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Refer to figure.
Using the significant weather chart indicated, regarding the jet stream located to the north-west of Norway, what is the significance of the number "480?" written underneath the jet "150/480?"?
  • A
    This is the upper boundary of the jet stream expressed as a flight level.
  • B
    This is the maximum speed in knots attained in the jet core.
  • C
    This is the local temperature in Kelvin at the height of the jet stream core.
  • D
    This is the upper limit of the associated Clear Air Turbulence area expressed as a flight level.

Refer to figure.

"150 - 480" below "FL310" indicates Jet Depth: The vertical depths to the 80 knot wind field above and below the jet steam using flight levels.
Jet stream's Lower limit FL150; Upper limit FL480

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