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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
Distortions in the jet stream will allow the cold air to stagnate and linger over much of the Eastern United States.
—Elizabeth Both, NBC News, 2 Jan. 2025
This outbreak follows severe weather earlier this week in Texas, and is the result of a deep dip, or trough, in the jet stream that is pulling moisture from the Gulf of Mexico northward.
—Andrew Freedman, Axios, 28 Dec. 2024
Turbulence is the result of air moving in unusual or unexpected ways and can be caused by anything from thunderstorms to air moving up and around mountains to another aircraft’s jet stream.
—Alison Fox, Travel + Leisure, 2 Dec. 2024
One is the weakening of the jet stream, which is being induced by climate change, facilitating the descent of cold air from polar regions.
—Geraldine Castro, WIRED, 28 Nov. 2024
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Word History
First Known Use
1947, in the meaning defined above
Dictionary Entries Near jet stream
Cite this Entry
“Jet stream.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/jet%20stream. Accessed 8 Jan. 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
Britannica.com: Encyclopedia article about jet stream
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