Description

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 a maximum of 40 kts at a height of 130-660 ft above the ground. Surface winds below the jet are significantly weaker so the presence of a valley exit jet above an aerodrome may not be indicated by the published surface wind vector.

There are 2 types of valley exit jet: