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And the season begins, a few sightings in UK already. @NLCalerts #NLC2019 @NLCnet New blog https://www.netweather.tv/weather-forecasts/news/9607-what-are-noctilucent-clouds-also-known-as-nlcs-or-polar-mesospheric-clouds-pmcs Noctilucent clouds are rapidly spreading around the Arctic Circle. First sighted by NASA's AIM spacecraft on May 20th, small wisps of electric blue have since multiplied in areal coverage by a factor of nearly 200. SpaceWeather UK 09/10 June 2019 UK 25th