In what is being predicted as one of the largest storms in the history of Santa Barbara County, California, a powerful atmospheric river storm system is expected to hit the state this weekend, bringing with it life-threatening and damaging flooding, wind, snow, and waves. The National Weather Service has issued flood watches, in effect from Saturday night through Tuesday, for central and southern California.

Rainfall totals between 3 to 6 inches are expected, with the possibility of 6 to 12 inches in south and southwest-facing foothills and mountains. The heaviest rain is forecasted for Sunday and Monday, with up to 1 inch of rain per hour during the peak. Long durations of heavy rainfall, lasting from three to six hours, are anticipated, posing significant risks of flooding in urban areas.

The city of Los Angeles is preparing for the storm, with Mayor Karen Bass urging residents to stay off the roads on Sunday to ensure their safety. Authorities are heavily staffed and are bolstering their air resources to respond promptly to any water-related emergencies.

The storm also presents a threat of extensive rock and mudslide activities on mountain and canyon roadways, which could cause travel delays and road closures. Evacuation orders have been issued in Santa Barbara County due to the high flash flooding risk. Residents are encouraged to evacuate as officials warn that this storm could be one of the most significant in the county's history.

The Ventura County Sheriff's Office has also issued an evacuation order for some residents, with an evacuation warning issued for other parts of the county. The anticipated damaging winds, with gusts between 60-80 mph, are expected to down trees and power lines, leading to widespread power outages and difficult travel conditions.

Furthermore, a high surf advisory is already in effect, with waves potentially reaching up to 20 feet on Sunday. The increased risk of ocean drowning and rip currents has prompted authorities to close state beaches until further notice for public safety.

In addition to the coastal regions, the Sierra Nevada mountain range will also be affected by this storm system, with winter storm warnings in effect from Saturday evening to Tuesday. Heavy snowfall is anticipated, with total accumulations of 2 to 4 feet and even up to 5 to 6 feet at higher mountain peaks.

As the Grammy Awards take place in Los Angeles on Sunday, the heaviest rain from this storm is expected to be centered over the city and its surrounding areas. Flash flooding and damaging winds are likely, with potential delays at Los Angeles International Airport. By Monday morning, the heavy rain is predicted to move towards the San Diego area, posing a risk of flash flooding.

Authorities are urging residents to stay informed about the storm and to follow any evacuation orders or advisories. With the potential for significant damage, it is essential for Californians to prioritize their safety and take necessary precautions during this powerful storm system.