If the observed prevailing visibility is 4 1/4sm, what would be reported on the MF1M-10C?

In a Limited Aviation Weather Reporting System (LAWRS) context, prevailing visibility reporting follows established formatting rules. When the observed prevailing visibility is 4 1/4 statute miles (sm), it is important to adhere to the reporting standards, which often round visibility to the nearest whole or quarter mile for consistency and clarity in communication.

The correct reporting format typically limits visibility to a maximum of the nearest whole mile. In this scenario, the prevailing visibility of 4 1/4 sm rounds down to the nearest whole mile, which is 4 sm. This rounded value provides a clear and standardized measurement that is easily interpreted by aviation personnel.

The other options suggest either a more precise measurement of visibility that does not align with the reporting standards expected on the MF1M-10C form or a simplified rounding that does not adhere to the limitations or guidelines for reporting in aviation contexts. Therefore, 4 sm is the appropriate value to report based on the prevailing visibility of 4 1/4 sm.