August 20, 2023 Storm Hilary batters California after making landfall in Mexico

By Maureen Chowdhury, Aditi Sangal, Mary Gilbert, Eric Zerkel, Steve Almasy, Matt Meyer and Helen Regan, CNN

Updated 1131 GMT (1931 HKT) August 21, 2023

What we covered

A powerful weather system is moving through southwestern United States, where 25 million people from Southern California northward to northern Idaho are under flood warnings.
The storm has been downgraded to a post-tropical cyclone but "the ongoing and historic amount of rainfall" could still lead to life-threatening and catastrophic flooding, according to the National Hurricane Center.
Schools have been shuttered, flights canceled and evacuation orders for some communities have been issued, as strong winds are expected to persist across portions of the western US on Monday.
Hilary is located about 390 miles north of San Diego, in central Nevada, racing to the north at 29 mph. CNN is tracking the storm's path over the US.
Southern California residents already bracing for a rare summer storm were also struck by a more familiar phenomenon Sunday: a magnitude 5.1 earthquake.
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7:48 a.m. ET, August 20, 2023

Use this checklist to be prepared before and during the storm

From CNN's Christina Maxouris and Doug Criss

Hurricane Hilary headed your way? Don’t panic. There are many steps you can take to protect yourself, your loved ones and your property.

A checklist can help you get started, with tips from the American Red Cross, Federal Emergency Management Agency, the Department of Homeland Security and the National Hurricane Center.

Read it here or download the PDF, which contains links with more details. For anyone in the path of the hurricane, we encourage you to consult these online resources to help stay safe.

Here are some more tips from the National Hurricane Center: