Forecast
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Brecon Beacons: forecast uv
Sunday, 22 November 2009: dawn to dusk
Overview for Sunday
A brighter day, but very windy with strong to gale-force winds throughout, together with frequent, occasionally heavy showers.
| Hazards | Risk | Explanation |
|---|---|---|
| Blizzards | No Risk | |
| Heavy snow | No Risk | |
| Storm force winds | High | Southwesterly, gusts up to 60 mph, with the risk of 70 mph over 600m. |
| Gales | High | Southwesterly, gusts up to 60mph likely, particularly on exposed ridges. |
| Severe chill effect | High | In showers and especially above 700m |
| Persistent and extensive hill fog | Low | Occasional patches of hill fog, in and around showers above 600m. |
| Thunderstorms | Low | Low risk of thunder and lightning in any of the heavier showers. |
| Heavy persistent rain | Low | Low risk of heavy showers merging together to form longer periods of rain during the afternoon. |
| Dawn to 0900 | 0900 to 1200 | 1200 to 1500 | 1500 to dusk |
 Heavy rain showers |
Heavy rain showers |
Heavy rain showers |
Heavy rain showers |
| 50% | 60% | 70% | 90% |
Detailed mountain weather forecast: Brecon Beacons
Sunday
Weather
Brighter but remaining very windy with strong to gale- force winds together with frequent showers, some heavy. Largely cloudy but some brief sunshine can be expected in between the showers.
Visibility
Generally moderate to good, but poor in heavy showers and very poor in any hill fog.
Hill fog
Occasional patches above around 700 metres.
Maximum winds above 400m
Southwest 45 to 55 mph gusting 60-70 mph.
Temperature
| Valleys | Plus 9 Celsius |
| 800 m | Plus 3 Celsius |
| Freezing level | Well above peaks. |
Monday
Weather
Another windy day with strong westerly winds. Cloudy with showery rain at first, possibly heavy at times, becoming brighter and drier with more in the way of sunny spells later.
Visibility
Generally moderate or good, but occasionally poor in rain or showers and very poor in any hill fog.
Hill fog
Occasional patches above 600 metres.
Maximum winds above 400m
Westerly 30 to 40 mph gusting 50 mph.
Temperature
| Valleys | Plus 8 Celsius |
| 800 m | Plus 2 Celsius |
| Freezing level | Well above the summits. |
Outlook
Tuesday
Remaining unsettled with more strong to gale-force southwesterly winds, and some spells of persistent, heavy rain. Periods of hill fog are likely.
Wednesday
Very windy with strong to gale-force west or southwesterly winds, and further heavy showers throughout the day. Occasional patches of hill fog.
Thursday
Winds easing but still remaining unsettled with scattered showers and variable amounts of cloud. Occasional hill fog.
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