torrential
adj.describing rain or water that falls in a very heavy and fast flow. You use this when the rain is so strong it feels like a flood.
adj.characterised by a heavy, continuous, and violent flow of water, such as rain or a river. Often used to describe weather conditions that cause flooding or significant erosion.
“The city was hit by torrential rains all night.”
“After the storm, the river overflowed its banks due to torrential downpours that lasted for several hours.”
“The region's infrastructure was severely tested by torrential rains that followed a period of extreme drought, highlighting the vulnerability of the local drainage systems to sudden climatic shifts.”
“The torrential rains hit Chiba prefecture, east of Tokyo, triggering landslide warnings and power outages.”
“The torrential rains hit Chiba prefecture, east of Tokyo, on Thursday night, triggering landslide warnings and power outages.”
From torrent + -ial.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.