What does PROB30 indicate in a TAF?

In a Terminal Aerodrome Forecast (TAF), the notation PROB30 signifies a 30% probability of a particular weather event occurring during a specified time frame. Specifically, this refers to a 30% chance of significant weather phenomena such as precipitation or thunderstorms. It's used by meteorologists to convey the likelihood of adverse weather conditions that could affect aviation operations, allowing pilots and flight planners to better prepare for potential weather-related impacts.

While the other options may reflect various weather conditions, they do not accurately define the specific implications of PROB30 in a TAF, which is focused on precipitation or thunderstorms. Understanding such probabilities is crucial for safe and effective flight operations, as this statistic assists flight crews in making informed decisions.