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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
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These effects, writes NWS, are more acute during the winter months when the jet stream is strongest over the United States, which causes colder and stormier than average conditions across the North and warmer, less stormier conditions in the south.
—John Tufts, The Indianapolis Star, 18 Dec. 2024
The jet stream is likely to prevent big storms up north from dipping into Southern California.
—Karen Kucher, The Mercury News, 11 Dec. 2024
How weather patterns guide lake-effect snow to Great Lakes region
Large-scale weather and climate patterns, guided, in part, by the jet stream, play a major role in the storms and cold outbreaks that define winter weather across the Great Lakes.
—Carlie Procell, USA TODAY, 3 Dec. 2024
La Niña causes the jet stream to dip southward, allowing colder Arctic air to invade the Great Lakes region.
—Mark R. Weaver, Newsweek, 4 Dec. 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 24 Dec. 2024.
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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