Milwaukee is preparing for a weekend of rain and thunderstorms as a low-pressure system approaches the region. The National Weather Service forecasts increased moisture and atmospheric instability, leading to scattered thunderstorms from Friday evening through Sunday. Rainfall amounts may vary, with some areas receiving up to an inch of rain. Thunderstorms could bring gusty winds and occasional lightning, posing risks to outdoor activities. Residents are advised to stay updated on weather conditions and modify their weekend plans accordingly.