Amid the relentless rain brought by an atmospheric river soaking Northern California, a flash flood warning was issued Friday afternoon for San Francisco and parts of San Mateo County where instances of flooding deemed "life-threatening" were occurring.

A lingering atmospheric river is expected to fuel downpours that could produce flooding in San Francisco and across the Bay Area on Friday. The National Weather Service issued a flash flood warning for San Francisco on Friday,

Two people were found dead in Northern California flood waters amid an atmospheric river that dumped a record amount of rain, causing rivers and creeks to overflow and creating hazardous conditions on roads,