Eryri mountain area forecast
Dydd Sul, 22 Tachwedd 2009: Wawr hyd Machlud
Cyhoeddwyd: 1652 on Dydd Sadwrn, 21 Tachwedd 2009
Latest pressure
Updated: 2108 on Sat 21 Nov 2009
Digital Map Data:
© Collins Bartholomew Ltd (2006)
Sefyllfa cyffredinol Dydd Sul
A brighter day, but very windy with strong to gale force winds throughout. Also, frequent showers, some heavy with the risk of hail.
| Peryglon | Risgiau | Eglurhad |
|---|---|---|
| Stormydd eira | No Risk | |
| Eira trwm | No Risk | |
| Gwyntoedd nerth storom | High | Southwesterly, gusts up to 60 mph, with the risk of 70 mph over 700m |
| Tymhestloedd | High | Southwesterly, gusts up to 60 mph likely, particularly on exposed ridges. |
| Effaith oeri difrifol | High | In showers and especially above 700m. |
| Niwl hirbarhaol ac eang dros y bryniau | Low | Occasional patches of hill fog in and around showers above 600m. |
| Stormydd o daranau | Low | Low risk of thunder and lightning in any of the heavier showers. |
| Glaw trwm di-baid | Low | Low risk of heavy showers merging together to form longer periods of rain during the afternoon. |
| O'r Wawr hyd 0900 | 0900 hyd 1200 | 1200 hyd 1500 | 1500 hyd Machlud |
 Heavy rain showers |
Heavy rain showers |
Heavy rain showers |
Heavy rain showers |
| 60% | 60% | 70% | 90% |
Rhagolygon y tywydd manwl ar gyfer y mynyddoedd: Eryri
Dydd Sul
Tywydd
Brighter but very windy with strong to gale-force winds together with frequent showers, some heavy with the risk of hail. Largely cloudy but some sunshine can be expected in between the showers.
Gwelededd
Generally moderate to good, but poor in heavy showers and very poor in any hill fog.
Niwl dros y bryniau
Occasional patches above around 700 metres.
Gwyntoedd uchaf uwch ben 500m
Southwest 45 to 55 mph gusting 60-70 mph.
Tymheredd
| Dyffrynnoedd | Plus 9 Celsius. |
| 900 m | Plus 2 Celsius. |
| Lefel rhewi | 1100m, just above the Snowdon summit. |
Dydd Llun
Tywydd
Another windy day with strong westerly winds, but brighter with more in the way of sunny spells in between occasional, mainly light showers. Showers easing during the afternoon period allowing more in the way of sunshine.
Gwelededd
Moderate or good but occasionally poor in showers and very poor in any hill fog.
Niwl dros y bryniau
Occasional patches above 600 metres.
Gwyntoedd uchaf uwch ben 500m
Westerly 30-40mph gusting 55mph.
Tymheredd
| Dyffrynnoedd | Plus 8 Celsius. |
| 900 m | Plus 2 Celsius. |
| Lefel rhewi | Above the summits. |
Rhagolygon
Dydd Mawrth
Remaining unsettled with more strong to gale-force southwesterly winds, and some spells of persistent, heavy rain. Periods of hill fog are likely.
Dydd Mercher
Very windy with strong to gale-force west or southwesterly winds, and further heavy showers throughout the day. Occasional patches of hill fog.
Dydd Iau
Winds easing but still remaining unsettled with scattered showers and variable amounts of cloud. Occasional hill fog.
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