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Which quantity is used to identify a storm track objectively?

  • A.Bandpass filtered variance of geopotential height
  • B.The mean sea level pressure averaged over the whole of the winter season across the region concerned
  • C.The total precipitation
  • D.The number of days on which the surface wind exceeds gale force at coastal stations along the track

Answer: A

Filtering the height field to retain periods of two to six days and mapping the variance isolates the travelling synoptic disturbances from the slower stationary pattern. This gives a clean objective definition. Seasonal mean pressure shows the stationary waves instead, and precipitation and gale frequency are consequences that are influenced by many other factors as well. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.

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