[Unusual Sky]

Morning Mike, they look like Nacreous clouds potentially:

What is so special about Nacreous Clouds- mother of pearl Polar Stratospheric Clouds

WWW.NETWEATHER.TV

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Way up in the Stratosphere there is very cold air above us. It's causing excitement for those who watch such things as a precursor to a possible cold, winter spell. This air can produce Nacreous Clouds PSCs

 

[Unusual cloud]

Wow, a pretty rare beast that, good catch

It's Kelvin Helmholtz clouds, caused by instability in the atmosphere, with changing wind speeds at different heights. 

 

Kelvin-Helmholtz cloud

WWW.METOFFICE.GOV.UK

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An extremely rare phenomenon, where a cloud produces a billowing wave pattern. They occur when there is a strong vertical shear between two air streams, causing...

 

[mammatus.jpg]

Nice catch

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It's not a lenticular. It's more likely to be a shelf cloud on a cumulonimbus, or potentially even an lp supercell  

[Looking across Loch Morlich 21st November 2015]

Yep, it's a nice beach when the sun's out, kind of bizarre walking on snow over the sand. 

[Can someone tell me what this straight line is]

It's an approaching weather front/trough I'd expect  

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That looks pretty cool Stu, the strikealerts have got very flash - they used to just be little black things which beeped!

[Ice Station Deborah]

What a great igloo, always wanted to make one of those when I was a kid but never quite had enough snow, or patience!

[Rocky Mountains November 2nd Snowfall]

Awesome image

[12/8/2004 thunderstorm]

Great pics Thundery - a nice gallery all round - look forward to seeing more of your shots