After an atmospheric river dumped heavy rain and strong winds on parts of Southern California earlier this month, more weather woes were on the way to the region on Nov. 21 with forecasters warning of additional rain and flash flooding.

Two back-to-back low pressure systems are set to impact Southern California and the Desert Southwest on Nov. 21 and 22, the National Weather Service said.

"This heavy precipitation will be falling across areas of southern California and the Southwest that received heavy rains early in the week and this past weekend, posing further risk of flash flooding, especially across burn scar and urbanized regions," the weather service said of the first system.

The second system will come right on the heels of the first, keeping most of the heavy rain over Mexico but creeping up into Arizona and New Mexico by the end of the weekend, the weather service said.

A flood advisory and flash flood warning was in effect in some areas through 6 a.m. PST on Nov. 21, the weather service in Los Angeles said. A flood watch covering a wider area of southwest California was also in effect until 7 a.m.

Last week, the atmospheric river slammed parts of California with days of heavy rain, prompting evacuation orders in parts of Los Angeles County affected by recent wildfires, including the Palisades and Eaton fires in January 2025. Burn scars, areas recently scorched by wildfires, are especially prone to flooding and debris flow. The deaths of at least seven people, including a child, were attributed to the storm, the Palm Springs Desert Sun, part of the USA TODAY Network, reported.

Stormy SoCal weather to dry up before Thanksgiving

The downpours over the next couple days will include a stretch from Los Angeles to San Diego, according to AccuWeather. Rainfall totals through Nov. 22 are expected to total between 0.75 and 1.25 inches in Los Angeles and Ventura counties with more in mountains and hills, the weather service there said.

The storm is expected to sweep eastward and across the country, leaving behind a drier California ahead of the Thanksgiving holiday next week but threatening areas from Texas' Hill Country to Missouri with potential flooding, AccuWeather reported.

"The storm’s end will usher in a dry, calm period lasting through Thanksgiving week, aiding travel and recovery across the state," an AccuWeather report said.

It should be the last storm in a back-to-back series of heavy rains to impact the region before a dry spell that could bring Santa Ana winds, AccuWeather meteorologists said.

Contributing: Thao Nguyen

This article originally appeared on USA TODAY: More heavy rain, flooding risk heads to Southern California

Reporting by Jeanine Santucci, USA TODAY / USA TODAY

USA TODAY Network via Reuters Connect