Why is it raining so hard? Global warming is delivering heavier downpours

Yale Climate Connection

When it rains, it pours.

Today’s rainstorms give new meaning to this age-old expression.

Extreme precipitation has increased in nearly every region of the mainland United States since the start of the 20th century, according to the Fourth National Climate Assessment, a comprehensive scientific report about climate change in the U.S.

The Southwest is the only region experiencing a decrease in heavy precipitation events. But even there, the intensity of rainfall during the region’s monsoon season has increased since the 1960s, according to a study in the peer-reviewed journal Geophysical Research Letters.

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