What is the classification for heavy rain when the rate-of-fall exceeds certain limits?

Heavy rain is classified based on the rate at which precipitation falls, specifically when it exceeds certain thresholds. The classification standard recognizes that when rain falls at a rate of more than 0.30 inch per hour, it qualifies as heavy rain. This level of intensity can lead to significant water accumulation and increases the risk of flooding, particularly in areas with poor drainage.

Understanding the context of the rates helps clarify why the other thresholds do not meet the criteria for heavy rain. For instance, other options reference rates that are either lower than the established threshold for heavy rain or pertain to different time frames (like per 6 minutes or per hour) that do not meet the cumulative standard for being officially classified as heavy rain. Thus, recognizing that a rate exceeding 0.30 inch per hour is crucial for categorizing rainfall intensity accurately and understanding potential impacts on environments and operations.