Communities in sensitive regions, particularly those near recent wildfire scars, are taking proactive measures ahead of an approaching storm system set to impact Southern California.
Timing and Intensity Concerns
Rainfall is anticipated to begin on Tuesday, with the most severe conditions developing late Tuesday night and continuing into Wednesday. The primary worry is the rate of precipitation, which could lead to street flooding, overwhelmed drainage systems, and possible mud or debris flows, especially in hilly terrain and areas affected by recent fires.
Forecasters emphasize that while total rainfall amounts are significant, the speed at which the rain falls poses an even greater threat.
Extended Weather Pattern
An atmospheric river will deliver substantial moisture to the region, making it one of the wettest areas globally during the Christmas period. Even after the peak midweek activity, showers are expected to persist, potentially lasting through Christmas Day and beyond. This prolonged wet period increases risks of saturated soil, standing water, and rapidly changing conditions.
Emergency officials strongly advise residents not to delay preparations until rainfall begins.
Specific Risks and Preparedness
Those living near slopes, burn zones, or flood-prone streets should immediately obtain sandbags, clear drainage paths, and assess water flow patterns around their properties.
National Weather Service forecasters warn that the most intense storm activity may occur overnight, making advance preparation crucial.
"There is a high risk of rock and mudslides through those canyon roads, but any canyon mountain, any roadway can see flooding," said Kristan Lund, a meteorologist with the NWS. "We're looking at widespread strong winds Tuesday into Wednesday, with downed trees and power outages possible."
Sandbag distribution has already commenced in fire-affected communities to assist with flood mitigation efforts.
