CPAER Canada Commercial Pilot Practice Exam

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What does the PROB40 group in a TAF signify?

A high chance of severe weather

A chance of thunderstorms or precipitation in the 30% to less than 50% range

The PROB40 group in a TAF (Terminal Aerodrome Forecast) signifies a chance of thunderstorms or precipitation in the 30% to less than 50% range. This indicates that there is a reasonable likelihood of encountering these weather phenomena within the forecast period, providing pilots with crucial information for flight planning and safety.

The use of the PROB group in TAFs helps differentiate between weather conditions that are likely to occur and those that are merely possible. Since PROB40 indicates a percentage chance of occurrence, it is essential for pilots to factor this into their operational decisions, especially when planning for possible turbulence, delays, or alterations in flight routes due to adverse weather. Understanding this classification allows pilots to prepare adequately for potential weather impacts during their flight operation.

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Weather conditions guaranteed to worsen

Changes in wind speed only

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