Northern California experienced severe flooding on Saturday due to a combination of heavy rainfall and record-breaking "King Tides," described as the most severe in two decades. This "perfect storm" led to significant inundation in areas like Marin County, causing road closures and requiring rescues for residents trapped in vehicles submerged in up to four feet of water. Authorities advised residents to stay home as flood warnings and advisories remained in effect for the San Francisco Bay Area through Sunday.