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In pictures: 'Flying saucer clouds' and red skies

Cogies Auroras/BBC Weather Watchers Lenticular cloudsCogies Auroras/BBC Weather Watchers
Lenticular clouds photographed from Rogart in the Highlands

Striking red skies at sunset and UFO flying saucer-like lenticular clouds were visible from parts of Scotland on Wednesday.

Lenticular clouds  form when the air is stable and winds blow across hills and mountains from a similar direction at different heights through the troposphere, according to the Met Office.

Ticketyboo_sus/BBC Weather Watchers Red sky at MethlickTicketyboo_sus/BBC Weather Watchers
Sundown at Methlick in Aberdeenshire
Tattie-Bogle/Inverness Clouds from InvernessTattie-Bogle/Inverness
Wednesday evening's sky pictured from Inverness
Umbraticus/BBC Weather Watchers Lenticular cloudsUmbraticus/BBC Weather Watchers
Lenticular clouds get their flying saucer nickname from their curved shape and layers
Alan/BBC Weather Watchers Sky from PeeblesAlan/BBC Weather Watchers
A fiery glow to the sky over Peebles in the Scottish Borders
Lisa@Lethen/BBC Weather Watchers Lenticular cloudsLisa@Lethen/BBC Weather Watchers
Nairn on the Moray Firth coast offered some good views of the cloud formations
Rescue John/BBC Weather Watchers Lenticular cloudsRescue John/BBC Weather Watchers
Another image of Wednesday's sky taken from Nairn
Davis Vantage View/BBC Weather Watchers Sky over CullenDavis Vantage View/BBC Weather Watchers
Cullen, also on the Moray Firth coast, also enjoyed a spectacular evening weather-wise
Craig Swan Sunset from Grantown on SpeyCraig Swan
The sunset pictured from Grantown on Spey in the Cairngorms National Park
Solway View/BBC Weather Watchers Sundown in DumfriesSolway View/BBC Weather Watchers
Sundown in Dumfries