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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The warmest day of the next seven will occur on Saturday as southerly flow increases ahead of a strong cold front and upper-level wave of jet stream energy. Trey Fulbright, CBS News, 2 Apr. 2026 Depending on conditions in the atmosphere, the jet stream can be fairly flat and fast moving or meander. Dinah Voyles Pulver, USA Today, 31 Mar. 2026 The team used supercomputer simulations of the atmosphere and found that the rise is driven by stronger wind shear in the jet stream. Georgina Jedikovska, Interesting Engineering, 31 Mar. 2026 Also riding this jet stream of enhancements are, among others, Qantas and Korean Air. Michael Verdon, Robb Report, 28 Mar. 2026 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 5 Apr. 2026.

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

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