Practice question

What is the regulatory definition of a 'Jet Stream' in meteorology?

  1. A strong, narrow, westerly current of air in the upper atmosphere, with a wind speed of 60 knots or more
  2. Any wind gust exceeding 50 knots detected by aerodrome LLWAS equipment
  3. The localized exhaust trail behind a turbojet aircraft during climb
  4. The cold downdraft vector projecting from the base of a cumulonimbus cloud

Answer: A — A strong, narrow, westerly current of air in the upper atmosphere, with a wind speed of 60 knots or more

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