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During flight planning, information about the existence and severity of turbulence aloft can be found on the appropriate..
  • A
    wind and temperature chart.
  • B
    significant weather chart.
  • C
    contour line chart with isohypses.
  • D
    surface analysis chart.

Significant Weather Charts are visual presentations of significant weather phenomena for a given geographical region. SIGWX charts are issued by World Area Forecast Centers (WAFC) every six hours (at 00:00, 06:00, 12:00 and 18:00 UTC) as forecast charts to a fixed time specified on the chart.

In accordance with ICAO Annex 3, the following weather phenomena have to be shown on a Significant Weather (SIGWX) Chart if present in the chart coverage area:

A) thunderstorms (indicate moderate/severe turbulence/icing),
B) tropical cyclone,
C) severe squall lines,
D) moderate or severe turbulence (in cloud or clear air),
E) moderate or severe icing,
F) widespread sandstorm / dust storm,
G) for FL100 to FL250, clouds associated with a) to f),
H) above FL250, cumulonimbus cloud associated with a) to f),
I) surface position of well-defined convergence zones,
J) surface positions, speed and direction of movement of frontal systems when associated with significant en-route weather phenomena,
K) tropopause heights (tropopause level, tropopause high, tropopause low),
L) jet streams,
M) volcanic eruptions producing ash clouds of significance to aircraft operations, including those producing only steam.

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