Issued 1745 Friday, 09 January 2009
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Cyhoeddwyd 1745 Dydd Gwener, 09 Ionawr 2009
 Sunrise / Codiad Haul : 0817 , Sunset / Machlud Haul : 1624
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Hazards / Peryglon
Fog. Gales. Wind chill. Ice. |
Forecast for daylight hours for Saturday / Rhagolwg ar gyfer oriau'r dydd Dydd Sadwrn
| General situation / Sefyllfa cyffredinol South Wales will remain under the influence of high pressure for one more day. However, the settled weather will come to an end as fronts track down from the northwest. | ||
| Weather / Tywydd A foggy or misty start to the day. As the morning progresses most of the fog should disperse from the valleys to allow some hazy sunshine, although some freezing fog patches may persist across the east. | ||
| Visibility / Gwelededd Moderate or good, but poor in fog. | ||
| Cloud base / Gwaelod y cymylau From the surface to 450m, this thinning through the morning. | ||
| Wind / Gwynt | Temperature / Thymheredd | |
| 300m | South or Southwest 10 increasing 25mph. | 0C increasing 4C. |
| 500m | Southwest 15 increasing 30mph gusts 40mph leading to a significant wind chill. | 0C increasing 3C. |
| 800m | Southwest 25mph increasing 35mph gusts 45mph leading to a significant wind chill. | 1 or 2C. |
| Freezing level / Lefel rhewi Most levels first thing, rising above the summits. | ||
Forecast for daylight hours for Sunday / Rhagolwg ar gyfer oriau'r dydd Dydd Sul
| Weather / Tywydd Bright with hazy sunshine, although the south and west of the Park may see more in the way of cloud. |
| Visibility and cloud base / Gwelededd a gwaelod y cymylau Good / Well broken or broken 750m. |
| Wind, temperature and freezing level / Gwynt, thymheredd a lefel rhewi Southwest 50mph gusts 70mph leading to a significant wind chill / 4C / Above the summits. |
Outlook for Monday / Rhagolygon ar gyfer Dydd Llun
Widespread hill fog with rain. Strong winds or gales easing across the summits. Significant wind chill. The freezing level will remain above the summits.
Outlook for Tuesday / Rhagolygon ar gyfer Dydd Mawrth
Bright or sunny spells with the small chance of seeing a heavy shower. Lighter winds, than of late. The freezing level will remain above the summits.
Outlook for Wednesday / Rhagolygon ar gyfer Dydd Mercher
Strengthening southwest winds will bring hill fog and rain. Significant wind chill. The freezing level will remain above the summits.
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