Editing Jet stream (section)

===Valley exit jet===
A [[valley exit jet]] is a strong, down-valley, elevated air current that emerges above the intersection of the valley and its adjacent plain. These winds frequently reach speeds of up to {{cvt|20|m/s|km/h mph|||}} at heights of {{cvt|40|-|200|m||}} above the ground. Surface winds below the jet tend to be substantially weaker, even when they are strong enough to sway vegetation.

Valley exit jets are likely to be found in valley regions that exhibit [[wikt:Special:Search/diurnal|diurnal]] mountain wind systems, such as those of the dry mountain ranges of the US. Deep valleys that terminate abruptly at a plain are more impacted by these factors than are those that gradually become shallower as downvalley distance increases.<ref>Whiteman, C. David (2000). ''Mountain Meteorology'', p. 193. Oxford University Press, New York. {{ISBN|978-0-19-803044-7}}, pp. 191–193.</ref>