"(Richard Vogel / Associated Press) An atmospheric river storm should bring rain - heavy at times - to Southern California beginning Thursday night through the weekend. Under the storm scenario deemed most likely by forecasters, downtown Los Angeles would see 2.62 inches of rain Friday morning through Sunday. Key warnings Evacuation warnings are in effect from 6 p.m. Thursday through 11 a.m. Sunday in areas near recent burn scars, due to the risk of mud and debris flows."
"An intense rain (typically about half an inch per hour - like a thunderstorm) on a recently burned slope can trigger a debris flow. Just a few minutes of intense rain can start a debris flow. The National Weather Service will issue a flash flood watch or warning for your area when rainfall is anticipated to be intense. Note that it's the rain in the mountains that will start the debris flow, even if it's not raining - or only sprinkling - where you live."
An atmospheric river will bring heavy rain to Southern California beginning Thursday night and continuing through the weekend. Downtown Los Angeles could receive about 2.62 inches of rain from Friday morning through Sunday under the most likely forecast scenario. Evacuation warnings run from 6 p.m. Thursday through 11 a.m. Sunday for areas near recent burn scars, including zones affected by the Palisades, Eaton, Kenneth, Sunset and Hurst fires. Topanga Canyon Boulevard between Pacific Coast Highway and Grand View Drive will close at 10 p.m. Thursday and may remain closed through the Friday commute and the weekend. Intense mountain rainfall can trigger rapid debris flows; a few minutes of heavy rain can start one.
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