A worker from the Coachella Valley Water Department surveys the debris flow following heavy rains from Tropical Storm Hilary at Thunderbird Country Club in Rancho Mirage, California, on August 21. Photo: David Swanson/AFP via Getty Images

Tens of millions of people faced a massive tropical storm in California and Nevada on Sunday, and the water from what was Hurricane Hilary hasn’t finished affecting the region, even as its status has been downgraded to post-tropical. This part of the country is not one where such weather events typically occur — the previous tropical storm to hit Southern California happened more than eight decades ago — and more heavy rainfall, flooding, and mudslides hit the Southwest on Monday. Below are the latest updates.

This post has been updated throughout.