We see contrails every day in the Boulder skies. Colored like clouds, they are the straight lines in the sky that trail jet planes. And what are they? Why do they appear at all? Some of the Most Interesting Contrails I’ve Seen       pic Lensworth Contrails, short for “condensation trails,” are cloud-like trails left behind by […]

The  Boulder Colorado sky of the setting sun, lighting up our clouds with beauty and contrails.  Photo Debi Dodge Contrails, short for condensation trails, are the visible trails of water vapor or ice crystals that form behind aircraft flying at high altitudes. Their appearance is a common sight in the sky, often seen as long, […]