VIDEO: Watch your AccuWeather forecast
An Atmospheric River, or "AR", event is a narrow band of heavy rain less than 200 miles wide, which brings significant rainfall to an area.
Later this week it looks like this AR will have it's sight set on Southern California. There is high concern for Debris Flows in that region, especially over the Thomas Fire burn scar in Ventura and Santa Barbara county. Not only rain but significant snow is coming to the Sierra where feet of fresh powder will arrive by the end of the week.
Click here to download the free ABC7 News App to track the storm where you live. Make sure you enable push alerts for immediate notifications and severe weather alerts.
Click here for weather where you live.
VIDEO: Tips for how to drive safely on rainy days
How to stay safe on the road on rainy days