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.

The National Weather Service on Friday issued several flash flood warnings in parts of the Bay Area as heavy rain saturated the region.

A powerful atmospheric river storm that drenched the North Bay for two days in a row and set rainfall records moved south Friday, bringing steady rain starting around mid-day that was expected to soak the entire Bay Area until Saturday morning.

Nov. 22, 5 p.m. A flash flood alert in San Francisco has been downgraded to a flood warning as the intense downpour from a California atmospheric river slows down in the city but continues to pummel other parts of the Bay Area. San Francisco’s flood warning is in effect until 6:45 p.m., the National Weather Service said in a social media post.

The first notable atmospheric river of the season is due to impact Northern California this week and could bring heavy rain and flood risk to the Bay Area, according to the National Weather Service. The weather system is due to arrive mid-week with the heaviest impact expected in the North Bay.

The Bay Area had a chance to dry off a bit this weekend after the past few days' deluge. After some high rain totals, some communities are cleaning up flooding, and others are preparing for the next wave of the storm.