INRAT Instrument Rating · Question
When interpreting a TAF for CYYZ, the forecast 'PROB30 1820 TX10Z 18005KT 5SM -RA OVC008' indicates what within the specified time period?
'PROB30' indicates a 30% probability, and 'TX10Z' implies a temporary forecast for the duration of the 10 hour period starting at 1820Z, but in the context of T
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Question: When interpreting a TAF for CYYZ, the forecast 'PROB30 1820 TX10Z 18005KT 5SM -RA OVC008' indicates what within the specified time period?
Answer options:
- A 30% probability of rain with ceilings of 800 feet AGL and visibility 5 statute miles, prevailing for one hour. ✅ A 30% probability of rain with ceilings of 800 feet AGL and visibility 5 statute miles, lasting for two hours.
- A 30% probability of rain with overcast at 800 feet AGL and visibility 5 statute miles, occurring at 1800 UTC.
- A 30% probability of a temporary conditions including rain, overcast at 800 feet AGL, and visibility 5 statute miles.
Correct answer: A 30% probability of rain with ceilings of 800 feet AGL and visibility 5 statute miles, lasting for two hours.
Explanation: 'PROB30' indicates a 30% probability, and 'TX10Z' implies a temporary forecast for the duration of the 10 hour period starting at 1820Z, but in the context of TAF format, it represents a period within the validity, not a specific time. In this format, 'PROB' forecasts apply for a maximum duration of two hours.
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Question explanations
- When flying an NDB approach, what instrument is primarily used to track the inbound course?
- How does an aneroid barometer in an altimeter respond to a change in atmospheric pressure?
- What is the primary characteristic that differentiates a Localizer Performance (LP) approach from a Localizer
- When interpreting a TAF (Terminal Aerodrome Forecast), what does 'PROB30' indicate?
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