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yellow Warnings have been issued for the United Kingdom

West Highlands

Weather hazards over 300m on Sat 20 Dec 2014

High risk

Storm force winds
Overnight and morning, gusts 80-90mph.
Gales
Throughout on summits, and to some lower levels overnight and morning.
Severe chill effect
Severe gales and sub-zero temperatures combining.

Medium risk

Blizzards
Temporary in snow showers overnight and morning.

Low risk

Thunderstorms
Mainly in the pre-dawn period.
Strong sunlight
Glare from sun shining on fresh snow cover.

No risk

Heavy snow
none
Persistent extensive hill fog
none
Heavy persistent rain
none

Sat 20 Dec 2014

Further snow showers continuing overnight and into the morning, some heavy and with blizzard conditions at times due to the severe gales. The showers becoming more isolated during the day with more in the way of sunny intervals though high cloud will increase later with some lighter showers continuing towards the west coast. Then more persistent rain and hill snow arriving during the evening.

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 snow shower night Heavy snow shower night Heavy snow shower night Light snow shower day Sunny intervals Cloudy Light snow Light snow
Precipitation probability
70% 70% 60% 40% 20% 30% 40% 60%

Visibility

While the airmass will be generally clear with good visibility there will be rapid deteriorations in snow showers to poor or very poor and blizzard conditions will cause spells of zero visibility overnight and at first on Saturday. In the afternoon visibility should be very good with distant snow covered peaks clearly seen. Falling modeate to poor in the evening.

Hill Fog

Occasional 600-750m in snow showers with a few lower patches in the west and north. Patchy in the afternoon. Then becoming widespread in the evening with patches to 450m on the west coast.

Max wind above 600m

Westerly 65 gusts 90mph veering more northwesterly overnight, easing 35 gusts 55mph during the afternoon then westerly 40 gusts 50 in the evening, increasing southwest 50 gusts 70mph by midnight.

Temperature

Valleys:
Near 0 Celsius overnight and early Saturday, rising to Plus 6 Celsius in the afternoon, falling back to Plus 3 in the evening.
800m:
Minus 3 Celsius.
Freezing level:
All levels overnight picking up to 400m during the day, and 700m later in the evening.

Issued at: 1745 on Fri 19 Dec 2014

Sun 21 Dec 2014

Occasional snow in the early hours will turn to rain and become persistent and heavy, with significant snowmelt. Drier colder weather will edge in from the north during the afternoon and evening though any following showers will turn back to snow on the tops.

Visibility

Moderate to good falling poor in the west.

Hill Fog

Extensive above 450-600m and falling 300m at times near the west coast during rain. Becoming less extensive in north later.

Max wind above 600m

Southwesterly 70 gusts 100mph overnight and morning then westerly 60 gusts 85mph in afternoon and evening.

Temperature

Valleys:
Plus 3 Celsius at midnight rising to Plus 9 Celsius during the morning falling to 5 Celsius in the evening though 7 in the south.
800m:
Minus 2 Celsius at midnight rising Plus 5 Celsius by daybreak, edging down to Plus 2 in the south and Minus 1 in the north during the evening.
Freezing level:
500m at midnight lifting above summits by early hours falling down to 1000m in south and 750m in north during the evening.

Issued at: 1745 on Fri 19 Dec 2014

Mon 22 Dec 2014

More persistent rain and summit snow returning north for a time before clearing to blustery and increasingly wintry showers in the afternoon and evening. Freezing levels 900m falling 600m, though may briefly rise above summits should a warm front push further north during the middle part of the day. Severe gale to storm force westerly winds.

Issued at: 1745 on Fri 19 Dec 2014

Tue 23 Dec 2014

Clear or sunny spells and snow showers these most frequent in the northwest. Gale to severe gale westerly winds and freezing levels around 600m.

Issued at: 1745 on Fri 19 Dec 2014

Wed 24 Dec 2014

Still cold with some snow showers but becoming more isolated as the winds decrease. Freezing level 600m.

Issued at: 1745 on Fri 19 Dec 2014