy showers may spread across the south of the park on Friday, these occasionally turning thundery, with gusty winds. Low cloud at first will be slow to clear once again, and patchy hill fog is likely throughout the day, however warm sunny spells should develop during the afternoon.

Saturday

A dull start with a mixture of hill fog and scattered heavy showers. Gradually turning brighter with a drier end to the day. Winds will generally be light away from any showers, and it should feel warm once again in afternoon sunny intervals.

Sunday

A brighter start is expected and a largely dry day is expected with an increased chance of sunny periods. The light easterly breeze continues.

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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