For precipitation, "in the vicinity" is defined as what distance from the usual point of observation?

The definition of "in the vicinity" in relation to precipitation is characterized as a distance that extends from just beyond the usual point of observation out to 10 statute miles. This means that the term encompasses regions beyond the immediate area, allowing for a buffer zone where precipitation may still be relevant to reporting and observation.

This broader range up to 10 statute miles helps to provide a comprehensive representation of weather patterns that may influence or affect aviation operations near the observation point. Recognizing precipitation within this context enables pilots, meteorologists, and decision-makers to better assess conditions that could impact flight safety in the vicinity.

In contrast, the other choices either suggest a more limited range of 5 statute miles, incorrectly constrain the definitions of occurrence, or propose distances that are considered too extensive or outside the practical range for aviation weather reporting.