"Intense rainfall" refers to a heavy and heavy downpour of rain that falls very strongly and quickly for a relatively short period of time. Full definition
According to him, in the past 30 years — with a couple of exceptions — we've had mostly mild winters, and we're seeing more intense rainfall events. (news.stlpublicradio.org)
So to, are the more intense rainfall events likely to result from climate change — and note that these can occur in the same places as droughts. (realclimate.org)
The fact remains that there is 4 percent more water vapor — and associated additional moist energy — available both to power individual storms and to produce intense rainfall from them. (globalwarming.org)