Marginal weather evaluation requires evaluating which elements?

• A. Destination visibility at minimums and alternate visibility and ceiling at minimums
• B. Destination altitude and wind
• C. Destination temperature
• D. Alternate visibility only

Answer: (A)

Marginal weather evaluation centers on comparing forecast weather to the published landing minimums for both the destination and an alternate. The crucial data are the visibility and the cloud ceiling tied to the approach you plan. You check the destination to see if the forecasted visibility meets or exceeds the destination’s minimums for the intended approach at the estimated time of arrival. You also verify the alternate by ensuring its forecasted weather meets its minimums, specifically the required visibility and ceiling, at the ETA (or the time you’d be landing there). If either the destination or the alternate falls below their minimums, the flight planning becomes unsafe or noncompliant, which is why this evaluation focuses on destination visibility at minimums and alternate visibility and ceiling at minimums. Other factors like wind, temperature, or altitude are relevant to performance and comfort, but they are not the elements assessed in this specific marginal weather evaluation.