Hurricane Hilary formed as a tropical depression on August 14, 2023, off the coast of Central America and intensified into a Category 4 hurricane on August 18, 2023, with maximum sustained winds of 150 mph
The hurricane moved northwestward along the Pacific coast of Mexico, bringing heavy rain, strong winds, and high waves to the states of Guerrero, Michoacán, Colima, Jalisco, and Nayarit
The hurricane weakened as it approached the Baja California Peninsula, where it made landfall as a Category 1 hurricane on August 19, 2023, near Cabo San Lucas
The hurricane caused widespread damage and flooding in Baja California Sur, affecting more than 100,000 people and leaving at least 10 dead and dozens missing
The hurricane continued to weaken as it moved over the Gulf of California and crossed into the southwestern United States as a tropical storm on August 20, 2023
The National Hurricane Center issued the first ever tropical storm watch for southern California, warning of possible flash floods, mudslides, power outages, and coastal erosion in the region
The tropical storm brought rare August rainfall to Los Angeles, San Diego, Phoenix, Las Vegas, Salt Lake City, and other cities in California, Arizona, Nevada, Utah, and Colorado.