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Brecon Beacons: latest pressure
Saturday, 21 November 2009: dawn to dusk
Overview for Saturday
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.
| Hazards | Risk | Explanation |
|---|---|---|
| Blizzards | No Risk | |
| Heavy snow | No Risk | |
| Storm force winds | No Risk | |
| Gales | High | Southerly winds strengthening to reach gusts of over 50 mph this morning. |
| Severe chill effect | No Risk | |
| Persistent and extensive hill fog | High | Hill fog is likely to become extensive above 300 metres this morning, rising to 600 metres. |
| Thunderstorms | No Risk | |
| Heavy persistent rain | High | Rain is likely to be heavy and persistent from late morning. |
| Dawn to 0900 | 0900 to 1200 | 1200 to 1500 | 1500 to dusk |
 Light rain |
 Heavy Rain |
Heavy Rain |
Heavy Rain |
| 60% | 80% | 90% | 90% |
Detailed mountain weather forecast: Brecon Beacons
Saturday
Weather
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
Moderate or poor for much of the day in rain and very poor in hill fog.
Hill fog
Occasional 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.
Maximum winds above 400m
Wind gusting 50 to 60 mph this afternoon above 600 metres.
Temperature
| Valleys | Plus 13 Celsius. |
| 800 m | Plus 9 Celsius. |
| Freezing level | Well above the summits. |
Sunday
Weather
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
Moderate or good but occasionally poor in heavier showers and very poor in hill fog.
Hill fog
Occasional above around 600 metres with patches at 400 metres in heavier showers.
Maximum winds above 400m
Wind gusts 60 to 70 mph likely at times above around 600 metres.
Temperature
| Valleys | Plus 10 to plus 12 Celsius. |
| 800 m | Plus 7 Celsius. |
| Freezing level | Well above the summits. |
Outlook
Monday
Unsettled with further showers or perhaps some longer spells of rain. Strong to gale force westerly winds. Occasional hill fog.
Tuesday
Continuing unsettled with further showers or perhaps some longer spells of rain. Strong to gale force westerly winds. Occasional hill fog.
Wednesday
Another unsettled and windy day with occasional blustery showers and occasional hill fog.
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