The National Weather Service (NWS) San Francisco has issued a Coastal Flood Advisory for the Pacific Coast as well as the entire San Francisco Bay, anticipating up to 2.0 feet of inundation in low-lying areas near shorelines and tidal waterways until 2 PM Sunday for the coast, and until 3 PM Monday for the Bay. They warn of likely flooding of lots, parks, and roads, and advise against driving around barricades or through water of unknown depth, as per the NWS website.
Alongside the flood risks, beachgoers are cautioned by a Beach Hazards Statement, effective Sunday until 10 PM. The NWS forecasts large breaking waves reaching up to 20 feet, alongside strong currents and a heightened risk of sneaker waves. For safety, everyone is advised to stay out of the water to avoid hazardous conditions and never turn their back on the ocean.
Entering the crux of the storm, the NWS Area Forecast Discussion updates the public on a chance of thunderstorms today and consistent daily rain showers stretching into Monday. As the low-level shear has decreased below 10 kts, it's unlikely thunderstorms will produce severe wind gusts or tornadoes. Yet, still they caution, "Garden variety thunderstorms still bring hazards, namely lighting strikes, heavy downpours, and small hail." Shower activity is expected to diminish through the evening with the next round on Monday.
For those with their gaze fixed on the longer-term forecast, a brief respite is predicted after Sunday evening, with dry weather on the horizon. The reprieve is forecasted to shift temperatures down with frost expected, especially on Friday morning, as a high-pressure ridge builds. "Many inland areas will be dropping back into the 30s starting Thursday morning," the NWS San Francisco explains, indicating a transition away from the wetness with no significant rains anticipated through the end of next week.
Aviation notices reflect a mixed bag of VFR and MVFR-IFR conditions for today, attributed to the rain reducing visibilities and ceilings. The chance of thunderstorms is also noted here, with potential clearing tonight and early Monday, which, coupled with light winds, may lead to patchy fog of VLIFR-IFR range.
The maritime community isn't spared, as the low-pressure system translates to a continuation of showers and possible thunderstorms today, with breezy to gusty winds. Sea craft operators must note that hazardous swells are currently at 12 to 16 feet but are expected to calm as the week progresses. By late in the week, the cycle repeats, with winds and seas predicted to build again, according to the NWS Marine section.
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