Instrument Rating Checkride Practice Test

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What does 'BECMG' signify in a TAF report?

A rapid change occurring within 1 hour
A gradual change taking place over the course of 1 hour
Temporary weather conditions
A high probability of forecasted weather

The correct answer is: A gradual change taking place over the course of 1 hour

In a TAF (Terminal Aerodrome Forecast) report, "BECMG" indicates that a gradual change in weather conditions is expected to occur over a specified duration, typically within a time frame of 2 hours or less. This term is vital for pilots because it informs them that the current weather will transition to a different state, allowing for adequate preparation for the expected conditions. For example, if a TAF states that conditions will "BECMG" from VFR to marginal VFR, pilots need to be aware that the transition is not abrupt but rather a gradual change they will have time to respond to. This contrasts with the other options, which might suggest different meanings that do not accurately represent the specific terminology used in TAF reports. Understanding these terms is crucial for flight planning and safety, particularly in instrument conditions where visibility and other weather factors are critical for navigation and approach strategies.