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West Highlands

Weather hazards over 300m on Mon 20 Feb 2017

High risk

Gales
Over higher ground throughout
Severe chill effect
Becoming significant from late afternoon onwards.
Persistent extensive hill fog
Overnight and on Monday morning, clearing later.

Medium risk

Storm force winds
Across the tops.

Low risk

No low risks
none

No risk

Blizzards
none
Heavy snow
none
Thunderstorms
none
Heavy persistent rain
none
Strong sunlight
none

Mon 20 Feb 2017

Cloudy overnight and into Monday morning with outbreaks of rain, heavy at times across the northwest. This will clear through the late morning with drier and brighter weather to follow by early afternoon with sunny spells and a few showers mainly in north. These will turn wintry above 600m. It will be windy with severe gales on the tops resulting in very difficult walking conditions. Also temperatures falling below freezing later in the day with wind-chill effect becoming severe.

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 Sunny intervals Light snow shower day Cloudy Cloudy
Precipitation probability
70-90% 70-90% 70-90% 50-70% 30-50% 30-50% 30-50% 30-50%

Visibility

Moderate or poor in rain overnight and into the morning, becoming very good away from showers later in the day.

Hill Fog

Extensive hill fog overnight and on Monday morning above about 500M, lifting and dispersing by the afternoon, many hill-tops becoming fog-free.

Max wind above 600m

Very strong westerly winds, average speeds on the tops of 50 to 60mph and gusts 80mph.

Temperature

Valleys:
Plus 6 Celsius rising to 10 Celsius.
800m:
Plus 5 Celsius falling later in the day to minus 1 Celsius.
Freezing level:
Well above the summits, lowering to 700M on Monday evening.

Tue 21 Feb 2017

Mostly cloudy overnight and into Tuesday morning with scattered showers (wintry above 600m) with drier conditions elsewhere. Increasingly cloudy in the afternoon with rain this heavy in places. Rain will clear later in the evening with scattered wintry showers following in northwest. Remaining windy with westerly gales, becoming severe over higher ridges/summits in the evening.

Visibility

Moderate or poor in wintry showers, otherwise good or very good. Becoming moderate in rain through the afternoon.

Hill Fog

Occasional at 700m mainly in west overnight and into Tuesday morning. Becoming extensive at 500m mainly in west and south but well scattered at 700m elsewhere. Occasional patches at 500m in showers later in the evening.

Max wind above 600m

West-southwest 40mph gusting 55mph. By midnight gusts of 65mph are expected across the northern ranges.

Temperature

Valleys:
Minus 1 Celsius rising to around plus 10 Celsius in the afternoon.
800m:
Around zero in the morning, rising to plus 3 Celsius in the afternoon. Dropping again down to zero later in the evening.
Freezing level:
Around 800m, rising above all summits in the afternoon. Dropping down to 600m later in the evening.

Wed 22 Feb 2017

A very windy day with scattered heavy showers, these wintry above 600M. Showers will be more frequent in the north with the driest and sunniest conditions across the southern ranges.

Thu 23 Feb 2017

Mostly dry and bright start to the day with scattered heavy showers or longer spells of rain later in the day. Moderate to fresh, but temporarily strong, west-northwest winds.

Fri 24 Feb 2017

It will be generally dry and bright with only a few showers across western ranges. Easing winds. Freezing level around 200m in the morning, rising later in the day.

Issued at: 1512 on Sun 19 Feb 2017