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Updated: 0706 on Wed 23 Apr 2014
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Snowdonia: forecast radar

Wednesday, 23 April 2014: dawn to dusk

Printable view Forecast issued: 0440 on Wednesday, 23 April 2014

Overview for Wednesday

Heavy persistent rain spreading in during the morning. This fragmenting through the day, with heavy showers possible during the afternoon. However some warm brighter spells developing as well.

Hazards Risk Explanation
Blizzards No Risk  
Heavy snow No Risk  
Storm force winds No Risk  
Gales Low Gusts of around 50mph are likely over the highest points. Difficult conditions likely on ridges.
Severe chill effect No Risk  
Persistent and extensive hill fog Medium Patches above 400m leading to difficult navigation, mostly over western and southern slopes.
Thunderstorms Low Scattered heavy showers possible later in the day.
Heavy persistent rain High Morning rain followed by heavy showers, will lead to treacherous ground conditions.
Strong Sunlight No Risk  

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
Light rain
Light rain
Light rain
Light rain
Heavy Rain
Heavy Rain
Heavy Rain
Heavy Rain
60% 70% 80% 80%

Detailed mountain weather forecast: Snowdonia

Wednesday

Weather

Increasingly wet during the morning with rain and low cloud spreading in from the west, bringing patchy hill fog. This will break up later in the afternoon, with some warm brighter spells becoming likely, mainly over the western hills. However, one or two showery outbreaks will then become possible. These ease overnight, with clearer spells developing, although some rain could persist in the east.

Visibility

Good at first, but turning moderate to poor in rain, although occasionally good again in brighter intervals. Very poor in hill fog.

Hill fog

Well broken at 400m during the morning. Lifting and clearing some summits during the afternoon at times, although ragged patches around 400m returning during heavy showers.

Maximum winds above 500m

Southerly 50mph

Temperature

Valleys Plus 7 rising Plus 15 Celsius
900 m Plus 3 Celsius.
Freezing level Above the summits

Thursday

Weather

Any rain persisting in the east will quickly clear through the early hours. Mist and fog is then likely to form in the valley, and this will lift during the morning bringing a brief period of hill fog. However once this clears, warm sunny spells will develop. A scattering of heavy showers is possible later in the day, and these could be thundery at times before easing during the evening.

Visibility

Generally very good, but moderate to poor in rain, and very poor in hill fog.

Hill fog

Fog likely in valleys during the morning, this will lift to give a brief period of hill fog above 200m. However by midday, most summits will be clear. Although some ragged patches to 400m are possible during heavy showers.

Maximum winds above 500m

Southwesterly 15mph

Temperature

Valleys Plus 5 rising Plus 15 Celsius.
900 m Plus 3 Celsius.
Freezing level Above the summits.

Outlook

Friday

Perhaps slightly drier and brighter than Thursday but a few sharp showers are still likely at times. It will turn cloudy, wet and windy overnight. The freezing level will stay above the summits.

Saturday

A rather cloudy day with strong winds at times and outbreaks of rain becoming persistent. Hill fog is likely to become extensive. The freezing level will be above the summits.

Sunday

Cloudy with outbreaks of rain through the morning, this likely to gradually clear to scattered showers through the day. Further persistent rain is likely later in the day. Freezing levels above the summits.

Latest: 20/04/2014 15:53 There is no recent report of the ground conditions available from the National Park wardens

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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