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Friday, 20 December 2013: dawn to dusk
Printable view Forecast issued: 0327 on Friday, 20 December 2013
Dry and cold start. Some bright or sunny spells and a few sleet and snow showers through morning. Increasing cloud into afternoon with heavy rain, transient snow, setting in and widespread upland gales or severe gales developing.
|Heavy snow||Low||Snow showers dying out through morning. Perhaps some transient snow very highest summits afternoon|
|Storm force winds||Medium||Gusts to 70-80mph for a time late afternoon and through the evening period across highest summits.|
|Gales||High||Widespread gales through afternoon and evening, leading to severe buffeting.|
|Severe chill effect||High||Temperatures will feel more like -10 degrees Celsius in exposure to wind.|
|Persistent and extensive hill fog||Medium||Occasional down to 700m through the morning. Becoming extensive above 500m with onset of rain.|
|Heavy persistent rain||High||Rain setting in by late afternoon, often heavy especially western hills.|
|Strong Sunlight||No Risk|
|Dawn to 0900||0900 to 1200||1200 to 1500||1500 to dusk|
Light snow showers
Dry and cold start, but with icy conditions underfoot, particularly across higher routes with the residual snow cover. Some bright or sunny spells and a few sleet and snow showers through morning above 600m. Increasing cloud into afternoon with heavy rain, and transient snow across very highest summits, setting in. Widespread upland gales or severe gales developing, with storm force gusts likely for a time leading to atrocious conditions with mobility severely hampered. Becoming very wet underfoot with marked thaw of lying snow across highest summits.
Generally good through the morning, but very poor in the snow showers. Becoming moderate to poor with the onset of the rain with temporary whiteout conditions across the highest summits in the snow. Visibilities very poor throughout in the hill fog.
Cloud bases varying considerably during morning with occasional spells of hill fog above 600m near and around showers, mainly across western hills. Cloud bases will thicken later in the afternoon with extensive hill fog developing down to 500m with the onset of the rain, highest bases across eastern hills.
Southwesterly 30-40mph, becoming 40-60mph through the afternoon with gusts to 70-80mph across summits and exposed ridges.
|Valleys||Minus 01 becoming 10 Celsius|
|800 m||Plus Zero becoming 5 Celsius|
|Freezing level||800m during morning, but patchy frost likely through the sheltered valleys at first. Progressively rising during afternoon and lifting well above the summits by late afternoon.|
A rather cloudy night with further outbreaks of rain at times and remaining windy. It will become brighter through the morning, However, showers will push in during the afternoon and become more frequent later. These showers will become heavy and merge into longer spells of rain at times. They will also turn to snow above across the summits later in afternoon and into the evening. Marked wind chill across exposed summits and ridges.
Generally good or very good, but becoming moderate to poor in showers and very poor in the hill fog throughout. Whiteout conditions likely in snow showers across the summits later.
Marked fluctuations in cloud bases throughout the day, with occasional patches down to 600m around showers and across western hills. The bases will occasionally clear summits intermittently; especially across eastern hills in the morning.
Southwesterly 30-40mph with gusts to 50mph.
|Valleys||Plus 4 becoming 9 Celsius|
|800 m||Plus 5 becoming 1 Celsius|
|Freezing level||Above the summits, but lowering through the afternoon and evening and becoming 900m|
Bright or sunny spells and blustery showers. It will be another very windy day with widespread gales, perhaps severe across highest summits and exposed ridges. Severe wind chill with the showers, which will fall as snow above 600m. Freezing level around the summits.
Becoming very wet and very windy on Monday with heavy, incessant and widespread severe upland gales, at times storm force, leading to horrendous conditions across the mountains. This rain may well clear to showers later in the day. Freezing level quickly lifting well above the summits during the morning.
Tuesday will be another windy day, but not as strong as Monday, with sunny spells and showers. The showers will progressively fall as snow above 500m as the day progresses. Freezing level lowering through the day, becoming 600m later in the day.
Altitude 353 metres
Rainfall measured at 03:00 Friday, 20 December 2013
Rainfall data provided by the Environment Agency. The Met Office is not responsible for content provided by third parties and may remove this data without warning.
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