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Updated: 0811 on Mon 30 Jun 2014
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Snowdonia: forecast pressure

Saturday, 30 August 2014: dawn to dusk

Printable view Forecast issued: 0956 on Saturday, 30 August 2014

Overview for Saturday

Cloudy with hill fog and occasional some shwoery rain during the morning. The showery outbreaks will ease through 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 High Extensive above 500-700m overnight, becoming more broken during the day on Saturday.
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 Saturday
Dawn to 0900 0900 to 1200 1200 to 1500 1500 to dusk
Light rain showers
Light rain showers
Light rain showers
Light rain showers
Sunny intervals
Sunny intervals
Light rain showers
Light rain showers
60% 60% 30% 60%

Detailed mountain weather forecast: Snowdonia

Saturday

Weather

A generally cloudy start with some showery rain. Brightening at times through the day, but with further showers at times. Largely dry through the evening and night. Quite a windy day at higher levels of the park.

Visibility

Generally good, but moderate in any showery rain. Very poor in hill fog.

Hill fog

Fairly extensive hill fog first thing, becoming persistent above around 500m in western areas and 700 metres in eastern areas. Becoming more broken from mid-morning with just occasional patches above 700m for a time. Hill fog perhaps becoming more widespread and gradually lowering through the evening.

Maximum winds above 500m

Westerly 25-30mph gusting 35-40mph at times over the highest summits.

Temperature

Valleys 13 degrees Celsius, rising to 18 degrees Celsius.
900 m Plus 8 Celsius
Freezing level Well above the summits.

Sunday

Weather

Mostly dry and cloudy during the overnight period, although the cloud may be thick enough to give the odd light showery outbreak. Mainly dry conditions continuing through the day, but an increasing risk of patchy rain and drizzle developing during the evening along with widespread and persistent hill fog.

Visibility

Generally good but moderate in any showery outbreaks, and poor in rain and drizzle later. Very poor in hill fog.

Hill fog

Occasional patches (persistent on Snowdon Range on the coastal hills) above 400-600m during the overnight period. Becoming less extensive with bases rising to perhaps 700-800m during the morning, but soon lowering and becoming widespread across the park. By late-afternoon, most hills above 300-400m will be shrouded in persistent hill fog making navigation difficult.

Maximum winds above 500m

Westerly 15-20mph with occasional gusts 25-30mph for most of the day, but increasing to 25mph gusting 35-40mph later in the day.

Temperature

Valleys 11 degrees Celsius, rising to 18 degrees Celsius.
900 m Plus 9 Celsius
Freezing level Well above the summits.

Outlook

Monday

It will probably be a cloudy morning with a risk of some occasional rain and drizzle. Through the day, it is likely to become generally dry with some sunshine developing during the afternoon. Light to moderate westerly or northwesterly winds.

Tuesday

Probably dry on Tuesday, but with large uncertainties regarding cloud amounts. Some bright or sunny periods are likely and these may well be most prolonged in western areas of the park. Light to moderate easterly or southeasterly winds developing.

Wednesday

Any early mist or fog patches should quickly clear to leave a dry and fine day with a good deal of sunshine, particularly first thing. During the day, the cloud may well build, however this should stay largely above the summits. Winds are likely to be light and variable.

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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