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Updated: 1010 on Tue 1 Jul 2014
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Snowdonia: latest radar

Thursday, 18 September 2014: dawn to dusk

Printable view Forecast issued: 0453 on Thursday, 18 September 2014

Overview for Thursday

Another grey, murky start. Brightening up with some sunshine. Low chance of an isolated thunderstorm.

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 first thing but lifting and breaking during the morning.
Thunderstorms Low There is a low chance of an isolated thunderstorm in the afternoon.
Heavy persistent rain No Risk  
Strong Sunlight Low Potential for sunburn in any prolonged sunny spells.

key to hazards and forecast content

Weather summary and probability of precipitation for Thursday
Dawn to 0900 0900 to 1200 1200 to 1500 1500 to dusk
Mist
Mist
Sunny intervals
Sunny intervals
Sunny intervals
Sunny intervals
Light rain showers
Light rain showers
20% 0% 10% 20%

Detailed mountain weather forecast: Snowdonia

Thursday

Weather

Another grey, murky start with hill fog, low cloud and mist. Brightening up through the morning with some sunshine developing. Mostly dry, but an isolated thunderstorm cannot be ruled out. Turning misty again overnight.

Visibility

Generally moderate at first, but very poor in mist and hill fog. Becoming good in the afternoon, but poor in any thunderstorms.

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. Hill fog possible down to 400m in heavy showers.

Maximum winds above 500m

Easterly 20 mph.

Temperature

Valleys Plus 12 Celsius becoming plus 19 Celsius.
900 m Plus 13 Celsius.
Freezing level Well above the summits.

Friday

Weather

Again, a misty start with hill fog. Brightening a little through the day, but also the chance of an isolated odd heavy and thundery shower, especially later on.

Visibility

Generally good, but moderate in showers, poor in heavy showers and very poor in mist and hill fog.

Hill fog

Persistent hill fog above around 200 m in the east at first and periods of hill fog down to 500 m in the west. This will be slow to break but should become patchy at around 600 m through the afternoon. Hill fog possible down to 400m in heavy showers.

Maximum winds above 500m

East 20 mph.

Temperature

Valleys Plus 13 Celsius becoming plus 18 Celsius.
900 m Plus 13 Celsius.
Freezing level Well above the summits.

Outlook

Saturday

Another grey start, then some bright spells and a few heavy showers possible. Light east-northeast wind.

Sunday

Largely dry, often cloudy but a few bright or sunny spells. Cooler than recent days. Gentle east-northeast wind.

Monday

Largely dry and fine with some sunny spells. Light easterly breeze.

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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