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jet stream

noun
1.
strong, generally westerly winds concentrated in a relatively narrow and shallow stream in the upper troposphere of the earth.
2.
similar strong winds in the atmosphere of another planet:
jet streams on Jupiter.
3.
the exhaust of a jet or rocket engine.
Origin
1945-1950
1945-50
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for jet stream
  • Cool air fed by the jet stream, a strong band of wind in the atmosphere, provides even more energy.
  • The high-pressure system-a large area of dense air-is being held in place by upper-level winds known as the jet stream.
  • The jet stream is weaker but you get those scorching days.
  • And muffling this, uh, jet stream can't be done by conventional methods of baffling the flow since it will choke off the exit.
  • Presumably this approach will enable the ship to navigate past the jet stream and maintain its position.
  • They also defect winds high into the jet stream where they get ripped off and carried away.
  • Compared with last winter, this one has been unusually mild, thanks to the jet stream's northern route.
  • As the jet stream migrates northward in spring, rain lessens--and is quite scarce by summer.
  • The jet stream will undergo some interesting changes over the next few weeks.
British Dictionary definitions for jet stream

jet stream

noun
1.
(meteorol) a narrow belt of high-altitude winds (about 12 000 metres high) moving east at high speeds and having an important effect on frontogenesis
2.
the jet of exhaust gases produced by a gas turbine, rocket motor, etc
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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jet stream in Science
jet stream  

A narrow current of strong wind circling the Earth from west to east at altitudes of about 11 to 13 km (7 to 8 mi) above sea level. There are usually four distinct jet streams, two each in the Northern and Southern hemispheres. Jet stream wind speeds average 56 km (34 mi) per hour in the summer and 120 km (74 mi) in the winter. They are caused by significant differences in the temperatures of adjacent air masses. These differences occur where cold, polar air meets warmer, equatorial air, especially in the latitudes of the westerlies.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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jet stream in Culture

jet stream definition


A narrow band of swiftly moving air found at very high altitudes.

Note: Movements of the jet stream have important (but generally short-lived) effects on weather patterns.
Note: Travel time in an airplane can be lengthened or shortened by the jet stream, depending on the direction of flight and the strength of the stream.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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