Forecast
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Eryri: forecast pressure
Dydd Sadwrn, 21 Tachwedd 2009: Wawr hyd Machlud
Sefyllfa cyffredinol Dydd Sadwrn
Outbreaks of light rain at first, followed by strengthening winds and heavy rain later this morning. Around sunset rain clearing away east.
| Peryglon | Risgiau | Eglurhad |
|---|---|---|
| Stormydd eira | No Risk | |
| Eira trwm | No Risk | |
| Gwyntoedd nerth storom | Medium | A risk of gusts increasing to around 70 mph this afternoon. |
| Tymhestloedd | High | Southerly winds strengthening this morning. Gusts in excess of 50 mph likely by this afternoon. |
| Effaith oeri difrifol | No Risk | |
| Niwl hirbarhaol ac eang dros y bryniau | High | Hill fog is likely to become extensive above around 600 metres this morning, clearing later. |
| Stormydd o daranau | No Risk | |
| Glaw trwm di-baid | High | Rain is likely to be heavy and persistent from late morning. |
| O'r Wawr hyd 0900 | 0900 hyd 1200 | 1200 hyd 1500 | 1500 hyd Machlud |
 Light rain |
Light rain |
 Heavy Rain |
Heavy Rain |
| 20% | 80% | 90% | 40% |
Rhagolygon y tywydd manwl ar gyfer y mynyddoedd: Eryri
Dydd Sadwrn
Tywydd
A cloudy start with outbreaks of mostly light rain. The rain becoming heavier later this morning as southerly gales develop over the higher ground, with hill fog becoming extensive. Late afternoon, around sunset, drier and clearer weather arriving from the west.
Gwelededd
Moderate or poor for much of the day in rain and very poor in hill fog.
Niwl dros y bryniau
Occasional patches above around 300 metres at first, mainly in the east. Becoming widespread or blanket above around 600 metres later this morning, then clearing from the west around sunset.
Gwyntoedd uchaf uwch ben 500m
Wind gusting 60 to 70 mph this afternoon above around 600 metres.
Tymheredd
| Dyffrynnoedd | Plus 13 Celsius. |
| 900 m | Plus 8 Celsius. |
| Lefel rhewi | Well above the summits. |
Dydd Sul
Tywydd
A very windy day. Bright or sunny spells are likely at times with broken cloud but there will be frequent blustery showers, heavy and sometimes prolonged, especially in the afternoon. Gale or perhaps severe gale force south or southwest winds. Occasional hill fog.
Gwelededd
Moderate or good but occasionally poor in heavier showers and very poor in hill fog.
Niwl dros y bryniau
Occasional above around 600 metres with patches at 400 metres in heavier showers.
Gwyntoedd uchaf uwch ben 500m
Wind gusts 70 to 80 mph possible at times above around 600 metres.
Tymheredd
| Dyffrynnoedd | Plus 10 to plus 12 Celsius. |
| 900 m | Plus 6 Celsius. |
| Lefel rhewi | Well above the summits. |
Rhagolygon
Dydd Llun
Unsettled with further showers or perhaps some longer spells of rain. Strong to gale force westerly winds. Occasional hill fog.
Dydd Mawrth
Continuing unsettled with further showers or perhaps some longer spells of rain. Strong to gale force westerly winds. Occasional hill fog.
Dydd Mercher
Another unsettled and windy day with occasional blustery showers and occasional hill fog.
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