See the rare rainbow cloud that just formed over Ireland and England

The skies above Dublin, Ireland, and northeast England became a spectacular site of "utterly transfixing" iridescent lights Thursday morning. Rare "rainbow clouds" formed in the early morning, creating waves of yellows, pinks and blues above homes. 

Locals took videos of the clouds, which give the sky an almost oil slick-like sheen. According to NOAA, the phenomenon is "relatively rare" and only happens when a cloud is thin and full of water droplets or ice crystals. 

"I was lucky enough to spend time with some very rare nacreous clouds this morning appearing & evanescing near Swords, north county Dublin," said one person who posted a video of the clouds on social media. "Utterly transfixing & mesmerising."