'❌ MARKS THE SPOT': Those straight, cloud-like formations in the sky are not what you may think they are. FOX Weather Meteorologist Ari Sarsalari breaks down what a contrail actually is and how they're formed. Spoiler alert: it's all about moisture in the atmosphere. 👇Tell us in the comments. Do you see contrails where you live? #FOXWeather #contrails #atmosphere #travel #sky