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Which practical value does stratospheric prediction have?

  • A.It replaces tropospheric forecasting entirely during the winter months in the northern hemisphere region
  • B.It extends useful surface forecast skill to several weeks
  • C.It allows the exact date of a sudden warming to be predicted many months in advance of its occurrence
  • D.It has no practical value

Answer: B

Because the stratospheric influence on the surface persists for several weeks after a major warming, forecasting the stratospheric state adds skill in the two to six week range where tropospheric memory has been lost. This is now exploited operationally at several centres. The onset of a warming is itself predictable only a week or two ahead, so long lead prediction of the event is not available.

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