Even today, as California struggles with severe drought, global warming has doubled the likelihood that weather conditions will unleash a deluge as devastating as the Great Flood of 1862, according to a UCLA study released Friday. In that inundation 160 years ago, 30 consecutive days of rain triggered monster flooding that roared across much of the state and changed the course of the Los Angeles River, relocating its mouth from Venice to Long Beach. If a similar storm were to happen today, the study says, up to 10 million people would be displaced, major interstate freeways such as Interstates 5 and 80 would be shut down for months, and population centers including Stockton, Fresno and parts of Los Angeles would be submerged — a $1-trillion disaster larger than any in world history.

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• San Francisco Chronicle: Catastrophic floods may occur far more than ever before. Here’s how bad it could get in the Bay Area
• Capital Public Radio: A cataclysmic flood is coming for California. Climate change makes it more likely.
• CNN Wire Service: Parts of California could become a ‘vast inland sea’ due to megafloods, study shows
• Washington Post: A ‘megaflood’ in California could drop 100 inches of rain, scientists warn
• Weather West: ARkStorm 2.0: Climate change is increasing the risk of a California megaflood
• Courthouse News Service: If not by drought then by megaflood: Climate change may have doubled risk of disastrous flooding in California
• New York Times: The Coming California Megastorm 
• Daily Democrat: Woodland Emergency OperationsCenter to participate in flood exercise