Issued 0329 GMT Saturday, 21 November 2009
/
Cyhoeddwyd 0329 GMT Dydd Sadwrn, 21 Tachwedd 2009
 Sunrise / Codiad Haul : 0745 GMT, Sunset / Machlud Haul : 1614
GMT |
Hazards / Peryglon
Gales. Persistent extensive hill fog. Heavy persistent rain. |
Forecast for daylight hours for Saturday / Rhagolwg ar gyfer oriau'r dydd Dydd Sadwrn
| General situation / Sefyllfa cyffredinol Outbreaks of rain becoming heavier and more widespread this morning, accompanied by strengthening winds. Around sunset dry and clearer conditions may arrive across the west of the Park. | ||
| Weather / Tywydd Starting cloudy with outbreaks of mostly light rain. The rain will become heavier and more persistent later this morning, leaving a wet afternoon. Hill fog becoming extensive and southerly gales developing over the higher ground. | ||
| Visibility / Gwelededd Moderate or poor for much of the day in rain and very poor in hill fog. | ||
| Cloud base / Gwaelod y cymylau Occasional low cloud above 200 metres at first across the south and east. Becoming widespread or blanket above 300 metres this morning, rising to above 600 metres this afternoon. | ||
| Wind / Gwynt | Temperature / Thymheredd | |
| 300m | Southeast 10 to 15 mph increasing 20 to 30 mph with gusts around 40 mph. | Plus 13 Celsius. |
| 500m | Southerly 20 to 30 mph increasing 40 mph with gusts 50 mph this afternoon. | Plus 11 Celsius. |
| 800m | Wind gusting 50 to 60 mph this afternoon above 600 metres. | Plus 9 Celsius. |
| Freezing level / Lefel rhewi Well above the summits. | ||
Forecast for daylight hours for Sunday / Rhagolwg ar gyfer oriau'r dydd Dydd Sul
| Weather / Tywydd A very windy day. Bright or sunny spells are likely at times with broken cloud but there will be blustery showers, heavy and also prolonged, especially during the afternoon. Gale or perhaps severe gale force south or southwest winds. Occasional hill fog. |
| Visibility and cloud base / Gwelededd a gwaelod y cymylau Moderate or good but occasionally poor in heavier showers and very poor in hill fog.. Occasional low cloud above around 600 metres with patches at 400 metres in heavier showers. |
| Wind, temperature and freezing level / Gwynt, thymheredd a lefel rhewi Wind gusts 60 to 70 mph likely at times above around 600 metres. / Plus 7 Celsius. / Well above the summits. |
Outlook for Monday / Rhagolygon ar gyfer Dydd Llun
Unsettled with further showers or perhaps some longer spells of rain. Strong to gale force westerly winds. Occasional hill fog.
Outlook for Tuesday / Rhagolygon ar gyfer Dydd Mawrth
Continuing unsettled with further showers or perhaps some longer spells of rain. Strong to gale force westerly winds. Occasional hill fog.
Outlook for Wednesday / Rhagolygon ar gyfer Dydd Mercher
Another unsettled and windy day with occasional blustery showers and occasional hill fog.
Produced by Met Office in association with
