The Bay Area braces for a tumultuous weather week, with the National Weather Service San Francisco (NWS) forecasting continued wet conditions and growing flood concerns, particularly in the North Bay. According to a Sunday announcement by the NWS, the region should anticipate moderate to heavy rain starting Monday and extending through Tuesday. Flood Watches and Advisories are already in place, highlighting the ongoing threat posed by the additional downpours expected to saturate the ground.

Numbers released by the NWS illustrate the depth of the deluge. Sonoma County's Mount Tamalpais received over 6 inches in the last 48 hours. Meanwhile, most of the Bay Area ranged between half an inch to an inch, while the Central Coast registered under a quarter of an inch of rain. The National Weather Service bulletin signals lighter rain for today and a significant ramp-up in rainfall as the week progresses. Even as the main moisture plume shifts northward, heavier rain is poised to drench Sonoma and Napa counties, with the rest of the Bay Area expecting lighter showers.

On top of the flood hazards, the potential ramification of this deluge includes the threat of saturated soils and increased runoff, leading to possible street and low-lying area flooding and the rising of streams and creeks. These concerns will intensify in the next round of moderate to heavy rain forecasted Monday through Tuesday. The NWS advisory cautions that "Flooding concerns are increasing, particularly across the North Bay, Sunday into next week," and that gusty winds combined with soaked soils might result in trees being toppled, further complicating conditions.

In marine forecasts, navigators are warned of persistent gusty south winds and variable conditions caused by a merging subtropical air mass and a cold front from the north that's set to intensify early in the week, bringing heavy rain and a transition to northwest winds. The NWS issued the marine advisory at 346 AM PST, emphasizing moderate to rough wave conditions through Friday. As for hydrology, the NWS confirms an elevated risk for quick rises in Bay Area rivers, with some North Bay rivers' rising above flood thresholds being a tangible concern. The atmospheric river responsible is set to deposit substantial rainfall, priming soils for more quick and significant rises in creeks and streams with the coming rains.