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Medium range forecast is valid for :

  • A.3 to 5 weeks
  • B.4 to 6 weeks
  • C.3 days to about 2 weeks
  • D.about 2 weeks to about 3 weeks

Answer: C

A medium range forecast is valid for 3 days to about 2 weeks.

Weather forecasts are classed by lead time. Short range covers up to about 3 days. Medium range covers from about 3 days to around 10 days, up to two weeks in some usages, the period for which numerical weather prediction still has useful skill in day-to-day weather. Extended range covers from about 2 weeks to a month, and long range covers a month to a season.

3 to 5 weeks and 4 to 6 weeks are extended or long range. About 2 to 3 weeks is the extended-range (sub-seasonal) window, not medium range.

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