Jacksonville is facing another round of heavy rain, thunderstorm activity, flash flood risk—especially in southern Georgia—and high heat index values, according to News4JAX's latest forecast.

Jacksonville faces a dangerous combination of extreme heat and heavy rain as a heat advisory takes effect and storms are forecast for the area, according to News4JAX's Exact Track 4D Weather Authority.

News4JAX meteorologist Richard Nunn says Jacksonville is in for a shift from scattered showers to widespread rain this week, with a slight chance for tropical development and rising rain totals by Thursday.