South Florida residents can expect another hot and humid day Sunday, with triple-digit heat index values developing across much of Miami-Dade and Broward counties before scattered afternoon and evening storms bring the threat of heavy rainfall and localized flooding.
High humidity levels, ranging from the mid-70% range in Miami and Fort Lauderdale to more than 80% in Homestead, will combine with temperatures near 90 degrees to make it feel significantly hotter. Heat index values are expected to reach 100 to 102 degrees across inland portions of both counties, including Plantation, Davie, Miramar, Lauderhill, Doral and Miami Lakes. Coastal areas such as Miami Beach, Aventura and Fort Lauderdale are expected to feel closer to the upper 90s.
Rain chances will remain low through midday before increasing during the afternoon. Forecasts call for a 20% chance of storms by 2 p.m., rising to 50% by 4 p.m. and remaining elevated through the early evening hours. Temperatures are expected to peak near 90 degrees before falling into the mid-80s after sunset.
Tropical moisture moving into the region will interact with daytime heating to produce scattered thunderstorms, some of which could become strong and generate isolated heavy downpours. The greatest threat is expected during the late afternoon and early evening…