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West Highlands mountain area forecast

Forecast issued: 0223 on Thursday, 28 August 2014

Overview for Thursday

A band of rain will move across all of the Scottish high ground this moving through quite smartly with brighter conditions with showers following.

Hazards

High risk of Storm force winds: At first and again in west in late evening.

High risk of Gales: Throughout the day

High risk of Severe chill effect: In the rain in the morning

High risk of Persistent extensive hill fog: In the morning

High risk of Heavy persistent rain: Mainly over Argyll and the Trossachs at first

Medium risk of Strong sunlight: From mid morning onwards as rain clears, sunburn risk.

No risk of Blizzards; Heavy snow; Thunderstorms;

Weather summary and probability of precipitation for Thursday

Dawn to 0900 Heavy Rain Heavy Rain 80% chance of precipitation
0900 to 1200 Light rain Light rain 60% chance of precipitation
1200 to 1500 Sunny intervals Sunny intervals 20% chance of precipitation
1500 to dusk Light rain showers Light rain showers 30% chance of precipitation

Detailed mountain weather forecast

Thursday

Weather

A cloudy start to the day with rain affecting all but Ben Wyvis and the Hills of Caithness however the rain will soon spread across this area as well. The heaviest of the rain will be over the Argyll and the Trossachs. This rain will also be accompanied by storm force winds across the higher summits. The rain will soon start to die out over Arran and the Arrochar Alps with some bright then sunny spells following. The winds will also ease back to gale force. These brighter and drier conditions will quickly move north reaching all but the hills of Caithness by midday and clearing these by early afternoon. Within the following sunnier conditions there will also be a few showers most likely to be focused over the hills around Dalmally. Then more persistent heavy rain will arrive in Argyll amd Lochaber towards midnight.

Visibility

Poor at first in the rain but becoming good to very good as the rain clears.

Hill fog

Extensive over the whole area at first with bases ranging from 500 metres over Argyll and the Trossachs to 750metres over Skye and Assynt. This soon breaking up to leave occasional patches around 750metres

Maximum winds above 600m

Southeasterly 50 to 60mph with gusts to 80mph at first particularly over the more exposed ridges and summits during the period of the rain. Winds easing to 30mph with gusts to 50mph after the passage of the rain. Gusts back up to 70mph by late evening.

Temperature

Glens: 8 Celsius rising to 19 Celsius in the afternoon.
900 m: Plus 8 Celsius rising to 10 Celsius in the sunshine.
Freezing level: Above the summits.

Friday

Weather

A dry start to the night but bands of showers will start to move across from the west later in the night these possible heavy at times particularly over the Trossachs. Showery for the walking day, these heavy at times with the risk of thunder with the main risk of this being over Glencoe and the Nevis range. Breezy with gales across the tops. Although it will be fairly cloudy there will be some bright or sunny intervals as well, the best of these over Assynt where there will be fewer showers as well.

Visibility

Moderate in and around the showers otherwise good to very good with very good clarity to the air.

Hill fog

Occasional around 600 metres lowering to 450 metres in the heavier showers.

Maximum winds above 600m

The southeasterly winds will back Southerly overnight but maintain speeds of around 30 to 40mph with gusts to 50mph.

Temperature

Glens: Plus 7 Celsius rising to 19 Celsius.
900 m: Plus 7 Celsius
Freezing level: Above the summits.

Outlook

Saturday

Sunny spells and a scattering of showers, these mainly across the north and west. Drier across the south. Gale force northwesterly winds.

Sunday

Cloudy with some patchy rain in the north at first but dying out leave a fine dry day with sunny spells and fairly light winds.

Monday

Cloudy with rain and extensive hill fog at first with gale force southwesterly winds. Soon becoming drier and brighter from the west with sunny spells.


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