A persistent low-pressure system remains over the California-Nevada border, leading to cold temperatures and rain in Northern California. The National Weather Service (NWS) reported that this system is accompanied by another low-pressure system from the southern tropics, which will increase winds in the region. Early Wednesday, significant rainfall was observed in Monterey County and the Santa Cruz Mountains, with isolated thunderstorms in Napa County producing half an inch of rain. As the weather system transitions, warmer temperatures are anticipated, potentially reaching 80 degrees in inland areas by Saturday and the mid-80s by Sunday or Monday. However, this warm spell is expected to be short-lived due to the upper-level trough that has characterized the region's weather since April. The Sierra Nevada is also expected to receive rain and snow showers, with accumulations of up to 2 inches of snow possible. As the sub-tropical system moves, hazardous beach and marine conditions may return, prompting advisories from the NWS.