Practice question

Under ICAO Annex 3 meteorology SARPs, under what specific operational circumstances is a Special Meteorological Report (SPECI) issued?

  1. At mandatory fixed 30-minute intervals throughout the operational day
  2. When significant changes in weather parameters (e.g. visibility, ceiling, wind shift, thunderstorm) occur between routine METAR reports
  3. Only when an aircraft declares a MAYDAY emergency on frequency
  4. Whenever the airport QNH shifts by exactly 0.1 hPa

Answer: B — When significant changes in weather parameters (e.g. visibility, ceiling, wind shift, thunderstorm) occur between routine METAR reports

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