Digital Map Data:
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Wednesday, 18 December 2013: dawn to dusk
Printable view Forecast issued: 0410 on Wednesday, 18 December 2013
Mostly cloudy with outbreaks of rain and summit snow, but drier, brighter for a time in north. Heavy rain in evening followed by snow showers. Severe gales or storm force winds.
|Blizzards||Low||Persistent snow early hours. Snow showers later in the evening with very strong winds.|
|Heavy snow||Low||Persistent snow early hours. Snow showers will develop later in the evening above 600 metres|
|Storm force winds||High||Severe gales expected throughout but storm force winds in early hours then during the evening.|
|Gales||High||Widespread over high ground.|
|Severe chill effect||Medium||Severe gale or storm force winds, summits just above freezing, but well below freezing late evening|
|Persistent and extensive hill fog||Medium||Persistent fog above 600m, mainly in the south.|
|Heavy persistent rain||High||Persistent rain in the early hours then heavy persistent rain arrives during the evening.|
|Strong Sunlight||No Risk|
|Dawn to 0900||0900 to 1200||1200 to 1500||1500 to dusk|
During the early hours a band of rain, with snow above 600 metres will clear eastwards. Drier conditions will follow for the Northern Cairngorms, with some brightness at times. However, more southern areas including Ben Lawers, Southern Cairngorms and Angus Hills will remain cloudy with outbreaks of rain, with snow on Munro tops. A very windy day with widespread gales or severe gales. During the evening, heavy rain and summit snow will spread quickly east followed by snow showers above 600m. Winds will also strengthen significantly over high ground with gusts over 90mph expected later.
Generally poor at first in the rain and hill snow but becoming mostly moderate or good during the day. Becoming generally poor in the evening when the heavy rain and summit snow arrives followed by snow showers.
Persistent above 600 metres, especially across southern ranges, but more patchy across the Northern Cairngorms. Becoming persistent above 400 metres during the evening.
Southerly mean 60mph with gusts 80mph in early hours then 45-50mph gusting 70mph in daylight hours, increasing to southwesterly mean 60mph gusts 90mph in evening.
|Glens||Plus 1 rising to 8 Celsius, dropping to Plus 2 Celsius later in evening.|
|900 m||Minus 1 rising to Plus 2, dropping to Minus 1 Celsius later.|
|Freezing level||600 metres rising to 1100 metres by dawn, falling to 700 metres during the evening.|
Bitterly cold with frequent snow showers, some perhaps with hail and thunder. Snow levels will drop to 300m, even lower at times, with drifting of snow over higher ground. There will be some sunshine between the showers, mainly Eastern Cairngorms and Angus Hills. Severe gale force winds coupled with sub-zero temperatures will give make progress difficult over high ground with a severe wind chill.
Mainly poor or very poor as the snow showers pass over, with sudden improvements between showers. Good for longer periods over Eastern Cairngorms and Angus.
Occasional hill fog above 600 metres, occasionally falling to 400 metres or lower in showers.
West or southwesterly 50mph gusts 80mph, but gusts over 100mph in the early hours.
|Glens||Plus 3 Celsius dropping to Minus 3 Celsius after dark.|
|900 m||Minus 4 Celsius.|
|Freezing level||300 metres.|
Snow showers during the morning, these mainly in the west, but most eastern areas will get some sunshine. Cloud, rain and hill snow will spread from the west during the afternoon. This will clear east by late evening to bring a cold, showery night. Severe gales continuing.
Another very windy day with severe southwesterly gales or storm force winds. Frequent and Snow showers continue to push in from the west, but eastern ranges seeing plenty of bright or sunny spells. A cold day with a significant wind chill.
Similar to Saturday with freezing temperatures and frequent snow showers. Eastern areas again seeing the best of the brightness. Severe gale or storm force westerly winds.
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