• Current NWS precipitation forecasts predict higher precipitation amounts of over 10 inches in 3 days over the higher elevations of the Sierra Nevada Mts. with other locations in northern CA receiving 2-10 inches
• Recent heavy precipitation has primed soil conditions and river flows to raise concern for flooding in some locations in northern California, as seen in NWS river forecasts

Landfalling AR to impact California

• A moderate-strength AR is expected to make landfall in north/central California tonight, and could reach “strong” AR level
• The AR propagates southward later in the week bringing AR conditions to portions of southern California

Click IVT or IWV image to see loop of 0-90 hour GFS forecast (Valid 1200 UTC 13 Dec – 0600 17 Dec)