Residents in South Florida should prepare for localized showers and thunderstorms, which may lead to minor flooding in some areas. The high heat index exceeding 100 °F (37.8 °C) poses a risk of heat-related illnesses, particularly for vulnerable populations such as the elderly and those with pre-existing health conditions. Outdoor activities may be disrupted, and drivers should exercise caution on wet roads during the storms. (Source: CBS News)