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West Highlands mountain area forecast

Forecast issued: 0206 on Monday, 22 September 2014

Overview for Monday

Dry start with some mist and fog. Cloudy in northwest with rain developing, but the south of area dry with some sunny spells before clouding over later. Windy in northwest for a time.

Hazards

Medium risk of Gales: Across some northwestern Munros late morning till early evening, gusts 50mph.

Medium risk of Persistent extensive hill fog: Locally during morning and again in northwest later in day.

Low risk of Heavy persistent rain: Possible over the far northwest later.

Low risk of Strong sunlight: Possible in Trossachs and south at first.

No risk of Blizzards; Heavy snow; Storm force winds; Severe chill effect; Thunderstorms;

Weather summary and probability of precipitation for Monday

Dawn to 0900 Mist Mist 0% chance of precipitation
0900 to 1200 Sunny intervals Sunny intervals 10% chance of precipitation
1200 to 1500 Cloudy Cloudy 10-30% chance of precipitation
1500 to dusk Cloudy Cloudy 30-50% chance of precipitation

Detailed mountain weather forecast

Monday

Weather

Dry overnight, rather cloudy in the northwest but clear spells elsewhere with some mist forming and also rather cold by dawn. A misty start in many glens and lower slopes but this thinning and southern ranges from around Glencoe southwards into the Trossachs will brighten up with some pleasant sunny spells, especially towards Ben Lomond. To the north it will however quickly cloud over with rain reaching Skye around noon and spreading across the Northwest Highlands during the afternoon and becoming persistent during the evening. The rain spreading down into North Argyll, Glencoe and the Great Glen during the late evening.

Visibility

Mostly moderate overnight reducing poor in places by dawn with some fog patches in southern glens. After daybreak slowly improving moderate or good by lunchtime though only neighbouring hills becoming distinct. Later in the day under the rain band in the northwest tending to reduce moderate or poor.

Hill fog

Overnight patches below 400 metres becoming more widespread by dawn, then slowly lifting mid-morning. However periods 600 to 750 metres spreading from the northwest late morning and becoming extensive across the northwest Highlands by early evening. Some banks lowering 400 metres in persistent rain. Odd patches 750 metres across the south of the region by dusk.

Maximum winds above 600m

West or Southwest 20 gust 30mph increasing 25 gust 40mph later. However over the northwest increasing 35 gust 50mph for a time, easing late evening.

Temperature

Glens: Plus 3 rising 16 Celsius.
900 m: 4 rising 7 Celsius.
Freezing level: above summits.

Tuesday

Weather

Overnight rain should have cleared away to the east by dawn so some bright or sunny spells for a time. However thickening cloud with showery rain will spread back across the northwest and Skye around lunchtime and reach most ranges by evening, some of the rain quite heavy later over western slopes.

Visibility

Moderate or good, perhaps very good for a time towards noon with more distant peaks becoming discernable. However reducing mostly moderate as rain returns and locally poor later.

Hill fog

Occasional periods 450 to 750 metres at first, lifting nearer 900 metres by lunchtime. then as rain returns periods 600 metres forming and becoming more persistent in the west and northwest later. Some banks lowering 400 metres in western coastal ranges by evening.

Maximum winds above 600m

West or Southwest 25 gust 35 but some gusts 45mph in north.

Temperature

Glens: 9 rising 16 Celsius.
900 m: 7 Celsius
Freezing level: above summits.

Outlook

Wednesday

Many ranges having a mostly dry bright day with some sunny spells, brightest over the Trossachs and ranges up through Rannoch Moor to the Great Glen. However over the northwest and Skye cloud will thicken up with drizzly rain developing late in the day with some hill fog by dusk. Fresh or strong Northwest winds.

Thursday

Mostly cloudy and tending to be misty with abundant hill fog, especially on coastal ranges where visibility could be poor. Some drizzle and strong West to Southwest winds increasing gale force, severe gales later across the northwest with gusts 60mph. Rain may develop more notably during evening.

Friday

Starting dull and rainy, with mist and hill fog, possible some persistent rain for southern ranges, but drier brighter weather spreading from the northwest later. Westerly gales easing a little.


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