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Weather servicesQuestion 377 of 934

What does PROB30 mean in a TAF?

  1. A 30 percent chance of the stated condition
  2. A change is expected to begin in 30 minutes
  3. The forecast is valid for a period of 30 hours
  4. Visibility is forecast to be 30 statute miles
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Correct answer: A 30 percent chance of the stated condition

A PROB group gives a probability of 30 or 40 percent.

Source: Aeronautical Information Manual (FAA, Basic with Change 3, 9 July 2026), AIM 7-1-28 Key to TAF and METAR, page 582

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Questions last reviewed: 18 October 2026