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West Highlands

Weather hazards over 300m on Sat 30 Apr 2016

High risk

No high risks
none

Medium risk

Gales
Southerly winds increasing with gusts around 60mph over ridges and summits later.
Strong sunlight
Sunburn risk from strong sunlight and glare from fresh snow

Low risk

Heavy snow
Heavy snow showers but not expected to be prolonged
Severe chill effect
Increasing winds late in the day and near zero temperatures may produce a significant chill.
Thunderstorms
Risk of thundery showers for a time, especially for eastern ranges early to mid afternoon.

No risk

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

Sat 30 Apr 2016

Scattered showers in the west initially develop more widely through the morning as temperatures rise and cloud bubbles up. The showers, the snow level gradually rising, will be heavy at times during the early to mid-afternoon with a risk of thunder, mainly across eastern ranges. The showers will die out during the late afternoon as cloud above the summits increases with outbreaks of rain reaching far western ranges towards midnight. Lying snow below about 900m gradually thawing.

Time
0600 to 0900 0900 to 1200 1200 to 1500 1500 to 1800 1800 to 2100 2100 to 2400
Weather
Sunny intervals Sunny intervals Sunny intervals Sunny intervals Sunny intervals Cloudy
Precipitation probability
20% 30% 30% 30% 0% 30%

Visibility

Very good or excellent with some good panoramic views of surrounding snow covered hills and mountains becoming poor or very poor in snow.

Hill Fog

Occasional patches at first above 600m in the west developing more widely and then rising to above 900m. In or near showers periods of hill fog develop around 600m.

Max wind above 600m

Westerly gradually backing southwesterly 15-20mph, then backing more southerly and increasing 30-40mph, with gusts around 60mph over ridges and summits, during the late evening

Temperature

Valleys:
Minus 3 Celsius rising to around plus 11 Celsius by day then falling back to plus 4 Celsius in the evening.
800m:
Around minus 3 Celsius rising to plus 2 Celsius.
Freezing level:
Around 600m, but frozen surfaces at lower levels expected at first on Saturday morning, rising to above the summits by midnight.

Sun 01 May 2016

Cloudy with outbreaks of rain spreading quickly east through the early hours, perhaps preceded by snow on the higher summits, and becoming heavy and persistent, especially across Argyll, Lochaber and The Trossachs. The rain clears away east through the morning but it remains rather cloudy, best of any bright or sunny spells likely across the northern Northwest Highlands. Thickening cloud then brings further occasionally heavy rain from mid-afternoon and through evening. Lying snow thawing at all levels.

Visibility

Visibility very good falling moderate or poor in rain.

Hill Fog

Periods or persistent, but occasional at times over the northern Cairngorms, above about 600m developing through the early hours but lowering to 300m at times, especially in the west, in heavier more persistent rain.

Max wind above 600m

Southerly or southwesterly 30-40mph increasing 45-50mph at times, with gusts around 75mph over ridges and summits.

Temperature

Valleys:
Plus 4 Celsius rising to plus 12 Celsius by day, falling back to plus 9 Celsius by midnight.
800m:
Around plus 2 Celsius rising to plus 4 Celsius.
Freezing level:
Above the summits

Mon 02 May 2016

Rain clearing overnight to leave a bright day with sunshine and showers, these falling increasingly as snow above about 600m. Strong to gale force southwesterly winds, perhaps severe gales at times. Freezing level falling to around 750m.

Tue 03 May 2016

A blustery day with sunny spells and showers, the showers most frequent in the north and west, with snow above about 600m. Gale or severe gale force westerly winds. Freezing level around 750m rising towards highest summits later.

Wed 04 May 2016

Mostly cloudy with outbreaks of rain, perhaps some snow on highest summits, the rain heavy and persistent at times in the west through the afternoon.. Gale or severe force southerly or southwesterly winds. Freezing level just above the summits.

Issued at: 0502 on Sat 30 Apr 2016