Discussion
Which term describes an isolated tongue of stratospheric air?
Answer: A
Wave breaking on an isentropic surface draws long filaments of high potential vorticity air equatorward, and these streamers sometimes pinch off into isolated cut-off features. The tropopause fold is the same feature seen in a vertical section and the dry intrusion is its signature in water vapour imagery, so all three describe closely related aspects of one structure. The shared properties explain why these belong to one family, and the differences explain why more than one exists.
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