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Updated: 1121 on Fri 19 Mar 2010
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Eryri: latest pressure

Dydd Gwener, 19 Mawrth 2010: Wawr hyd Machlud

Cyhoeddwyd: 0447 on Dydd Gwener, 19 Mawrth 2010

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Sefyllfa cyffredinol Dydd Gwener

Cloudy but mostly dry until late afternoon with one or two sunny spells possible. Rain perhaps reaching southern areas around sunset.

Peryglon Risgiau Eglurhad
Stormydd eira No Risk  
Eira trwm No Risk  
Gwyntoedd nerth storom No Risk  
Tymhestloedd Low Low risk of gusts to 50 mph over the highest peaks and ridges at first this morning.
Effaith oeri difrifol No Risk  
Niwl hirbarhaol ac eang dros y bryniau No Risk  
Stormydd o daranau No Risk  
Glaw trwm di-baid No Risk  

Esboniad o'r peryglon

Crynodeb a thebygolrwydd gwlybaniaeth Dydd Gwener
O'r Wawr hyd 0900 0900 hyd 1200 1200 hyd 1500 1500 hyd Machlud
Sunny intervals
Sunny intervals 		Sunny intervals
Sunny intervals 		Cloudy
Cloudy 		Light rain
Light rain
0% 0% 0% 30%

Rhagolygon y tywydd manwl ar gyfer y mynyddoedd: Eryri

Dydd Gwener

Tywydd

A mostly cloudy but dry day in Snowdonia, perhaps with a few sunny spells during this morning and bright spells at first this afternoon. However cloud will thicken later this afternoon, perhaps bringing some outbreaks of rain towards dusk across southern areas of the Park.

Gwelededd

Generally moderate or good, although perhaps becoming poor in rain later. Very poor in any hill fog.

Niwl dros y bryniau

Patchy hill fog is possible above 600 metres this morning, mainly in the west, otherwise nil.

Gwyntoedd uchaf uwch ben 500m

Southwest 30 to 35 mph with gusts to 50 mph at first this morning.

Tymheredd

Dyffrynnoedd Plus 10 Celsius.
900 m Plus 4 Celsius.
Lefel rhewi Above the summits.

Dydd Sadwrn

Tywydd

Remaining cloudy throughout the day with outbreaks of rain, although some drier interludes may develop later. Rain may be heavy at times, especially during the morning.

Gwelededd

Generally moderate, but occasionally poor in heavier rain and very poor in hill fog.

Niwl dros y bryniau

Widespread hill fog above 400 metres, with occasional patches around 200 metres, mostly across the west.

Gwyntoedd uchaf uwch ben 500m

Southwesterly becoming northwesterly 25-30 mph, with gusts to 40 mph.

Tymheredd

Dyffrynnoedd Plus 9 Celsius.
900 m Plus 5 Celsius.
Lefel rhewi Above the summits.

Rhagolygon

Dydd Sul

Rain clearing early to leave a mostly dry day, although staying rather cloudy. One or two showers remain likely with brisk southwesterly winds.

Dydd Llun

Staying mild and damp, with rain and a good deal of low cloud likely. Moderate southerly winds will turn westerly through the day.

Dydd Mawrth

Remaining unsettled and mild, with further rain or showers and moderate westerly winds.

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