The primary risks associated with today's weather in Miami include heavy rainfall and thunderstorms, which could lead to localized flooding and ponding on roadways. These conditions may cause travel disruptions and hazardous driving conditions, particularly during the afternoon when thunderstorms are most likely. Residents and visitors should be cautious of slippery roads and reduced visibility. Outdoor activities may be impacted by the wet and stormy weather, and those planning to be outside should prepare for sudden downpours and potential lightning.