Brecon Beacons mountain area forecast
Forecast issued: 1719 on Thursday, 9 February 2012
Overview for Friday
Rain, sleet and snow during the morning should slowly clear westwards. Largely dry in the afternoon with some brighter periods but staying cold.
Hazards
High risk of Severe chill effect: High risk of a severe wind chill throughout the day.
High risk of Persistent extensive hill fog: Extensive hill fog to low levels during the morning, lifting and breaking by afternoon.
Low risk of Heavy persistent rain: Persistent rain in the morning may become heavy at times.
No risk of Blizzards; Heavy snow; Storm force winds; Gales; Thunderstorms; Strong sunlight;
Weather summary and probability of precipitation for Friday
| Dawn to 0900 |  |
Heavy snow | 80% chance of precipitation |
|---|---|---|---|
| 0900 to 1200 |  |
Sleet | 70% chance of precipitation |
| 1200 to 1500 |  |
Light rain | 40% chance of precipitation |
| 1500 to dusk |  |
Sunny intervals | 0% chance of precipitation |
Detailed mountain weather forecast
Friday
Weather
After a cloudy start with rain, sleet and snow likely the weather will slowly improve during the day. Sleet and snow are likely to all levels in the morning, with significant accumulations possible on high ground across the Brecon Beacons. It will slowly become drier and brighter from the east during the day, with most parts dry by afternoon. It will however remain cold, with temperatures not rising above freezing even at low levels.
Visibility
Very poor in fog, and moderate to poor in rain and snow during the morning. Becoming good in the afternoon as rain clears.
Hill fog
Extensive hill fog to the valley floors at first, this lifting and breaking with periods of hill fog above 700 metres in the afternoon.
Maximum winds above 400m
Southeasterly 30 mph
Temperature
Valleys: Between minus 2 Celsius and plus 1 Celsius
800 m: Minus 1 Celsius falling to minus 4 Celsius by evening.
Freezing level: Between sea-level and 100 metres.
Saturday
Weather
Chance of some valley fog at first, but once this clears it will be a largely dry but very cold day across the Brecon Beacons. Temperatures will be well below freezing at first and will only slow rise to just above freezing in the afternoon. As a result, there is likely to be widespread ice which could prove challenging unless adequately equipped. Although generally sunny, there is a chance of a little cloud in the afternoon.
Visibility
Excellent.
Hill fog
Nil.
Maximum winds above 400m
Southeasterly 20 mph
Temperature
Valleys: Minus 2 Celsius to plus 1 Celsius.
800 m: Minus 3 Celsius
Freezing level: Between sea-level and 100 metres.
Outlook
Sunday
Generally rather cloudy with hill fog affecting the peaks. Chance of a little light rain, this perhaps falling as sleet or snow over the higher parts of the National Park with the freezing level down to 700 metres.
Monday
A similar day to Sunday, with fairly widespread cloud and occasional rain, this falling as sleet or snow at height. The freezing level will again be around 700 metres. Chance of gale force northwesterly winds in the afternoon.
Tuesday
A cold day with temperatures struggling to rise above freezing. There may be a few showers, with these falling as snow above 300 metres. Strong to gale force northerly winds will affect the summits.
