Recent extreme weather incidents are examples of human-caused climate change supercharging extreme rainfall events which are are likely to become more common as long as the planet continues to get hotter.
"The reason is based on a physics principle known as the Clausius-Clapeyron relationship, which relates temperature, pressure and water vapor. The principle shows that warmer air can hold more water vapor -- about 7% more water vapor per 1 degree Celsius. More water vapor in the atmosphere means more moisture available to fall as rain, which leads to higher rainfall rates."
On average, the planet has already warmed more than 1 degree Celsius since pre-industrial times, according to a major UN climate change report published earlier this month. Over land areas there has been even more warming, and particularly in the Eastern US, which has led to a noticeable increase in heavy downpours that lead to flash flooding, according to the most recent National Climate Assessment." Source
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