Daily Archives: September 14, 2026

The National Weather Service defines rainfall rate as the intensity of liquid precipitation falling over a specific, short duration, typically expressed in inches or millimeters of accumulation per hour.

The American Meteorological Society defines heavy rain as a rainfall rate of 0.30 inches of rain per hour. Rainfall rate measures how hard rain falls at any given moment, while accumulation measures the total depth of water accumulated. Continue reading →