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yellow Warnings have been issued for the United Kingdom

West Highlands

Weather hazards over 300m on Sun 21 Dec 2014

High risk

Storm force winds
Throughout, with gusts 80-100mph likely.
Gales
Throughout and often to lower levels.
Severe chill effect
Combination of extreme winds, rain, and some sub-zero temperatures early hours and late evening.
Persistent extensive hill fog
Risk only decreasing during the evening in northwest.
Heavy persistent rain
Incessant heavy rain and snowmelt leading to swollen water courses and some flooded access roads.

Medium risk

No medium risks
none

Low risk

No low risks
none

No risk

Blizzards
none
Heavy snow
none
Thunderstorms
none
Strong sunlight
none

Sun 21 Dec 2014

Some patchy light rain and summit snow around midnight though very quickly turning to rain even on summits. Then heavy and persistent rain overnight and throughout daylight hours on Sunday. Some significant snowmelt is expected so watercourses will be running high and some access roads may become flooded. It will finally turn more showery in the Northwest Highlands in the evening and all except Argyll and the Trossachs by midnight. Showers in the north will turn to snow.

Time
0000 to 0300 0300 to 0600 0600 to 0900 0900 to 1200 1200 to 1500 1500 to 1800 1800 to 2100 2100 to 2400
Weather
Heavy rain Heavy rain Heavy rain Heavy rain Heavy rain Heavy rain Heavy rain Sleet shower night
Precipitation probability
80% 100% 100% 100% 100% 100% 90% 50%

Visibility

Moderate to poor.

Hill Fog

Fairly extensive hill fog down to 450-600m and locally to 300m near the west coast, becoming more occasional 600-750m in the northwest in the evening.

Max wind above 600m

West to southwest 60-70mph gusts 100mph.

Temperature

Valleys:
Plus 6 Celsius rising to Plus 10 Celsius in the morning edging down to Plus 6 during the evening.
800m:
Plus 2 Celsius at midnight rising Plus 5 in early hours, dropping to Plus 3 Celsius by late evening but down to Minus 1 in the far north.
Freezing level:
1100m at midnight quickly rising above summits in early hours, remaining there until mid evening then dropping back down to 1100m in south and 600m in far north by midnight.

Issued at: 1716 on Sat 20 Dec 2014

Mon 22 Dec 2014

Clear or sunny intervals and showers. These will be of snow down to about 300m in the north and 600m in the south.

Visibility

Mostly very good but poor locally in showers.

Hill Fog

Occasional at 600-750m with patches 450m in showers.

Max wind above 600m

Westerly 50 gusts 75mph.

Temperature

Valleys:
Down to Plus 2 Celsius by dawn rising Plus 6 in the day though dipping in showers and falling to 2 after dark.
800m:
0 Celsius.
Freezing level:
500m in north 800m in south.

Issued at: 1716 on Sat 20 Dec 2014

Tue 23 Dec 2014

Clear or sunny intervals and showers these of snow above 600m. Strong to gale westerly winds.

Issued at: 1716 on Sat 20 Dec 2014

Wed 24 Dec 2014

Clear or sunny intervals and occasional showers these of snow above 400m and wintry a little lower. Strong to gale westerly winds.

Issued at: 1716 on Sat 20 Dec 2014

Thu 25 Dec 2014

Cold strong northerly winds will bring some snow showers to the northern ranges, with some sunny intervals in between, while much of the south stays dry with some sunshine.

Issued at: 1716 on Sat 20 Dec 2014