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West Highland: forecast pressure
Saturday, 18 May 2013: dawn to dusk
Printable view Forecast issued: 0410 on Saturday, 18 May 2013
Overview for Saturday
Cloudy and very windy with gales, mist and hill fog. Persistent rain in far north and Trossachs, drier amongst Glencoe and Argyll ranges where quite warm. Some heavy rain.
| Hazards | Risk | Explanation |
|---|---|---|
| Blizzards | No Risk | |
| Heavy snow | No Risk | |
| Storm force winds | Low | Isolated gusts 75mph possible higher hills. |
| Gales | High | Expected with widely gusts 50mph. Occasional gusts 65mph. |
| Severe chill effect | No Risk | |
| Persistent and extensive hill fog | High | Especially in north and Trossachs where as low as 100 to 300 metres, higher levels over Argyll. |
| Thunderstorms | Low | Possible in afternoon southern ranges but very shortlived. |
| Heavy persistent rain | Low | Possible, mainly southern areas around Trossachs. |
| Strong Sunlight | No Risk |
key to hazards and forecast content
| Dawn to 0900 | 0900 to 1200 | 1200 to 1500 | 1500 to dusk |
 Cloudy |
 Heavy rain showers |
Heavy rain showers |
Heavy rain showers |
| 10-30% | 50-70% | 50-70% | 50-70% |
Detailed mountain weather forecast: West Highlands
Saturday
Weather
Cloudy with some spells of rain, these more persistent across the hills of Sutherland and the Trossachs where some heavier bursts with even a thundery downpour possible, whilst Lochaber, Glencoe and parts of Argyll see lighter rain with perhaps some brightness at times and the best of the dry spells.
Visibility
Moderate along the western coastal ranges. Otherwise moderate or poor and within spells of rain reducing very poor. Navigational hazards on many hills, especially the more eastern and northern ranges.
Hill fog
Periods 450 to 750 metres, extensive over Sutherland and the Trossachs where often lowering 100 to 300 metres on northeast facing hills. Some gaps over Argyll and up towards Nevis Ranges.
Maximum winds above 600m
Northeasterly 35 to 40mph gusts 50 to 65mph, isolated gusts 75mph higher summits.
Temperature
| Glens | 7 rising 14 to 19 Celsius, warmest north Argyll. |
| 900 m | Around 6 rising plus 10 Celsius. |
| Freezing level | Above summits. |
Sunday
Weather
Still a changeable period of weather with a good deal of cloud and some light bursts of rain. Rather misty with hill fog, especially during the morning and on east facing slopes over the Trossachs and Sutherland, but lifting later. Argyll coastal ranges up to Nevis range will have some brighter spells with even a few sunny glimpses.
Visibility
Moderate or poor, occasionally good during afternoon along the western coastal ranges. Within spells of rain reducing very poor at times with hill fog and rain giving navigational hazards on many slopes in the north and east, especially at first.
Hill fog
Periods 600 to 900 metres, more extensive over Sutherland and the Trossachs where occasionally lowering 300 to 450 metres on east facing hills during rain.
Maximum winds above 600m
East, 20 to 30mph gust 40mph at first, soon easing 15mph.
Temperature
| Glens | plus 8 rising 18 Celsius. |
| 900 m | plus 10 Celsius. |
| Freezing level | Well above summits. |
Outlook
Monday
A few showers but a reasonable amount of dry weather with some gaps in the cloud allowing a brighter day generally with some sunny intervals for many ranges. Light North or Northeast winds will freshen, strong by dusk over Northwestern peaks. Staying mild with patchy hill fog tending to lift through the day.
Tuesday
A weak high pressure ridge looks like giving a drier more settled spell with more in the way of sunny spells but also colder conditions with brisk North or Northwest winds, strong over summits. Freezing levels fall to around 1000metres, perhaps a little lower in the north later.
Wednesday
Cold strengthening Northwest winds will bring freezing levels down to near 800 metres with light snow showers developing, these falling as sleet down to around 500metres and some rain in the glens. Some wind-chill but still sunny intervals between showers.
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