Flooding in California? It's happened before (without Lex Luthor) and back then they didn't say it was caused by "climate change":
---
An Incredible 45-Day Storm Turned California Into A 300-Mile-Long Sea… And It Could Happen Again
Environment
17 February 2016
https://www.sciencealert.com/an-incredible-45-day-storm-turned-california-into-a-300-mile-long-sea-and-it-could-happen-again
For 43 days, from late 1861 to early 1862, it rained almost nonstop in central California. Rivers running down the Sierra Nevada mountains turned into torrents that swept entire towns away. The storm was caused by an atmospheric river, a large concentration of water vapour that can cause devastating storms.
The flooding was so intense that California's 300-mile-long (480-km-long) and 20-mile-wide (32-km-wide) Central Valley turned into a massive inland sea.
On 10 January 1862, the day California's new governor elect, Leland Stanford, was to be inaugurated, a massive flood broke through the levees surrounding Sacramento, covering the city in 10 feet (3 metres) of brown, debris-filled water.
---
Of course, if it happened now Gov. Newsom would blame "CLIMATE CHANGE!"