At what time is the snow depth entered in column 61 of MF1M-10 measured?

The correct answer is linked to the standard reporting practices for weather observations. Snow depth is typically measured at a specific universal coordinated time to ensure consistency and accuracy across different observations. In this case, the snow depth is recorded in column 61 of the MF1M-10 form at 1200 UTC. This timing aligns with the observations made in conjunction with synoptic weather reporting, which occurs around the same time and allows for a standardized collection of data.

Using 1200 UTC facilitates comparisons between various locations, as it represents a consistent time frame that can be utilized by meteorologists and aviation professionals worldwide. This consistency improves data reliability and communication concerning weather conditions, which is vital for flight operations and safety considerations.

The other choices reflect times or concepts that do not align with standard meteorological reporting conventions, which emphasize the importance of using a uniform time (like UTC) for measuring and reporting weather phenomena.