The Bay Area is bracing for its first significant rainfall of the season, with a rapidly approaching storm expected to bring heavy rain and possible thunderstorms beginning Monday morning. Residents are advised to prepare for treacherous driving conditions as rainfall can lead to slick roads and a cold snap. Sandbags are being made available for those in vulnerable areas ahead of the rainfall. The upcoming storm is notable, particularly after a sunny weekend, and it is forecasted to potentially impact local events such as Fleet Week. The National Weather Service has issued alerts, urging residents to stay vigilant as the region anticipates the return of fall showers and a dramatic shift in weather.