The watch is valid from Tuesday 10 a.m. until Friday Dec. 26, at 10 p.m. According to the NWS San Francisco CA, Flooding caused by excessive rainfall continues to be possible. Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Creeks and streams may rise out of their banks. Flooding may occur in poor drainage and urban areas, according to the NWS.
A cataclysmic storm rolled into San Bernardino County on Thursday, trapping highway drivers in mudslides and triggering rescue operations throughout the area, including an ongoing search for a 2-year-old boy. The National Weather Service issued its first flash flood warning for the San Bernardino Mountains, which includes towns like Oak Glen and Lake Arrowhead, at 2:13 p.m. and lasted until 8 p.m., meteorologist Ashley Nickerson told SFGATE.