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yellow Warnings have been issued for the United Kingdom

West Highlands

Weather hazards over 300m on Mon 27 Apr 2015

High risk

Severe chill effect
Steady gusts to 30mph with sub zero temperatures over the Munros, higher chill overnight in north.

Medium risk

Gales
Northern ranges overnight and Western coastal ranges may gust 50mph for a time.
Thunderstorms
Isolated lightning strikes possible, mainly mid-afternoon onwards.

Low risk

Persistent extensive hill fog
In prolonged showers in south later.
Strong sunlight
During the morning 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
Heavy persistent rain
none

Mon 27 Apr 2015

A very cold night for late April with widespread frost and icy surfaces developing over many hills, especially in north where drifted fresh snow. Snow showers will continue to affect ranges across Sutherland but elsewhere mainly dry with clearing skies. After dawn good sunny intervals and ranges from Torridon northwards will remain bright and mainly dry through the day. However in southern ranges snow and hail showers will develop after lunch, a few of these briefly heavy and they will be quite frequent over the Trossachs and Argyll hills later. On lowest slopes below 300metres showers will be of sleet. Ice will continue to be a hazard on higher north facing aspects above around 800 metres. The late evening will see patchy ice also re-developing on mid or lower slopes.

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
Partly cloudy night Partly cloudy night Sunny day Sunny intervals Light snow shower day Heavy snow shower day Light snow shower day Partly cloudy night
Precipitation probability
10-30% 10-30% 10% 10% 50-70% 50-70% 50-70% 10-30%

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 clearer conditions soon returning.

Hill Fog

Occasional patches 750 metres and then in snow showers becoming occasional 450 to 600 metres. Mid afternoon onwards across southern ranges occasional periods 450 to 600 metres.

Max wind above 600m

Overnight Northwest 30 gust 50mph in the north, otherwise gusts nearer 30mph, but near west coast such as Skye around middle of day becoming South 30 gust 50mph, then easing again later.

Temperature

Valleys:
Around minus 2 at dawn rising 7 Celsius daytime maximum.
800m:
Around Minus 2 Celsius
Freezing level:
Overnight 300metres occasionally down to mean sea level well inland from west coast till mid-morning, occasionally lifting 600 metres through the afternoon.

Issued at: 1656 on Sun 26 Apr 2015

Tue 28 Apr 2015

Clear spells overnight with some ice and just the odd snow shower in western ranges, then during the day further snow showers develop and they will become more frequent with generally cloudier skies and briefer sunny intervals. Showers heavy and locally thundery with hail. Snow settling over the Munros but showers of sleet on lowest slopes and in glens. 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

Patches 750 to 900 metres but near showers becoming occasional around 600 metres with patches lowering 450 metres in heavier snow showers, especially after midday in western ranges.

Max wind above 600m

West or Northwest 30 mph gusts 50mph

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 450 and 700 metres.

Issued at: 1656 on Sun 26 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 strong Southwesterly at first, more variable and lighter by afternoon, then a strengthening Northerly later.

Issued at: 1656 on Sun 26 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 and Argyll where some good sunny spells and often dry. North winds will be strong with high windchill and some patchy ice, mainly after dusk.

Issued at: 1656 on Sun 26 Apr 2015

Fri 01 May 2015

Still cold with North winds, but these easing and generally a good deal of dry bright weather with some sun. However there will still be some windchill and freezing levels will be around 400 metres in the north, lifting a little in south through the day. A few snow showers, mainly in the north with still some ice over the Munros.

Issued at: 1656 on Sun 26 Apr 2015