An early-season storm was lashing Southern California early Tuesday, prompting officials in Los Angeles County to issue evacuation warnings in some areas. Thunderstorms could unleash heavy rain that sends torrents of water, mud, sand, rocks, trees and boulders down steep slopes in places recently burned by wildfires, forecasters warned. … A flash flood watch was in effect through Tuesday afternoon for all areas that burned within the past two years. … A winter weather advisory was issued through Wednesday for the Lake Tahoe Basin, where the highest peaks were predicted to pick up two feet of snow. 

Other weather and water supply news around the West:

• Newsweek: How California water levels will change after 3 feet of snow
• San Francisco Chronicle: Heavy rainfall drenches Bay Area roads as flash flood alerts spread
• Los Angeles Times: Atmospheric river storm slams into Southern California amid evacuation and flood warnings
• Manteca Bulletin (Calif.): ​First rain of weather year disrupts late almond harvest
• Santa Fe New Mexican: Significant weekend flooding in Colorado heightens river levels in New Mexico
• Colorado Public Radio: Flood warnings continue through Wednesday for southwestern Colorado