Contrails

Contrails (short for "condensation trails") or vapour trails are artificial clouds that are the visible trails of condensed water vapour made by the exhaust of aircraft engines. As the hot exhaust gases cool in the surrounding air they may precipitate a cloud of microscopic water droplets. If the air is cold enough, this trail will comprise tiny ice crystals.[1]

Today the conditions were conducive to long-lasting contrails. We also had high cirrus clouds that caused a ring around the sun. The planes all are going in the same direction, indicating a major airline route passing over our area.