Issued 1745 GMT Saturday, 07 November 2009
/
Cyhoeddwyd 1745 GMT Dydd Sadwrn, 07 Tachwedd 2009
 Sunrise / Codiad Haul : 0729 GMT, Sunset / Machlud Haul : 1632
GMT |
Hazards / Peryglon
Persistent extensive hill fog. Thunderstorms. Heavy persistent rain. |
Forecast for daylight hours for Sunday / Rhagolwg ar gyfer oriau'r dydd Dydd Sul
| General situation / Sefyllfa cyffredinol It will be a rather cloudy and misty morning with some scattered showers at first, but becoming brighter later and mainly dry. | ||
| Weather / Tywydd It will be a mainly cloudy and quite misty morning with a few showers or periods of mainly light rain. There is a low risk of lightning in heavier showers during the morning. However, conditions should brighten up later in the day with only isolated showers. | ||
| Visibility / Gwelededd The visibility will be generally moderate at first in mist and rain or showers, and poor in hill fog. Generally moderate or good during the afternoon. | ||
| Cloud base / Gwaelod y cymylau Hill fog will be widespread at first with cloud bases around 500 to 600 metres. Conditions will improve later with cloud bases rising to 700 to 800 metres with only patchy hill fog on the peaks. | ||
| Wind / Gwynt | Temperature / Thymheredd | |
| 300m | Winds northerly speeds 15 to 25 miles per hour, | Plus 5 becoming 10 Celsius |
| 500m | Winds northerly speeds 15 to 25 miles per hour, | Plus 5 Celsius |
| 900m | Winds northerly speeds 20 to 25 miles per hour, local gusts to 35 mph during the morning. | Plus 2 Celsius |
| Freezing level / Lefel rhewi The freezing level will be above the tops. | ||
Forecast for daylight hours for Monday / Rhagolwg ar gyfer oriau'r dydd Dydd Llun
| Weather / Tywydd It will be a misty start with some valley mist and fog patches and some low cloud on upslopes. Some bright spells may break through during the middle of the day. Cloud will increase through the afternoon with rain arriving in the west by around dusk. |
| Visibility and cloud base / Gwelededd a gwaelod y cymylau The visibility will be moderate in mist at first and poor in valley and hill fog. Becoming moderate or good for much of the afternoon period. . Hill fog will be widespread at first with low cloud on hills around 300 to 500 metres. Cloud bases lifting to 700 to 800 metres by midday with only patchy hill fog. Cloud bases may lower to 600 metres as the rain arrives around dusk. |
| Wind, temperature and freezing level / Gwynt, thymheredd a lefel rhewi Winds light or moderate northerly speeds 15 to 20 mph, becoming moderate southerly later speeds 20 to 25 mph. / Plus 3 becoming 5 Celsius / The freezing level will be above the tops. |
Outlook for Tuesday / Rhagolygon ar gyfer Dydd Mawrth
Cloudy with heavy rain at first and widespread hill fog, then becoming brighter and drier with cloud lifting and break. Winds brisk southerly at first, veering northwesterly later and moderating.
Outlook for Wednesday / Rhagolygon ar gyfer Dydd Mercher
Dry at first with a ground frost and mist and valley fog. Bright for a time, then cloud will increase with rain spreading from the south during the afternoon. Hill fog will become more widespread. Winds light at first, strengthening from the southeast later.
Outlook for Thursday / Rhagolygon ar gyfer Dydd Iau
Rain and low cloud will clear during the morning, then brighter with scattered showers during the afternoon. Winds strong southerly at first, then lighter westerly.
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