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   Carruthers  Sunday Jul 13 06:52 AM

July 13th 2014: Noctilucent Clouds.

Noctilucent clouds have been seen over wide areas of England several nights during the last week.
I always seem to miss these phenomena. A couple of years ago the Northern Lights were visible in SE England and while listening to the radio at about 3am someone phoned in from a location just a few miles north of here saying they could be seen at that minute. Pausing only to don my dressing gown I went to have a look. Zilch! Such is life.

Attachment 48539

Both photos were taken near Sunderland on the NE Coast of England, the one above at 2am.

Attachment 48540

From the Ch 4 weather blog:

Last night delivered a spectacular showing of noctilucent clouds in the sky above the UK, leading to a flurry of tweets this morning, asking me what they are.

The word noctilucent comes from the Latin words nocti and lucent, meaning night and shining respectively.

The rarity of catching a glimpse of noctilucent clouds means that each summer, dedicated cloud spotters stare up at the sky, hoping to catch them on camera.

They are the highest clouds in the earth’s atmosphere, found in the mesophere – around 50 miles above the ground.

Formed from tiny ice crystals, they are characterised by their thin streaky cirrus-like appearance, and are usually bluish of silvery in colour.

The reason for them being so rare is because they occur in a part of the atmosphere that is extremely dry and has very little moisture present.

Also, there are very few cloud condensation nuclei, such as volcanic dust or debris from meteors, for water vapour to stick to – making their presence such a rare occurrence.

In addition, they are only found at latitudes of around 45 to 80 degrees north or south of the equator and require the sun to be below the horizon.

It’s the presence of the sun below the horizon that illuminates the clouds from below, meaning that they often appear faintly.
Channel 4

Huffington Post.

xoxoxoBruce  Sunday Jul 13 11:34 AM

Learn your basic science, Carruthers.

Noctilucent clouds shall never appear to anyone wearing a dressing gown.
Nice post, thank you.

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