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Updated: 2214 on Fri 19 Mar 2010
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Eryri: latest visual satellite

Dydd Sadwrn, 20 Mawrth 2010: Wawr hyd Machlud

Printable view Cyhoeddwyd: 1613 on Dydd Gwener, 19 Mawrth 2010

Sefyllfa cyffredinol Dydd Sadwrn

Cloudy and wet at first, becoming drier and brighter but also windier later.

Peryglon Risgiau Eglurhad
Stormydd eira No Risk  
Eira trwm No Risk  
Gwyntoedd nerth storom No Risk  
Tymhestloedd Medium Winds may gust to 50mph at times during the day, most likely in the afternoon.
Effaith oeri difrifol Low Feeling cold around the summits in the mid to late afternoon as winds strengthen.
Niwl hirbarhaol ac eang dros y bryniau High Hill fog likely above 300 metres in the morning, gradually lifting and breaking in the afternoon.
Stormydd o daranau No Risk  
Glaw trwm di-baid High Heavy rain is likely from dawn until midday.

Esboniad o'r peryglon

Crynodeb a thebygolrwydd gwlybaniaeth Dydd Sadwrn
O'r Wawr hyd 0900 0900 hyd 1200 1200 hyd 1500 1500 hyd Machlud
Heavy Rain
Heavy Rain
Heavy Rain
Heavy Rain
Light rain
Light rain
Light rain
Light rain
100% >90% 70% 40%

Rhagolygon y tywydd manwl ar gyfer y mynyddoedd: Eryri

Dydd Sadwrn

Tywydd

Overcast with heavy rain at first and extensive hill fog. Rain continues for the rest of the morning but eases by the afternoon, with drier and brighter weather moving in from the west before the end of the day.

Gwelededd

Generally poor at first, and less than 200 metres in hill fog. Becoming good during the afternoon.

Niwl dros y bryniau

Extensive hill fog above 300 metres will persist throughout the morning. It will begin to lift and break in the afternoon with only occasional hill fog at around 600 metres likely by the end of the day.

Gwyntoedd uchaf uwch ben 500m

Southwesterly 25-30mph becoming northerly 30-40mph gusting 50mph at times.

Tymheredd

Dyffrynnoedd Plus 8 Celsius.
900 m Plus 6 Celsius at first, falling to plus 1 Celsius in the afternoon.
Lefel rhewi Above summits.

Dydd Sul

Tywydd

Dry at first on Sunday with light winds and some sunny periods. It gradually becomes cloudier during the morning with outbreaks of rain likely in the afternoon and early evening. This rain should stay quite light though and some places could have a mainly dry day.

Gwelededd

Good or very good but falling to poor in afternoon rain and to less than 200 metres in hill fog.

Niwl dros y bryniau

Occasional patches around 800 metres, becoming more extensive and descending to 500 metres in afternoon rain.

Gwyntoedd uchaf uwch ben 500m

Westerly 15-20mph becoming southwesterly 30-40mph.

Tymheredd

Dyffrynnoedd Plus 5 Celsius increasing to plus 7 Celsius.
900 m Plus 2 Celsius
Lefel rhewi Above summits.

Rhagolygon

Dydd Llun

Remaining unsettled with strong winds gusting to around gale force at times. Rain is likely to be heavy and persistent and there is likely to be extensive hill fog. The freezing level may just touch the summits at some point during the day.

Dydd Mawrth

A respite from the unsettled weather likely on Tuesday, with clear and dry conditions expected. It will be rather windy at first with a risk of gale force gusts around the summits, but should become calmer during the day. The freezing level should remain around the summits.

Dydd Mercher

A return to the wet and windy weather on Wednesday, with occasional rain spreading from the west, possibly becoming heavier and more persistent by the end of the day. It will become windy too with gales likely around the summits.

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