A potent winter storm, fueled by a significant atmospheric river, is forecast to drench Southern California this week, threatening to disrupt Christmas travel and outdoor celebrations with heavy rain, strong winds, and possible flooding.
The National Weather Service (NWS) has issued warnings for a major shift in conditions, with the system expected to arrive mid-week. The heaviest precipitation and strongest winds are currently predicted for Wednesday and Thursday.
Authorities warned that though initial rains may be light, the system has the potential to bring significant rainfall to coastal areas, valleys, and mountains. This increases risks for flash flooding, runoff, and localized inundation. The forecast also reveals moderate to strong winds across the region, which may reduce visibility and create hazardous driving conditions, particularly in desert and elevated areas.

Key Recommendations
- Rely on official sources like the National Weather Service for the latest updates.
- Never walk or drive through floodwaters or moving currents.
- Drive with extreme caution, Rain and wind can severely reduce visibility and create slippery roads.
- Stay away from mountainous regions or areas prone to landslides during heavy rainfall.
- Before traveling, check weather and traffic reports and plan for potential delays.
- Secure or bring indoors any loose outdoor items that high winds could displace.
- Postpone all outdoor activities during heavy rain or strong winds.
- Stay in a safe location and follow all instructions from local authorities.