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Friday, 19 March 2010: dawn to dusk
A cloudy but mostly dry morning, although a bit misty and drizzly in the south. Rain spreading from the southwest during the afternoon.
| Hazards | Risk | Explanation |
|---|---|---|
| Blizzards | No Risk | |
| Heavy snow | No Risk | |
| Storm force winds | No Risk | |
| Gales | Low | Gusts may just reach gale force around peaks and ridges towards the end of the day. |
| Severe chill effect | No Risk | |
| Persistent and extensive hill fog | High | Hill fog likely in association with rain and also in southern parts of the park during the morning. |
| Thunderstorms | No Risk | |
| Heavy persistent rain | Medium | Rain likely to be fairly persistent towards the end of the afternoon. |
| Dawn to 0900 | 0900 to 1200 | 1200 to 1500 | 1500 to dusk |
![]() Cloudy |
![]() Cloudy |
![]() Cloudy |
![]() Heavy Rain |
| 30% | 20% | 40% | 80% |
A mostly dry but cloudy start to the day in the Brecon Beacons, with a risk of drizzle on some southern slopes. Then staying similar for much of the day, although rain is expected to spread from the southwest during the second half of the afternoon.
Generally good during the day, although poor in drizzle and very poor in hill fog. Becoming moderate in rain later.
Periods of hill fog at all levels in the south at first, becoming occasional above 500 metres during the morning. Again, periods above about 200 metres towards the end of the afternoon as rain approaches.
South or southwest 25-35 mph, becoming southeast 40-50 mph later.
| Valleys | Plus 10 Celsius. |
| 800 m | Plus 5 Celsius. |
| Freezing level | Above the summits. |
Another cloudy day with outbreaks of rain both morning and afternoon, along with some drier intervals in between. The rain is unlikely to be constant but could be heavy at times, particularly on south or southwest-facing upslopes.
Generally moderate, but occasionally poor in heavier rain and very poor in hill fog.
Periods of hill fog above about 200 metres.
Southwesterly 30-35 mph.
| Valleys | Plus 10 Celsius. |
| 800 m | Plus 6 Celsius. |
| Freezing level | Above the summits. |
Rain clearing early to leave a mostly dry day, although staying rather cloudy. One or two showers remain likely with brisk southwesterly winds.
Staying mild and damp, with rain and a good deal of low cloud likely. Moderate southerly winds will turn westerly through the day.
Remaining unsettled and mild, with further rain or showers and moderate westerly winds.
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