Netherlands residents may wake up to a beautiful purple glow in the sky on Christmas morning. Due to the bitter cold high in the air, pearlescent clouds may form, according to meteorologist Arjan Willemse, RTL Nieuws reports.
"Normally clouds are made of water vapor. Not these clouds. Pearlescent clouds consist of waste products: chlorides that are emitted by us humans. These chlorides are poorly degradable and clump together at extremely low temperatures, which in turn creates pearlescent clouds", Willemse said to the broadcaster.