Issued 0348 Saturday, 04 July 2009
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Cyhoeddwyd 0348 Dydd Sadwrn, 04 Gorffennaf 2009
 Sunrise / Codiad Haul : 0400 , Sunset / Machlud Haul : 2035
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Hazards / Peryglon
No hazards. |
Forecast for daylight hours for Saturday / Rhagolwg ar gyfer oriau'r dydd Dydd Sadwrn
| General situation / Sefyllfa cyffredinol Sunny intervals and showers, the showers most frequent later this morning, and possibly heavy at times. | ||
| Weather / Tywydd Sunny intervals and showers, after a brief dry start to the day. The showers will be most frequent later this morning, but still scattered showers will occur this afternoon. The showers will be heavy at times. Rather windy on higher peaks and ridges. | ||
| Visibility / Gwelededd Moderate or poor at first, and very poor any hill fog. However the visibility will improve very good during the morning. Then temporarily falling moderate with the heavier showers. | ||
| Cloud base / Gwaelod y cymylau Well broken low cloud at first around 700 metres, this quickly lifting and clearing. However temporary broken low cloud is possible down to 700 metres with the showers, but generally the summits will remain clear. | ||
| Wind / Gwynt | Temperature / Thymheredd | |
| 300m | Southerly 5 to 10 mph increasing 10 to 15mph, with gusts 25 mph. | 14 Celsius, increasing to 21 Celsius by afternoon. |
| 500m | Southerly 15 to 20mph with gusts to 35mph. | 12 Celsius, increasing to 17 Celsius by afternoon. |
| 800m | Southerly 25 to 30mph with gusts to 40mph. | 10 Celsius, increasing to 14 Celsius by afternoon. |
| Freezing level / Lefel rhewi Above the tops. | ||
Forecast for daylight hours for Sunday / Rhagolwg ar gyfer oriau'r dydd Dydd Sul
| Weather / Tywydd Sunshine and scattered showers, with the showers turning heavy and perhaps thundery from mid afternoon onwards. Any early patchy low cloud and mist quickly clearing. |
| Visibility and cloud base / Gwelededd a gwaelod y cymylau Very poor in any hill fog at first, otherwise good or very good. Falling moderate in any heavier showers later.. Possibly some well broken lwo cloud down to 300 metres at first, mainly across the south of the Park, lifting and breaking early morning. However most places will start clear of low cloud. Then broken low cloud is possible down to 700 metres in association with heavier showers later. |
| Wind, temperature and freezing level / Gwynt, thymheredd a lefel rhewi Southwesterly 25 to 30mph with gusts to 40mph. / 10 Celsius, increasing to 13 Celsius by afternoon. / Above the tops. |
Outlook for Monday / Rhagolygon ar gyfer Dydd Llun
A breezy day with sunshine and showers. Some of the showers are likely to be heavy with a small risk of thunder. Patchy hill fog may occur down to 700 metres during and after heavy showers. Good visibility falling temporarily moderate in heavier showers. The westerly wind will strengthen to become moderate to fresh at higher levels through the afternoon and evening.
Outlook for Tuesday / Rhagolygon ar gyfer Dydd Mawrth
A windy day with sunshine and showers, some showers heavy with a risk of hail and thunder. Low risk of westerly gales over higher peaks and ridges. Good visibility falling temporarily moderate in heavier showers.
Outlook for Wednesday / Rhagolygon ar gyfer Dydd Mercher
Sunny spells and just one or two passing light showers. Good visibility with cloud bases mainly above the tops. Breezy, especially at highest level, with moderate or fresh northwest winds.
