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An “atmospheric river” continued to batter parts of Northern California on Tuesday, causing widespread flooding. The heavy rains prompted the National Weather Service to warn of a dam failure outside Carson City, Nev., saying that it was “not a drill” and that residents should “move to higher ground now.” But less than 90 minutes after issuing the alert, the agency changed its report to say the retention basin in Dayton, Nev., had not failed. Instead, it was full and overflowing into drainage areas, the weather service said.

Waterlogged Northern California will get more heavy rainfall into Wednesday, renewing fears about flooding in the region. The new onslaught of rain comes as Southern California dries out following downpours that left five people dead. A flood warning is in effect for Northern California’s interior counties through Thursday. Storms started overnight Saturday, with two to four inches of rain expected by Wednesday, CNN meteorologist Allison Chinchar said. Some areas may get up to 10 inches and the driving rain could drastically reduce visibility, Chinchar warned.

California is not the only place in the West confronting startling amounts of rain and snow. Drought conditions have declined substantially across the region in recent weeks, with heavy storms replenishing reservoirs and piling fresh powder on ski resorts. Yet there is one place where the precipitation has been particularly welcome and could be transformative: the Colorado River basin, which provides water to nearly 40 million people across seven states.

Snowpack and reservoir levels continued to increase in California, marking another week of improvement for drought conditions across the state. Last week, 47 percent of the state was in drought, but that figure plummeted to 24 percent this week, according to the Drought Monitor report issued Thursday. At this time last year, 94 percent of California was in drought.

 

Jeffrey Mount, a leading expert on California water policy, remembers the last time a crisis at the Oroville Dam seemed likely to prompt reform. It was 1997 and the lake risked overflowing, while levees further downstream failed and several people died. “If this doesn’t galvanize action, I don’t know what will,” Mount said he thought at the time. But spring came, the waters receded and no changes came to pass.