Google Tag Manager (noscript) End Google Tag Manager (noscript) Skip to main content Biz & IT Tech Science Policy Cars Gaming & Culture Store Forums Subscribe Close Store Subscribe Videos Features Reviews RSS Feeds Mobile Site About Ars Staff Directory Contact Us Advertise with Ars Reprints Biz & IT Tech Science Policy Cars Gaming & Culture Store Forums Front page layout Grid List Site theme light dark Sign in Eric Berger - Oct 23, 2023 2:14 pm UTC Enlarge / The 2023-2024 US Winter Outlook map for precipitation. NOAA 48 with cache hit 1055:single/related:939538635947ae2246f9a6b4349214af empty As its name implies, the jet stream is essentially a river of fast-moving air in the atmosphere at about the altitude where airplanes fly. It is typically a few hundred miles across, ...