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West Highlands

Weather hazards over 300m on Sun 26 Apr 2015

High risk

Severe chill effect
Steady gusts to 40mph with sub zero temperatures over the Munros, lower wind-chill mid slopes.

Medium risk

No medium risks
none

Low risk

Gales
Isolated gusts around 50mph across the northwestern Munros.
Thunderstorms
Isolated lightning strikes possible, mainly up until late afternoon.
Strong sunlight
During the day some strong sunshine at times and also glare off any fresh snow higher slopes.

No risk

Blizzards
none
Heavy snow
none
Storm force winds
none
Persistent extensive hill fog
none
Heavy persistent rain
none

Sun 26 Apr 2015

Overnight a band of snow and hail showers will move south across the northern Highlands through Torridon, Skye and then most other ranges. A few of the showers will be briefly heavy with fresh cover of snow down to as low as 300 metres. Some clear spells between showers with patchy ice. After sunrise some good dry bright spells with some sunny intervals but there will be snow and hail showers scattered around, a few of these briefly heavy. In valleys showers will be of sleet. Ice will continue to be a hazard on higher north facing aspects above around 800 metres. The evening will be largely dry and sunny then clear after dark with patchy ice developing.

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 Light snow shower night Light snow shower day Light snow shower day Hail shower day Light snow shower day Sunny day Partly cloudy night
Precipitation probability
60% 30-50% 30-50% 30-50% 60% 10-30% 10% 10%

Visibility

Excellent with distant peaks clearly visible. However during hail and snow showers quickly reducing poor, briefly very poor. Above around 600 metres, and especially over snow covered Munros, very brief white out conditions during any heavier snow showers where combined with hill fog, but generally shortlived with clear conditions soon returning.

Hill Fog

Overnight in snow showers, mainly in north, occasional cover 450 to 600 metres, otherwise patches 750 to 900 metres. After dawn occasional banks 750 metres and then in snow showers temporary periods 450 to 600 metres. Mostly dispersing during early evening.

Max wind above 600m

Northwest 25 or 30mph gust 40mph, but 35 gust 50mph in exposed parts of the northwest.

Temperature

Valleys:
Around zero rising 7 Celsius daytime maximum.
800m:
Around Minus 2 Celsius
Freezing level:
300 metres, locally at all levels inland at dawn, occasionally lifting 600 metres through the afternoon.

Issued at: 1726 on Sat 25 Apr 2015

Mon 27 Apr 2015

Clear overnight till dawn with frost and some ice, then during the day further snow showers develop, these becoming more frequent with generally cloudier skies and briefer sunny intervals. Showers heavy and locally thundery with hail. Snow settling over the Munros and drifting in strong winds but showers of sleet on lowest slopes and in glens. Temporary slushy snow settling down to around 500 metres. Over Munros some white out conditions with hazardous winter type conditions during snow showers.

Visibility

Excellent outwith snow showers with clear views across the Highlands. However during snow showers rapid reductions to poor, briefly some disorientation when heavier showers pass through where combined with hill fog, but mostly short lived.

Hill Fog

Little overnight through to early morning, then occasional cover 750 to 900 metres developing and near showers periods 600 metres and occasional banks lowering 450 metres in snow showers

Max wind above 600m

Direction rather variable, mainly south then later West, 30 gust 45mph, but 40 gust 60mph possible in west.

Temperature

Valleys:
minus 1 rising plus 7 Celsius daytime maximum.
800m:
Around Minus 2 Celsius with added wind chill.
Freezing level:
All levels inland at dawn then fluctuating between 300 and 500 metres.

Issued at: 1726 on Sat 25 Apr 2015

Tue 28 Apr 2015

Similar with another wintry day with further snow showers, some heavy with isolated thunderstorms and hailstones. Showers of rain and sleet lower slopes and valleys. Brief sunny intervals. Strong West wind gust 40 to 50mph with high wind chill and further drifting of fresh snow on higher slopes. Freezing level around 400 lifting to nearer 700 metres. Ice risk continues on Munros, with north facing slopes most prone.

Issued at: 1726 on Sat 25 Apr 2015

Wed 29 Apr 2015

Very changeable with the wintry shower theme being temporary halted as a frontal depression runs eastwards across southern Scotland and England. Freezing levels lift to around 700 metres so any snow showers more restricted to above mid mountain, and more likely in north. Winds mostly fresh or strong Southwesterly, more variable later.

Issued at: 1726 on Sat 25 Apr 2015

Thu 30 Apr 2015

A return of cold showery North or Northwest airflow with freezing levels lowering back to 500 metres with northern ranges catching snow showers, some heavy. Best of brighter weather across Trossachs. North winds may touch gale force over summits with high windchill and some patchy ice, mainly after dusk.

Issued at: 1726 on Sat 25 Apr 2015