El Niño is a weather phenomenon that occurs when ocean temperatures in the equatorial Pacific are warmer than average.
This can lead to changes in global weather patterns, including increased precipitation in some areas and drought in others.
El Niño is expected to strengthen this winter, which could mean more rain and snow for Northern California.
This could be good news for the region, which has been experiencing drought conditions in recent years.
However, it could also lead to flooding and other weather-related hazards.
It's important for residents and businesses in Northern California to be prepared for the potential impacts of El Niño.
This includes taking steps to protect property and infrastructure, as well as being aware of weather forecasts and emergency alerts.