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RainfallPressureCloud amount forecastWarnings
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Forecast
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Daytime Sun 20 Apr 2014 Daytime Mon 21 Apr 2014 Daytime Tue 22 Apr 2014 Daytime Wed 23 Apr 2014 Daytime Thu 24 Apr 2014
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Updated: 0522 on Sun 20 Apr 2014
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Snowdonia: forecast uv

Sunday, 20 April 2014: dawn to dusk

Printable view Forecast issued: 0247 on Sunday, 20 April 2014

Overview for Sunday

A dry, fairly bright start, becoming mostly cloudy later with some rain possible later. Cooler and windier than of late.

Hazards Risk Explanation
Blizzards No Risk  
Heavy snow No Risk  
Storm force winds No Risk  
Gales Low Northeasterly winds may reach 40-50mph during the afternoon.
Severe chill effect Medium Strong northeasterly winds combined with cloud will make it feel cold at height.
Persistent and extensive hill fog Low Some fog developing above around 600m.
Thunderstorms No Risk  
Heavy persistent rain No Risk  
Strong Sunlight No Risk  

key to hazards and forecast content

Weather summary and probability of precipitation for Sunday
Dawn to 0900 0900 to 1200 1200 to 1500 1500 to dusk
Sunny intervals
Sunny intervals
Light rain showers
Light rain showers
Light rain showers
Light rain showers
Light rain
Light rain
0% 20% 20% 30%

Detailed mountain weather forecast: Snowdonia

Sunday

Weather

Cloud increasing from the east to bring some patches of hill fog, especially on northern and eastern slopes. Much of the morning will stay dry with some bright or sunny spells, but a few showers are possible. During the afternoon there is an increasing chance of some rain spreading from the south, but the most persistent rain should hold off until overnight when there could be some heavier bursts. Northeasterly winds will increase through the day, perhaps reaching gale force over exposed summits, making walking difficult with a distinct wind chill.

Visibility

Good or very good becoming moderate in rain and poor in heavy rain. Very poor in hill fog.

Hill fog

Patches of cloud above around 600m but with some as low as 200m, especially on east and north facing hills. The cloud will tend to break and lift for a time before lowering and becoming more extensive towards evening.

Maximum winds above 500m

Northeasterly 40-50mph.

Temperature

Valleys Plus 1 Celsius rising to plus 14 Celsius.
900 m Plus 3 Celsius rising to plus 7 Celsius.
Freezing level Above the summits.

Monday

Weather

Another unsettled day with showers or longer spells of rain which could be heavy at times bringing a risk of hill fog. However, there will also be some limited drier, brighter spells. Brisk east or northeasterly winds will continue taking the edge off temperatures.

Visibility

Good to moderate with rain or showers, locally poor in heavy rain and very poor in hill fog.

Hill fog

Periods of broken cloud above 400-500m, but occasionally as low as 200m in heavy showers and at first.

Maximum winds above 500m

Northeasterly 40-50mph, easing.

Temperature

Valleys Plus 6 Celsius rising to plus 16 Celsius.
900 m Plus 5 Celsius.
Freezing level Above the summits.

Outlook

Tuesday

With lighter winds than recent days there could be some fog patches in the valleys to start the day. These clearing to allow some bright spells but also heavy showers, possibly thundery.

Wednesday

Some fog patches again possible at first, but these soon clearing as south or southeasterly winds increase as a spell of rain moves northeastwards across Wales. Some brighter spells following the rain with showers.

Thursday

Another unsettled day with a mix of bright or sunny spells and showers which could be heavy at times. Winds will be fairly light so there could be some fog patches to clear in the morning. Temperatures around average or a little above in any sunshine.

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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