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yellow Warnings have been issued for the United Kingdom

West Highlands

Weather hazards over 300m on Tue 21 Oct 2014

High risk

Blizzards
Developing as snow showers pack in above 600 metres, temporarily severe at 900 metres.
Storm force winds
Widely gusting 75mph, occasional gusts around 90mph higher elevations. Danger of being blown over.
Gales
Continuous all day.
Severe chill effect
Developing quickly. Hypothermia in any exposure above 600 metres, potential frostbite over Munros.

Medium risk

Heavy snow
Showers will become heavy with seriously reduced visibility above 450 metres during showers.
Persistent extensive hill fog
Widespread but lifting and fragmenting during morning, some banks more persistent northwest slopes.
Heavy persistent rain
Overnight till dawn, dying out quickly, not expected by day with rain limited to lower slopes.

Low risk

Thunderstorms
Just possible, mainly coastal northern ranges.

No risk

Strong sunlight
none

Tue 21 Oct 2014

Overnight heavy rain, with some shortlived sleet over Munros, clearing before dawn then after sunrise a brighter picture with brief sunny intervals and frequent snow showers, some heavy. The snow showers will fall above around 450 metres with temporary blizzard conditions over the higher slopes, severe over the Munros as the showers move through. Showers of hail or sleet on lower slopes. Best of sunny intervals over the Trossachs. The showers will tend to ease through the evening though icy surfaces may develop after dark.

Time
0600 to 0900 0900 to 1200 1200 to 1500 1500 to 1800 1800 to 2100 2100 to 2400
Weather
Hail shower day Heavy snow shower day Heavy snow shower day Heavy snow shower day Light snow shower night Light snow shower night
Precipitation probability
50-70% 70-90% 70-90% 50-70% 50-70% 50%

Visibility

Mostly poor overnight and occasionally very poor in heavy rain, summit sleet and hill fog. Improving very good around dawn but frequent rapid reductions to very poor as showers move through and occasionally near zero visibility in heavier snow showers, especially above 600 metres. Disorientation highly likely over the Munros where hill fog more prevalent.

Hill Fog

Extensive 300 to 600 metres overnight, lifting and fragmenting to periods 600 to 750 metres through the morning. In showers some banks lowering 450 metres. Northwest facing slopes seeing lowest bases. Between showers, on southern ranges in particular later in day, occasionally just patches 900 metres.

Max wind above 600m

Northwest 60 gust 75 to 90mph.

Temperature

Valleys:
Plus Averaging 7 Celsius, but 10 Celsius briefly in the south during any sunny glimpses. Celsius
800m:
Plus zero falling minus 1. Celsius
Freezing level:
around 900 metres falling 600 metres.

Issued at: 0314 on Tue 21 Oct 2014

Wed 22 Oct 2014

Despite a bright start in some inland ranges thick cloud and plenty rainfall over western coastal ranges will spread east to all parts by noon. Rain heaviest over western slopes during the afternoon and evening. Thaw of any fresh snow drifts in corries and becoming very wet underfoot with mist and hill fog.

Visibility

Good inland reducing moderate then poor as rain sets in, then very poor or fog as cloud and mist descends.

Hill Fog

Occasional 600 to 900 metres, descending and becoming extensive 300 to 450 metres by afternoon, some banks 150 metres on west facing slopes later.

Max wind above 600m

West 30 gust 45mph increasing 50 gust 70mph.

Temperature

Valleys:
plus 5 rising 12 Celsius.
800m:
plus 1 rising plus 6 Celsius.
Freezing level:
Near summits at dawn in east, at around 1100 metres, but soon rising well above summits.

Issued at: 0314 on Tue 21 Oct 2014

Thu 23 Oct 2014

Westerly gales slowly abate but still with gusts 50mph. Starting with mostly cloudy rainy conditions, the rain heaviest over Argyll, with widespread hill fog; however drier conditions spreading from the north later, perhaps much brighter over the Northwest Highlands to end the day. Staying mild.

Issued at: 0314 on Tue 21 Oct 2014

Fri 24 Oct 2014

A weather front should remain well to the south over England so a bright day with just a few showers and some good sunny intervals. Strong Southwest winds, possible gales on summits, and becoming cooler with freezing levels perhaps lowering to 1100 metres in the north, so some sleet or snow flurries northern Munros later. Windchill developing on summits in north.

Issued at: 0314 on Tue 21 Oct 2014

Sat 25 Oct 2014

Bright with sunny spells and passing showers. The showers mainly in the north where some heavy and falling as snow over the very highest Munros. Freezing level around 1200 metres with medium windchill in the strong West to Southwest wind.

Issued at: 0314 on Tue 21 Oct 2014