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An aircraft in flight encounters an isolated thunderstorm that is obscured by other cloud. The aircraft does not encounter hail. Must this be reported and if so, when?
  • A
    Yes, after landing.
  • B
    There is no requirement to report such a thunderstorm.
  • C
    Yes, in the aircraft`s next routine meteorological report.
  • D
    Yes, as soon as possible in a special report.

ICAO Doc 4444
4.12.3 Contents of special air-reports

4.12.3.1 Special air-reports shall be made by all aircraft whenever the following conditions are encountered or observed:

a) moderate or severe turbulence; or
b) moderate or severe icing; or
c) severe mountain wave; or
d) thunderstorms, without hail that are obscured, embedded, widespread or in squall lines; or
e) thunderstorms, with hail that are obscured, embedded, widespread or in squall lines; or
f) heavy duststorm or heavy sandstorm; or
g) volcanic ash cloud; or
h) pre-eruption volcanic activity or a volcanic eruption.

Note.— Pre-eruption volcanic activity in this context means unusual and/or increasing volcanic activity which could presage a volcanic eruption. In addition, in the case of transonic and supersonic flight:

i) moderate turbulence; or
j) hail; or
k) cumulonimbus clouds.

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