Difference between revisions of "Jet stream"

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<div class="definition"><div class="short_definition">Relatively strong winds concentrated within a narrow stream in the [[atmosphere]].</div><br/> <div class="paragraph">While this term may be applied to any such stream regardless of direction (including vertical),  it is coming more and more to mean only a quasi-horizontal jet stream of maximum winds embedded  in the midlatitude [[westerlies]], and concentrated in the high [[troposphere]]. The question of the  maintenance of the jet stream is a cardinal problem of theoretical meteorology. Two such jet streams  are sometimes distinguished. The predominant one, the [[polar-front jet stream]], is associated with  the [[polar front]] of middle and upper-middle latitudes. Very loosely, it may be said to extend around  the hemisphere, but, like the polar front, it is discontinuous and varies greatly from day to day.  A [[subtropical jet stream]] is found, at some longitudes, between 20&deg; and 30&deg; latitude and is strongest  off the Asian coast. Currently, in the [[analysis]] of upper-level charts, a jet stream is indicated  wherever it is reliably determined that the [[wind speed]] equals or exceeds 50 knots. <br/>''See'' [[thermal  jet]].</div><br/> </div>
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<div class="definition"><div class="short_definition">Relatively strong winds concentrated within a narrow stream in the [[atmosphere]].</div><br/> <div class="paragraph">While this term may be applied to any such stream regardless of direction (including vertical),  it is coming more and more to mean only a quasi-horizontal jet stream of maximum winds embedded  in the midlatitude [[westerlies]], and concentrated in the high [[troposphere]]. The question of the  maintenance of the jet stream is a cardinal problem of theoretical meteorology. Two such jet streams  are sometimes distinguished. The predominant one, the [[polar-front jet stream]], is associated with  the [[polar front]] of middle and upper-middle latitudes. Very loosely, it may be said to extend around  the hemisphere, but, like the polar front, it is discontinuous and varies greatly from day to day.  A [[subtropical jet stream]] is found, at some longitudes, between 20&#x000b0; and 30&#x000b0; latitude and is strongest  off the Asian coast. Currently, in the [[analysis]] of upper-level charts, a jet stream is indicated  wherever it is reliably determined that the [[wind speed]] equals or exceeds 50 knots. <br/>''See'' [[thermal jet|thermal  jet]].</div><br/> </div>
 
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Latest revision as of 16:16, 25 April 2012



jet stream

Relatively strong winds concentrated within a narrow stream in the atmosphere.

While this term may be applied to any such stream regardless of direction (including vertical), it is coming more and more to mean only a quasi-horizontal jet stream of maximum winds embedded in the midlatitude westerlies, and concentrated in the high troposphere. The question of the maintenance of the jet stream is a cardinal problem of theoretical meteorology. Two such jet streams are sometimes distinguished. The predominant one, the polar-front jet stream, is associated with the polar front of middle and upper-middle latitudes. Very loosely, it may be said to extend around the hemisphere, but, like the polar front, it is discontinuous and varies greatly from day to day. A subtropical jet stream is found, at some longitudes, between 20° and 30° latitude and is strongest off the Asian coast. Currently, in the analysis of upper-level charts, a jet stream is indicated wherever it is reliably determined that the wind speed equals or exceeds 50 knots.
See thermal jet.