Brecon Beacons mountain area forecast
Forecast issued: 0734 on Thursday, 23 May 2013
Overview for Thursday
Cold and windy with scattered showers developing.
High risk of Severe chill effect: Strong winds will combine with low temperatures to give a severe chill effect.
Medium risk of Gales: Northwesterly winds may reach gale force over the highest summits.
Medium risk of Thunderstorms: Showers may be heavy at times with a risk of hail and thunder
Medium risk of Strong sunlight: Risk of sunburn in any lengthy sunny spells between showers.
No risk of Blizzards; Heavy snow; Storm force winds; Persistent extensive hill fog; Heavy persistent rain;
Weather summary and probability of precipitation for Thursday
|Dawn to 0900||Sunny intervals||20% chance of precipitation|
|0900 to 1200||Light rain showers||40% chance of precipitation|
|1200 to 1500||Light rain showers||70% chance of precipitation|
|1500 to dusk||Light rain showers||70% chance of precipitation|
Detailed mountain weather forecast
A much windier day and feeling cold, especially at height where temperatures will be low. After a bright start with some sunshine and isolated showers, the showers will become more frequent by afternoon with perhaps the odd heavy one, with the risk of hail and thunder. There is a risk of showers turning wintry above 800 metres. Winds will strengthen, perhaps reaching gale force over exposed ridges and summits during the afternoon.
Generally very good or excellent, but moderate in showers.
Maximum winds above 400m
NW 50 mph during the afternoon.
Valleys: Plus 4 Celsius rising to plus 10 Celsius.
800 m: Zero Celsius rising to plus 2 Celsius.
Freezing level: 800 metres.
Very windy with north or northwesterly gales possible at lower levels, becoming northeasterly later. It will also be rather cloudy with outbreaks of rain or showers and occasional hill fog above around 700 metres. The freezing level will be around 800 metres initially so some of the rain could turn wintry. Some bright spells developing later but with showers too.
Generally good but moderate in rain or showers, becoming very good between showers later.
Occasional hill fog above 700 metres especially over north facing hills, but tending to lift clear during the afternoon between showers.
Maximum winds above 400m
NW 40-45 mph becoming NE later.
Valleys: Plus 4 Celsius rising to plus 11 Celsius.
800 m: Zero Celsius rising to plus 4 Celsius.
Freezing level: 800 metres rising above the summits by afternoon.
Conditions much better than on Friday with lighter winds and some decent sunny spells. It will be a chilly start with some mist and fog patches in the valleys, but these will soon clear to leave a dry day and with the sunshine it will feel much warmer than previous days.
After another chilly start with some mist and fog patches it will be a mostly dry day with some bright or sunny spells and light or moderate northwesterly winds. Turning cloudier later.
Cloudy and breezy with outbreaks of rain arriving later, becoming persistent and heavy at times with occasional hill fog. Significant wind chill developing in the wind and rain.