If a wind shift is accompanied by a cold frontal passage that began at 30 minutes after the hour, how would it be coded?

The correct answer is coded as "WSHFT 30 FROPA." This coding indicates a wind shift that occurred due to the passage of a cold front.

In weather reporting, wind shifts related to cold fronts are often documented to provide pilots and meteorologists with critical information about changing conditions. The coding starts with "WSHFT," which is an abbreviation for wind shift. This alerts the observer to significant changes in wind direction that can affect flight operations.

The "30" following the wind shift refers to the fact that this change occurred 30 minutes past the hour. The addition of "FROPA" afterward signifies that the wind shift is associated with the front's passage, indicating that the wind change is a direct result of the cold front moving through the area.

Other options, while they may contain relevant elements, do not organize the information in the same way. The placement of "WSHFT" at the beginning effectively conveys that the primary observation here is the wind shift itself, and the inclusion of "FROPA" solidifies the context related to the cold front.