jet stream

noun

: a long narrow meandering current of high-speed winds near the tropopause blowing from a generally westerly direction and often exceeding a speed of 250 miles (402 kilometers) per hour

Examples of jet stream in a Sentence

Recent Examples on the Web
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Cirrus clouds at the level of the jet stream – often about 6 miles (10 kilometers), above the ground – can sometimes move at over 200 miles per hour (320 kilometers per hour). Ross Lazear, The Conversation, 3 Mar. 2025 Warming oceans can cause the jet stream—a narrow, high-altitude current of fast-moving air that influences weather across the continent—to move off course. Sara Hashemi, Smithsonian Magazine, 17 Jan. 2025 Normally, the jet stream resembles a real stream, slicing directly across the country with perhaps a few small meanders. Ned Kleiner, Los Angeles Times, 10 Jan. 2025 The Meteorological Puzzle Climate experts point to unusual jet stream patterns as a key factor behind this atypical snowfall. Jim Foerster, Forbes, 4 Mar. 2025 See All Example Sentences for jet stream

Word History

First Known Use

1947, in the meaning defined above

Time Traveler
The first known use of jet stream was in 1947

Browse Nearby Words

Cite this Entry

“Jet stream.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/jet%20stream. Accessed 26 Mar. 2025.

Kids Definition

jet stream

noun
: a long narrow wandering current of high-speed winds blowing from a generally westerly direction several miles above the earth's surface

More from Merriam-Webster on jet stream

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