The National Weather Service issued a Flash Flood Warning for parts of Los Angeles and Ventura counties on Sunday afternoon due to heavy rainfall from a summer storm. The warning, which was in effect until 9:30 p.m., cautioned of potential rainfall rates of up to 1.75 inches per hour. Areas like Eastern Lockwood Valley, Alamo Mountain, and the Grapevine were particularly vulnerable. A heat advisory is also in effect for Southern California’s desert communities, where triple-digit temperatures are expected.