Heavy rain and widespread flooding killed at least seven people, including two people experiencing homelessness, and knocked out power across Central Tennessee over the weekend, with more rain on the way. More than 2.5 million people are under flood warnings through Thursday evening. Global warming increases the amount of moisture that can be held in the air, just as a bigger bucket can dump more water, and thus increases the extreme precipitation that causes flash flooding. Nashville was inundated by its second-highest ever two-day rainfall over the weekend, but could receive another one to two inches of rain just as flood waters have begun to recede. “Normally this amount of rain wouldn’t cause flooding, but because it is so wet there is that possibility,” National Weather Service meteorologist Sam Shamburger told the Tennessean. (CNN, Nashville Tennessean, USA Today, Washington Post $; Climate Signals background: Extreme precipitation increase, Flooding)