San Francisco is preparing to face challenging weather conditions, with heavy rain and thunderstorms anticipated. The National Weather Service (NWS) has issued alerts regarding a powerful storm system moving towards the area, bringing the potential for heavy rainfall, thunderstorms, strong winds, and lightning. Residents are urged to stay updated with the latest weather forecasts and alerts from the NWS, and to take precautions such as avoiding driving in flooded areas and securing outdoor objects. Local authorities are also preparing for potential flooding and power outages, and emergency response teams are on high alert.