POLAR STRATOSPHERIC CLOUDS OVER THE UK: An outbreak of polar stratospheric clouds (PSCs) is underway--but not around the poles. Sky watchers are reporting the beautifully-colored clouds over the UK. David Porter photographed this specimen on Jan. 29th from his home in Turriff, Aberdeenshire:

... Also known as "nacreous" or "mother of pearl" clouds, icy PSCs form in the lower stratosphere when temperatures drop to around minus 85ºC. High-altitude sunlight shining through tiny ice particles 10µm wide produce bright iridescent colors by diffraction and interference. Once thought to be mere curiosities, some PSCs are now known to be associated with the destruction of ozone.
http://www.spaceweather.com/archive.php ... &year=2016
If you live in the Northern latitudes, look at the sky just before sunrise. Maybe you will spot one.
As these become more common, they will be a foreboding of the mini-ice age (a type of Maunder Minimum), which is approaching as the earth cools. Expect more cold weather and more blizzards in 2016 through 2030.